30
   

Quake activity along the San Andreas fault is picking up

 
 
Butrflynet
 
  1  
Reply Tue 14 Jun, 2011 03:45 pm
http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/special/California_Nevada.gif

Magnitude 3.7 - NORTHERN CALIFORNIA
2011 June 14 12:20:47 UTC

Earthquake Details

This is a computer-generated message -- this event has not yet been reviewed by a seismologist.

Magnitude 3.7
Date-Time

Tuesday, June 14, 2011 at 12:20:47 UTC
Tuesday, June 14, 2011 at 05:20:47 AM at epicenter
Time of Earthquake in other Time Zones

Location 40.279°N, 124.359°W
Depth 17.6 km (10.9 miles)
Region NORTHERN CALIFORNIA
Distances

8 km (5 miles) SW (231°) from Petrolia, CA
33 km (20 miles) SW (221°) from Rio Dell, CA
34 km (21 miles) SSW (194°) from Ferndale, CA
59 km (37 miles) SSW (196°) from Eureka, CA
314 km (195 miles) NW (309°) from Sacramento, CA

-----------------------------------
Magnitude 3.1 - SAN FRANCISCO BAY AREA, CALIFORNIA
2011 June 14 11:51:05 UTC


Earthquake Details

This event has been reviewed by a seismologist.

Magnitude 3.1
Date-Time

Tuesday, June 14, 2011 at 11:51:05 UTC
Tuesday, June 14, 2011 at 04:51:05 AM at epicenter
Time of Earthquake in other Time Zones

Location 37.375°N, 121.731°W
Depth 8.9 km (5.5 miles)
Region SAN FRANCISCO BAY AREA, CALIFORNIA
Distances

8 km (5 miles) E (84°) from Alum Rock, CA
15 km (9 miles) ENE (75°) from San Jose City Hall, CA
16 km (10 miles) ESE (115°) from Milpitas, CA
---------------------------------
Magnitude 3.3 - CENTRAL CALIFORNIA
2011 June 14 19:05:28 UTC

Earthquake Details

This is a computer-generated message -- this event has not yet been reviewed by a seismologist.

Magnitude 3.3
Date-Time

Tuesday, June 14, 2011 at 19:05:28 UTC
Tuesday, June 14, 2011 at 12:05:28 PM at epicenter
Time of Earthquake in other Time Zones

Location 36.669°N, 121.293°W
Depth 6 km (3.7 miles)
Region CENTRAL CALIFORNIA
Distances

14 km (8 miles) S (170°) from Tres Pinos, CA
20 km (13 miles) NW (319°) from Pinnacles, CA
22 km (14 miles) NE (37°) from Gonzales, CA
22 km (14 miles) SSE (154°) from Hollister, CA
92 km (57 miles) SE (144°) from San Jose City Hall, CA
Butrflynet
 
  1  
Reply Fri 17 Jun, 2011 03:58 pm
Magnitude 3.6 - NORTHERN YUKON TERRITORY, CANADA
2011 June 17 20:15:10 UTC

Earthquake Details

This event has been reviewed by a seismologist.

Magnitude 3.6
Date-Time

Friday, June 17, 2011 at 20:15:10 UTC
Friday, June 17, 2011 at 01:15:10 PM at epicenter
Time of Earthquake in other Time Zones

Location 66.177°N, 135.196°W
Depth 23.9 km (14.9 miles)
Region NORTHERN YUKON TERRITORY, CANADA
Distances

314 km (195 miles) ENE (58°) from Eagle Village, AK
317 km (197 miles) ENE (58°) from Eagle, AK
383 km (238 miles) E (94°) from Chalkyitsik, AK
595 km (370 miles) ENE (70°) from Fairbanks, AK

----------------------------------
Magnitude 4.9 - QUEEN CHARLOTTE ISLANDS REGION
2011 June 17 02:22:25 UTC

Earthquake Details

This event has been reviewed by a seismologist.

Magnitude 4.9
Date-Time

Friday, June 17, 2011 at 02:22:25 UTC
Thursday, June 16, 2011 at 07:22:25 PM at epicenter
Time of Earthquake in other Time Zones

Location 51.937°N, 131.290°W
Depth 20.2 km (12.6 miles)
Region QUEEN CHARLOTTE ISLANDS REGION
Distances 216 km (134 miles) W of Bella Bella, British Columbia, Canada
237 km (147 miles) SSE of Masset, British Columbia, Canada
650 km (403 miles) WNW of Vancouver, British Columbia, Canada
687 km (426 miles) NW of VICTORIA, British Columbia, Canada

http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/region/N_America.gif
Butrflynet
 
  1  
Reply Fri 17 Jun, 2011 03:59 pm
@Butrflynet,
http://www.pnsn.org/recenteqs/index_map.gif
0 Replies
 
Butrflynet
 
  1  
Reply Sat 18 Jun, 2011 12:43 am
@Butrflynet,
The San Andreas in the Cascadea area is experiencing a heightened period of activity this week.

4.2 Mb - OFF COAST OF NORTHERN CALIFORNIA
Preliminary Earthquake Report
Magnitude 4.2 Mb
Date-Time

17 Jun 2011 02:41:16 UTC
16 Jun 2011 18:41:16 near epicenter
16 Jun 2011 20:41:16 standard time in your timezone

Location 41.882N 126.782W
Depth 10 km
Distances

204 km (126 miles) WSW (254 degrees) of Gold Beach, OR
207 km (129 miles) W (265 degrees) of Brookings, OR
210 km (130 miles) W (266 degrees) of Harbor, OR
214 km (133 miles) W (275 degrees) of Crescent City, CA
524 km (326 miles) SW (221 degrees) of Portland, OR
0 Replies
 
Butrflynet
 
  1  
Reply Tue 21 Jun, 2011 11:54 am
3.8 Mb - OFF COAST OF OREGON
Preliminary Earthquake Report
Magnitude 3.8 Mb
Date-Time

21 Jun 2011 14:04:17 UTC
21 Jun 2011 05:04:17 near epicenter
21 Jun 2011 08:04:17 standard time in your timezone

Location 44.180N 128.787W
Depth 10 km
Distances

371 km (231 miles) WNW (286 degrees) of Barview, OR
371 km (231 miles) WNW (290 degrees) of Bandon, OR
373 km (232 miles) W (269 degrees) of Yachats, OR
453 km (282 miles) W (274 degrees) of Eugene, OR
507 km (315 miles) WSW (255 degrees) of Portland, OR
0 Replies
 
Butrflynet
 
  1  
Reply Fri 24 Jun, 2011 08:28 am
http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/10/190_50.gif

7.4 Mw - FOX ISLANDS, ALEUTIAN ISLANDS
Preliminary Earthquake Report
Magnitude 7.4 Mw
Date-Time

24 Jun 2011 03:09:39 UTC
23 Jun 2011 18:09:39 near epicenter
23 Jun 2011 21:09:39 standard time in your timezone

Location 52.042N 171.841W
Depth 46 km
Distances

163 km (101 miles) E (95 degrees) of Atka, AK
225 km (140 miles) WSW (245 degrees) of Nikolski, AK
330 km (205 miles) E (85 degrees) of Adak, AK
1677 km (1042 miles) WSW (243 degrees) of Anchorage, AK


http://www.irishweatheronline.com/news/earthquakesvolcanos/alaska-earthquake-part-of-active-week-for-pacific-ring-of-fire/21352.html

Alaska Earthquake Part Of Active Week For Ring Of Fire

Posted By Mark Dunphy On June 24, 2011 @ 1:02 PM In Earthquakes/Volcanos | No Comments

A 7.2 magnitude earthquake (revised down from 7.4 by the USGS) in Alaska, USA, late Thursday was the latest in a series of strong earthquakes to hit nations located along the Pacific Ring of Fire during the past week.

Among the other nations to record moderate to strong earthquakes this week include Japan, Fiji, Panama, Papua New Guinea, Indonesia, Costa Rica, Solomon Islands, Vanuatu, Tonga, Samoa, Chile, Peru, Bolivia, Argentina and Antarctica.

The “Ring of Fire” is an arc stretching from New Zealand, along the eastern edge of Asia, north across the Aleutian Islands of Alaska, and south along the coast of North and South America. The Ring of Fire is composed over 75% of the world’s active and dormant volcanoes.

The US Geological Survey [2] (USGS) confirmed that a quake measuring 7.2 on the Richter Scale hit the sparsely populated Fox Islands region of the Aleutian Islands. Thursday night. The epicentre, recorded at a depth of 62km, was located 64 km (39 miles) SW of Amukta Island, 103 km (64 miles) SW of Yunaska Island, and 1677 km (1042 miles) WSW of Anchorage, Alaska’s largest city. The quake hit just two days after a 5.1 magnitude earthquake hit the Rat Islands region.

There were no immediate reports of injuries or significant structural damage from Thursday night’s earthquake. A tsunami warning issued for the west coast of North America from the Mexican border to Alaska soon after the quake struck was later cancelled.

A large earthquake (magnitude 6.7) struck off the coast of Honshu, Japan, Wednesday night prompting authorities to issue a tsunami alert for the northeast of the country. The quake epicentre was located 86 km (53 miles) SE (132°) from Hachinohe, Honshu, 100 km (62 miles) ENE (73°) from Morioka, Honshu, Japan, 161 km (100 miles) SE (126°) from Aomori, Honshu, and 527 km (328 miles) NNE (24°) from Tokyo.

A series of large tremors measuring greater than 5 on the Richter Scale have been recorded since Wednesday night’s earthquake, the latest a magnitude 5.2 Thursday night. It was located 173 km (107 miles) SSE of Kagoshima, Kyushu, Japan. Hour earlier a 5.3 quake struck close to the tsunami-stricken port city of Sendai. Japan is still reeling from the March 11 9 magnitude earthquake and tsunami which devastated parts of the north east.

Elsewhere, a 6.2 magnitude earthquake struck The Solomon Islands in the south-western Pacific Ocean Friday morning. The strong quake was centred 25 km (15 miles) SSE of the provincial capital of the Santa Cruz Islands and 444 km (275 miles) E of Kira Kira, San Cristobal. According to the US Geological Survey the quake was recorded at a depth of 62.6 km (38.9 miles). It was the third strong earthquake to his the region this week. A 6.1 quake was recorded 93 km (57 miles) SSW of Lata on Tuesday morning while a 5.5 magnitude quake hit between the Santa Cruz Islands and Vanuatu on Monday evening.

The Santa Cruz Islands are part of Temotu Province of the Solomon Islands. They lie approximately 250 miles (400 km) to the southeast of the Solomon Islands Chain. The Santa Cruz Islands lie just north of the archipelago of Vanuatu, and are considered part of the Vanuatu rain forests ecoregion.

On Thursday night Tonga was hot by a moderate earthquake, which was recorded 102 km (63 miles) NNE of Hihifo and 229 km (142 miles) SW of Apia, Samoa.

On Wednesday night a magnitude 5.2 earthquake was recorded 126 km (78 miles) SSW of Ndoi Island, Fiji. The region was also hit by 5.5 and 5.1 magnitude quakes on Saturday and Sunday respectively.

The Catamarca region of Argentina also experienced a moderate earthquake on Wednesday afternoon. The 5.3 magnitude quake was centred 66 km (41 miles) SE of Belen, Catamarca, and 160 km (99 miles) NNE of La Rioja.

A 5.2 magnitude quake struck the South Island of New Zealand at 10.34 PM (local) on Tuesday. The quake epicentre was located 7km from Christchurch, which has been shaken by thousands of aftershocks since the February 22 quake that killed 181. Earlier on Tuesday the Kermadec Islands Region of New Zealand experienced a magnitude 5 earthquake.

Also on Tuesday, northern Sumatra in Indonesia was shaken by a magnitude 5.2 tremor, located 109 km south of the city of Padang (population 840,352).

A strong earthquake struck the Antofagasta region of Chile Monday afternoon. The epicentre was located 87 km (54 miles) NE of Calama, Antofagasta, and 224 km (139 miles) SW of Uyuni, Bolivia.

A 5.4 magnitude quake hit the small south-western Pacific island nation of Vanuatu on Monday. The earthquake was centred 70 km NW of the town of Sola.

On Sunday a 5.1 magnitude earthquake struck 135 km (83 miles) south of David, Panama and 184 km (114 miles) SSE of Golfito, Costa Rica.

A 4.9 magnitude quake was recorded along the Pacific-Antarctic Ridge On Sunday afternoon, while a magnitude 5.1 tremor was also recorded in the Balleny Islands region, 479 km (297 miles) NW of Scott Island, on Saturday.

On Saturday night the northern coast of Peru experienced a moderate 5 magnitude earthquake which was felt 91 km away in the city of Piura.

On Saturday morning a magnitude 5.2 tremor was recorded in eastern New Guinea region of Papua New Guinea. The quake struck 66 km (41 miles) NW of Lae and 355 km (220 miles) NNW of Port Moresby.
Analysis

Earlier this week Irish Weather Online reported that 2011 is on target to record the largest number of earthquakes in a single year for at least 12 years.

Research by Irish Weather Online, using data from the US Geological Survey (USGS), has found that earthquake activity (5.0-9.9 magnitude) from 01 January to 19 June 2011 is already exceeding the total annual seismic activity for the years 2001, 2002 and 2003. 2011’s total number of recorded earthquakes is also expected to exceed the most seismically active year of the past 12 years, 2007.

A total of 1,445 earthquakes, ranging in magnitude from 5.0 to 9.9, have been recorded in the year up to 19 June. The total number of earthquakes recorded globally for the entire of 2007 was 2,270.

The massive earthquakes in Japan (2011), Chile (2010), Sichuan (2008), Sumatra (2005 and 2008) and Indonesia (2004) have served to remind us of the devastating impact of earthquakes on life and property. While the number of earthquakes ranging between 8.0 magnitude and 9.9 magnitude have shown no significant increases in recent years, the number of earthquakes ranging 5.0 magnitude to 7.9 magnitude is rising. In particular there has been a sharp rise during the past 12 years of moderate earthquakes in the range 5-6.9.

While considered moderate to strong on the Richter Scale and far less severe than 7+ magnitude quakes, earthquakes in this range can still cause widespread damage and loss of life. Some well known examples include Haiti in 2010 (7 mag), San Francisco Bay, California, USA, in 1989 (6.9 mag), Caracas, Venezuela, in 1965 (6.5 mag), Christchurch, New Zealand, in 2011 (6.3 mag), L’Aquila, Italy in 2009 (5.8 mag), and Newcastle , Australia, in 1989 (5.6 mag).

Seismologists argue that an increase in detected earthquakes does not necessarily represent an increase in actual earthquakes. The USGS, for example, says improved global communication and enhancements in detection technology have both contributed to higher earthquake numbers being recorded over time.

According to the USGS: “Although it may seem that we are having more earthquakes, earthquakes of magnitude 7.0 or greater have remained fairly constant throughout this century and, according to our records, have actually seemed to decrease in recent years.”

Commenting on swarm earth activity in a specific geographical area, the USGS said :” A temporal increase in earthquake activity does not mean that a large earthquake is about to happen. Similarly, quiescence, or the lack of seismicity, does not mean a large earthquake is going to happen. A temporary increase or decrease in the seismicity rate is usually just part of the natural variation in the seismicity. There is no way for us to know whether or not this time it will lead to a larger earthquake. Swarms of small events, especially in geothermal areas, are common, and moderate-large magnitude earthquakes will typically have an aftershock sequence that follows. All that is normal and expected earthquake activity.”
0 Replies
 
Butrflynet
 
  1  
Reply Fri 22 Jul, 2011 08:30 am
http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/region/N_America.gif

http://earthquake.usgs.gov/earthquakes/recenteqsus/index.gif

4.5 Mb - OFFSHORE CHIAPAS, MEXICO
Preliminary Earthquake Report
Magnitude 4.5 Mb
Date-Time

22 Jul 2011 06:39:04 UTC
22 Jul 2011 01:39:04 near epicenter
22 Jul 2011 00:39:04 standard time in your timezone

Location 14.873N 93.523W
Depth 66 km
Distances

91 km (57 miles) SW (227 degrees) of Mapastepec, Chiapas, Mexico
96 km (60 miles) SSW (200 degrees) of Pijijiapan, Chiapas, Mexico
117 km (73 miles) WSW (255 degrees) of Huixtla, Chiapas, Mexico
134 km (83 miles) W (269 degrees) of Tapachula, Chiapas, Mexico
324 km (202 miles) W (275 degrees) of GUATEMALA CITY, Guatemala
----------------------
3.9 Ml - SOUTHERN CALIFORNIA
Preliminary Earthquake Report
Magnitude 3.9 Ml
Date-Time

22 Jul 2011 09:08:35 UTC
22 Jul 2011 02:08:35 near epicenter
22 Jul 2011 03:08:35 standard time in your timezone

Location 32.799N 116.159W
Depth 6 km
Distances

17 km (10 miles) WNW (294 degrees) of Ocotillo, CA
20 km (13 miles) N (8 degrees) of Jacumba Hot Springs, CA
35 km (21 miles) E (95 degrees) of Pine Valley, CA
56 km (35 miles) W (271 degrees) of El Centro, CA
86 km (53 miles) ENE (69 degrees) of Tijuana, Baja California, Mexico
-----------------------------
4.6 Mb - ALASKA PENINSULA
Preliminary Earthquake Report
Magnitude 4.6 Mb
Date-Time

22 Jul 2011 09:43:12 UTC
22 Jul 2011 01:43:12 near epicenter
22 Jul 2011 03:43:12 standard time in your timezone

Location 54.954N 161.280W
Depth 41 km
Distances

66 km (41 miles) SW (230 degrees) of Sand Point, AK
67 km (42 miles) E (101 degrees) of King Cove, AK
96 km (59 miles) ESE (107 degrees) of Cold Bay, AK
967 km (601 miles) SW (229 degrees) of Anchorage, AK
-------------------------------------
4.7 Mb - OFFSHORE CHIAPAS, MEXICO
Preliminary Earthquake Report
Magnitude 4.7 Mb
Date-Time

22 Jul 2011 10:07:42 UTC
22 Jul 2011 05:07:42 near epicenter
22 Jul 2011 04:07:42 standard time in your timezone

Location 14.431N 93.084W
Depth 48 km
Distances

94 km (58 miles) W (262 degrees) of Suchiate, Chiapas, Mexico
101 km (63 miles) WSW (239 degrees) of Tapachula, Chiapas, Mexico
104 km (64 miles) SW (220 degrees) of Huixtla, Chiapas, Mexico
277 km (172 miles) W (266 degrees) of GUATEMALA CITY, Guatemala
----------------------------------
5.0 Mb - OFF COAST OF CENTRAL AMERICA
Preliminary Earthquake Report Magnitude 5.0 Mb
Date-Time

22 Jul 2011 10:48:32 UTC
22 Jul 2011 04:48:32 near epicenter
22 Jul 2011 04:48:32 standard time in your timezone

Location 12.197N 88.281W
Depth 51 km
Distances

128 km (80 miles) S (172 degrees) of Usulután, Usulután, El Salvador
128 km (80 miles) WSW (251 degrees) of Chinandega, Nicaragua
131 km (81 miles) WSW (246 degrees) of El Viejo, Chinandega, Nicaragua
134 km (83 miles) WSW (249 degrees) of Chinandega, Chinandega, Nicaragua
190 km (118 miles) SSE (149 degrees) of SAN SALVADOR, El Salvador
-----------------------------------
4.5 Mb - OFFSHORE OAXACA, MEXICO
Preliminary Earthquake Report Magnitude 4.5 Mb
Date-Time

22 Jul 2011 11:58:43 UTC
22 Jul 2011 06:58:43 near epicenter
22 Jul 2011 05:58:43 standard time in your timezone

Location 15.391N 94.865W
Depth 32 km
Distances

94 km (58 miles) SSE (157 degrees) of Salina Cruz, Oaxaca, Mexico
112 km (69 miles) SSE (159 degrees) of Tehuantepec, Oaxaca, Mexico
117 km (73 miles) S (172 degrees) of Juchitán, Oaxaca, Mexico
240 km (149 miles) SW (231 degrees) of Tuxtla Gutiérrez, Chiapas, Mexico
475 km (295 miles) W (281 degrees) of GUATEMALA CITY, Guatemala
0 Replies
 
Butrflynet
 
  1  
Reply Tue 26 Jul, 2011 03:10 pm
5.9 Mw - GULF OF CALIFORNIA
Preliminary Earthquake Report
Magnitude 5.9 Mw
Date-Time

26 Jul 2011 17:44:21 UTC
26 Jul 2011 11:44:21 near epicenter
26 Jul 2011 11:44:21 standard time in your timezone

Location 25.186N 109.549W
Depth 10 km
Distances

87 km (54 miles) SW (222 degrees) of Los Mochis, Sinaloa, Mexico
89 km (55 miles) SSW (205 degrees) of Ahome, Sinaloa, Mexico
96 km (59 miles) SW (229 degrees) of Juan José Ríos, Sinaloa, Mexico
1093 km (679 miles) SE (136 degrees) of Tijuana, Baja California, Mexico
---------------------------
0 Replies
 
Butrflynet
 
  1  
Reply Sun 14 Aug, 2011 05:44 pm
4.1 Ml - OFFSHORE NORTHERN CALIFORNIA
Preliminary Earthquake Report
Magnitude 4.1 Ml
Date-Time

14 Aug 2011 19:27:02 UTC
14 Aug 2011 12:27:02 near epicenter
14 Aug 2011 13:27:02 standard time in your timezone

Location 41.027N 125.325W
Depth 2 km
Distances

99 km (62 miles) W (268 degrees) of Trinidad, CA
100 km (62 miles) WNW (287 degrees) of Bayview, CA
100 km (62 miles) WNW (290 degrees) of Humboldt Hill, CA
101 km (63 miles) WNW (285 degrees) of Eureka, CA
429 km (267 miles) NW (311 degrees) of Sacramento, CA
0 Replies
 
Butrflynet
 
  2  
Reply Mon 22 Aug, 2011 08:05 pm
http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/US10/32.42.-110.-100.gif

4.6 Mb - COLORADO
Preliminary Earthquake Report
Magnitude 4.6 Mb
Date-Time

22 Aug 2011 23:30:20 UTC
22 Aug 2011 17:30:20 near epicenter
22 Aug 2011 17:30:20 standard time in your timezone

Location 37.050N 104.773W
Depth 5 km
Distances

17 km (11 miles) SW (232 degrees) of Cokedale, CO
23 km (14 miles) WSW (251 degrees) of Starkville, CO
27 km (17 miles) WSW (241 degrees) of Trinidad, CO
136 km (84 miles) S (186 degrees) of Pueblo, CO
298 km (185 miles) S (177 degrees) of Denver, CO


Examiner.com

USGS
Breaking: Magnitude 4.6 earthquake rattles area near Trinidad, Colorado

By Tony Hake, Denver Weather Examiner

Southern Colorado was rattled by a magnitude 4.6 earthquake Monday evening near Trinidad. The same area had been struck by a gentler temblor earlier in the morning.

According to the US Geological Survey, the quake occurred at 5:30pm and was centered 16 miles west southwest of Trinidad or 20 miles west northwest of Raton, New Mexico. The quake occurred at a relatively shallow depth of 3.1 miles.

Initial reports show the quake was felt in Trinidad and as far north as La Veta and Aguilar. To the south in New Mexico, Raton felt the shaking as well as Springer and Questa.


This morning a magnitude 2.9 quake struck the same area at 7:52am. This also follows a magnitude 2.8 temblor in March. Other quakes up to magnitude 4.1 have been recorded in January 2010 as well as a series of quakes in the area in August 2009.

The quake this evening represents the most powerful quake to strike the area since 2000 when a temblor magnitude 5.6 occurred. The Sangre de Christo Fault, near which the quake occurred, is located in the mountain range for which it is named and runs more than 110 miles from the New Mexico border north into Colorado.

In 2001 an earthquake “swarm” shook the area near Trinidad on the fault. During that event, from August 28 and September 21 of that year, 12 earthquakes of magnitude 2.8 to 4.6 struck just west of the southern Colorado city in the same area as Monday's quake.

While normally not particularly active, there are approximately 100 potentially active faults in Colorado and more than 400 temblors of magnitude 2.5 have occurred in the state since 1870. The state’s largest quake occurred on November 7, 1882 along the northern Front Range and measured 6.5 on the Richter Scale.

According to the Colorado Division of Emergency Management, the costliest quake was a 5.3 magnitude temblor that occurred on August 9, 1967 and was centered near Commerce City. The quake caused more than $1 million worth of damage and is thought to have been caused by the injection of liquid waste into the earth at the Rocky Mountain Arsenal.

Continue reading on Examiner.com Breaking: Magnitude 4.6 earthquake rattles area near Trinidad, Colorado - Denver Weather | Examiner.com http://www.examiner.com/weather-in-denver/breaking-magnitude-4-6-earthquake-rattles-area-near-trinidad#ixzz1VoVS0Yxk
0 Replies
 
Butrflynet
 
  2  
Reply Tue 23 Aug, 2011 01:14 pm
http://earthquake.usgs.gov/earthquakes/recenteqsus/index.gif

3.9 Ml - COLORADO
Preliminary Earthquake Report
Magnitude 3.9 Ml
Date-Time

23 Aug 2011 14:11:13 UTC
23 Aug 2011 08:11:13 near epicenter
23 Aug 2011 08:11:13 standard time in your timezone

Location 37.032N 104.690W
Depth 5 km
Distances

14 km (9 miles) SSW (206 degrees) of Cokedale, CO
17 km (11 miles) WSW (237 degrees) of Starkville, CO
22 km (14 miles) SW (227 degrees) of Trinidad, CO
137 km (85 miles) S (183 degrees) of Pueblo, CO
300 km (187 miles) S (175 degrees) of Denver, CO

--------------------------------
http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/US10/32.42.-85.-75.gif

5.9 Mw - VIRGINIA
Preliminary Earthquake Report
Magnitude 5.9 Mw
Date-Time

23 Aug 2011 17:51:04 UTC
23 Aug 2011 13:51:04 near epicenter
23 Aug 2011 11:51:04 standard time in your timezone

Location 37.881N 77.952W
Depth 0 km
Distances

14 km (9 miles) SSW (195 degrees) of Mineral, VA
17 km (10 miles) SSE (165 degrees) of Louisa, VA
23 km (14 miles) NE (52 degrees) of Columbia, VA
58 km (36 miles) NW (312 degrees) of Richmond, VA
141 km (88 miles) SW (216 degrees) of Washington, DC
Butrflynet
 
  1  
Reply Tue 23 Aug, 2011 01:45 pm
@Butrflynet,
Quote:
Mineral was originally known as Tolersville,[3] but adopted its current name when it incorporated in 1902 due to the mining industry that supported the community. It was the center of gold mining activity in Louisa County and during its heyday there were no fewer than fifteen gold mines located within two miles (3 km) of the town. A zinc and lead mine also operated in the area into the 1970s.
Butrflynet
 
  1  
Reply Tue 23 Aug, 2011 01:59 pm
@Butrflynet,
http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/se082311a.php#summary

Quote:
Earthquake Summary
Small globe showing earthquakeSmall map showing earthquake
Tectonic Summary

EARTHQUAKES IN THE CENTRAL VIRGINIA SEISMIC ZONE
Central Virginia Seismic Zone Since at least 1774, people in central Virginia have felt small earthquakes and suffered damage from infrequent larger ones. The largest damaging earthquake (magnitude 4.8) in the seismic zone occurred in 1875. Smaller earthquakes that cause little or no damage are felt each year or two.

Earthquakes in the central and eastern U.S., although less frequent than in the western U.S., are typically felt over a much broader region. East of the Rockies, an earthquake can be felt over an area as much as ten times larger than a similar magnitude earthquake on the west coast. A magnitude 4.0 eastern U.S. earthquake typically can be felt at many places as far as 100 km (60 mi) from where it occurred, and it infrequently causes damage near its source. A magnitude 5.5 eastern U.S. earthquake usually can be felt as far as 500 km (300 mi) from where it occurred, and sometimes causes damage as far away as 40 km (25 mi).

FAULTS
Earthquakes everywhere occur on faults within bedrock, usually miles deep. Most bedrock beneath central Virginia was assembled as continents collided to form a supercontinent about 500-300 million years ago, raising the Appalachian Mountains. Most of the rest of the bedrock formed when the supercontinent rifted apart about 200 million years ago to form what are now the northeastern U.S., the Atlantic Ocean, and Europe.

At well-studied plate boundaries like the San Andreas fault system in California, often scientists can determine the name of the specific fault that is responsible for an earthquake. In contrast, east of the Rocky Mountains this is rarely the case. The Central Virginia seismic zone is far from the nearest plate boundaries, which are in the center of the Atlantic Ocean and in the Caribbean Sea. The seismic zone is laced with known faults but numerous smaller or deeply buried faults remain undetected. Even the known faults are poorly located at earthquake depths. Accordingly, few, if any, earthquakes in the seismic zone can be linked to named faults. It is difficult to determine if a known fault is still active and could slip and cause an earthquake. As in most other areas east of the Rockies, the best guide to earthquake hazards in the seismic zone is the earthquakes themselves.



http://earthquake.usgs.gov/earthquakes/states/virginia/history.php
Quote:

Virginia

Earthquake History

On February 21, 1774, a strong earthquake was felt over much of Virginia and southward into North Carolina. Many houses were moved considerably off their foundations at Petersburg and Blandford (intensity MM VII). The shock was described as "severe" at Richmond and "small" at Fredericksburg. However, it "terrified the inhabitants greatly." The total felt area covered about 150,000 square kilometers.

The three great earthquakes near New Madrid, Missouri, in 1811 - 1812 (December 11, January 23, and February 7) were felt strongly in Virginia. Reports from Norfolk and Richmond newspapers describe the effects in detail.

An earthquake, apparently centered in southwestern Virginia, on March 9, 1828, was reported felt over an area of about 565,000 square kilometers, from Pennsylvania to South Carolina and the Atlantic Coastal Plain to Ohio. Very few accounts of the shock were available from places in Virginia; it was reported that doors and windows rattled (MM V). President John Quincy Adams felt this tremor in Washington D.C., and provided a graphic account in his diary. He compared the sensation to the heaving of a ship at sea.

The August 27, 1833, earthquake covered a broad felt area from Norfolk to Lexington and from Baltimore, Maryland, to Raleigh, North Carolina - about 135,000 square kilometers. Two miners were killed in the panic the shock caused at Brown's Coal Pits, near Dover Mills, about 30 kilometers from Richmond. At Charlottesville, Fredericksburg, Lynchburg, and Norfold, windows rattled violently, loose objects shook, and walls of buildings were visibly agitated (MM V).

Another moderately strong, widely felt shock occurred on April 29, 1852. At Buckingham and Wytheville, chimneys were damaged (MM VI). The felt area extended to Washington D.C., Baltimore, Maryland, and Philadelphia, Pennsylvania, and also included many points in North Carolina - approximately 420,000 square kilometers. This pattern was repeated on August 31, 1861. The epicenter was probably in extreme southwestern Virginia or western North Carolina. At Wilkesboro, North Carolina, bricks were shaken from chimneys (MM VI). The lack of Virginia reports may perhaps be ascribed to the fact that the Civil War was under way and there was rather heavy fighting in Virginia at the time. This shock affected about 775,000 square kilometers and was felt along the Atlantic coast from Washington, D.C., to Charleston, South Carolina, and westward to Cincinnati, Louisville, and Gallatin, Tennessee, and southwestward to Columbus, Georgia.

A series of shocks in quick succession disturbed the eastern two-thirds of Virginia and a portion of North Carolina on December 22, 1875. At Manakin, many chimneys were broken and shingles on one store were shaken off (MM VII). Damage to chimneys was reported from other places in Goochland and Powhatan Counties. At Richmond, the shock, which was accompanied by a rumbling noise, was severe and lasted from 20 to 30 seconds; plaster fell and several panes of window glass broke. There was general alarm in all parts of the city; many people ran out of their houses in fright. The total felt area was about 130,000 square kilometers.

The largest earthquake to originate in Virginia is historic times occurred on May 31, 1897. The epicenter was in Giles County, where on May 3, an earlier tremor at Pulaski, Radford, and Roanoke had caused damage (MM VI). Loud rumblings were heard in the epicentral region at various times between May 3 and 31. The shock on the latter date was felt from Georgia to Pennsylvania and from the Atlantic Coast westward to Indiana and Kentucky, an area covering about 725,000 square kilometers. It was especially strong at Pearisburg, where the walls of old brick houses were cracked and bricks were thrown from chimney tops. Springs were muddied and a few earth fissures appeared (MM VIII). Chimneys were shaken down at Bedford City, Houston, Pulaski, Radford, and Roanoke. Chimneys were also broken at Raleigh, North Carolina, Bristol and Knoxville, Tennessee, and Bluefied, West Virginia. Minor tremors continued in the epicentral region from time to time until June 6; other disturbances felt on June 28, September 3, and October 21 were probably aftershocks. On February 5, 1898, the residents of Pulaski reported additional chimney damage (MM VI). People rushed into the streets at Pulsaki and East Radford.

An earthquake on February 11, 1907, caused minor damage at Arvonia, Ashby, and Buckingham. At Arvonia, many people became terrified and ran from their houses (MM VI); although no damage was reported from Columbia, many ran from their homes. The felt area was small, approximately 14,500 square kilometers. Other shocks of lesser intensity occurred in the same area on August 23, 1908, and May 8, 1910.

The Shenadoah Valley region was strongly shaken by an earthquake on April 9, 1918. It was called the "most severe earthquake ever experienced" at Luray. Although little damage resulted, people in many places over the northern valley region were greatly alarmed and rushed from their houses (MM VI). Broken windows were reported at Washington, D.C. The tremor was noticed by President Wilson and his family at the White House; the President's secretary called a newspaper office to learn the cause of the terrifying noise. The felt area extended over 155,000 square kilometers, including parts of Maryland, Pennsylvania, and West Virginia. Another shock on September 5, 1919, was felt in the same general region, although the total affected area was much smaller. It was strongest in the Blue Ridge Mountains south of Front Royal. At Arco, plaster fell and some chimneys were damaged (MM VI). Springs and streams were muddied in the epicentral area.

On December 26, 1929, a moderate shock at Charlottesville shook bricks from a few chineys (MM VI). It was reported felt in various parts of Albemarle County. A number of newspaper accounts gave the date of this earthquake as December 25. Giles County was strongly shaken again on April 23, 1959. At Eggleston and Pembroke, several chimneys were damaged, plaster cracked, and pictures fell from walls (MM VI). A wide area (about 7,500 square kilometers) of southwestern Virginia felt the tremor; a few places in West Virginia also reported the shock.
0 Replies
 
Miller
 
  3  
Reply Tue 23 Aug, 2011 02:04 pm
@Butrflynet,
For real fun, be on a water mattress, when the quake hits.
0 Replies
 
shewolfnm
 
  1  
Reply Tue 23 Aug, 2011 02:37 pm
as usual, btrfly is right on the mark..
0 Replies
 
Butrflynet
 
  1  
Reply Tue 23 Aug, 2011 10:16 pm
@Butrflynet,
4.2 M - VIRGINIA
Preliminary Earthquake Report
Magnitude 4.2 M
Date-Time

24 Aug 2011 00:04:36 UTC
23 Aug 2011 20:04:36 near epicenter
23 Aug 2011 18:04:36 standard time in your timezone

Location 37.917N 77.891W
Depth 7 km
Distances

10 km (6 miles) S (171 degrees) of Mineral, VA
15 km (10 miles) SE (141 degrees) of Louisa, VA
30 km (19 miles) NE (52 degrees) of Columbia, VA
57 km (35 miles) NW (318 degrees) of Richmond, VA
135 km (84 miles) SW (215 degrees) of Washington, DC
farmerman
 
  1  
Reply Wed 24 Aug, 2011 03:00 pm
@Butrflynet,
A colleague and I are reviewing ground motion from the swaying of shelving in stores where they had security cameras. Theres a significant amount of structural damage in Mineral Va. and several other nearb y crossroad communities.
Damage appeared more severe in brick masonry buildings and block buildings.

Weve been looking on the geo maps for several areas where the sediments are more sandy and loose. Weve had some sub saturated conditions lately after some rains and we were looking for these soil deposits to see whether there were any sand blows or wether any bildings were actually doing some sinking. Nothing but well still be out here tomorrow. Then I gotta head back home cause were probably going to get a huge hurricane up thecoast.
Butrflynet
 
  1  
Reply Wed 24 Aug, 2011 04:47 pm
@farmerman,
I bet you'll find a lot of similarities in ground motion to that of the Loma Prieta quake.


One thing I've noticed and wonder if there's any significance to, is, if you take a look at recent large quakes and their GEO positions, many seem to be within a certain band of latitude above and below the equator. Have any professional observers noticed that too?
0 Replies
 
Butrflynet
 
  1  
Reply Wed 24 Aug, 2011 05:15 pm
Lots of quakes all over the globe today, from Norway to Peru.

3.9 Ml - SAN FRANCISCO BAY AREA, CALIF.
Preliminary Earthquake Report
Magnitude 3.9 Ml
Date-Time

24 Aug 2011 06:36:54 UTC
23 Aug 2011 23:36:54 near epicenter
24 Aug 2011 00:36:54 standard time in your timezone

Location 37.748N 122.137W
Depth 9 km
Distances

4 km (3 miles) NNE (19 degrees) of San Leandro, CA
7 km (4 miles) NW (314 degrees) of Castro Valley, CA
8 km (5 miles) N (358 degrees) of San Lorenzo, CA
10 km (6 miles) ESE (123 degrees) of Oakland, CA
25 km (16 miles) E (97 degrees) of San Francisco City Hall, CA
----------------------------
5.4 Mw - NORWEGIAN SEA
Preliminary Earthquake Report
Magnitude 5.4 Mw
Date-Time

24 Aug 2011 08:08:16 UTC
24 Aug 2011 08:08:16 near epicenter
24 Aug 2011 02:08:16 standard time in your timezone

Location 72.595N 3.552E
Depth 11 km
Distances

1058 km (657 miles) NNW (348 degrees) of Trondheim, Norway
1386 km (861 miles) NE (37 degrees) of REYKJAVIK, Iceland
-------------------------
4.4 Ml - CENTRAL CALIFORNIA
Preliminary Earthquake Report
Magnitude 4.4 Ml
Date-Time

24 Aug 2011 11:59:51 UTC
24 Aug 2011 04:59:51 near epicenter
24 Aug 2011 05:59:51 standard time in your timezone

Location 37.545N 118.871W
Depth 9 km
Distances

14 km (9 miles) SE (137 degrees) of Mammoth Lakes, CA
17 km (10 miles) W (264 degrees) of Toms Place, CA
28 km (18 miles) WNW (301 degrees) of Round Valley, CA
254 km (158 miles) ESE (115 degrees) of Sacramento, CA
--------------------------
6.8 Mw - NORTHERN PERU
Preliminary Earthquake Report
Magnitude 6.8 Mw
Date-Time

24 Aug 2011 17:46:11 UTC
24 Aug 2011 12:46:11 near epicenter
24 Aug 2011 11:46:11 standard time in your timezone

Location 7.644S 74.506W
Depth 145 km
Distances

82 km (51 miles) N (2 degrees) of Pucallpa, Peru
205 km (127 miles) W (271 degrees) of Cruzeiro do Sul, Brazil
313 km (194 miles) NE (36 degrees) of Huanuco, Peru
568 km (353 miles) NNE (30 degrees) of LIMA, Peru
0 Replies
 
Butrflynet
 
  1  
Reply Fri 26 Aug, 2011 01:21 pm
Just sticking this here because of the interesting analogy that goes with it:

Magnitude 7.0 - VANUATU
2011 August 20 18:19:24 UTC

Earthquake Details

This event has been reviewed by a seismologist.

Magnitude 7.0
Date-Time

Saturday, August 20, 2011 at 18:19:24 UTC
Sunday, August 21, 2011 at 05:19:24 AM at epicenter
Time of Earthquake in other Time Zones

Location 18.287°S, 168.132°E
Depth 28.5 km (17.7 miles)
Region VANUATU
Distances 69 km (42 miles) SSW of PORT-VILA, Efate, Vanuatu
177 km (109 miles) NW of Isangel, Tanna, Vanuatu
328 km (203 miles) SSE of Luganville, Espiritu Santo, Vanuatu
1853 km (1151 miles) ENE of BRISBANE, Queensland, Australia

http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0005hbt.php#summary

Quote:
Earthquake Summary
Small globe showing earthquakeSmall map showing earthquake
Tectonic Summary

The Vanuatu earthquakes of August 20, 2011 (M 7.1 and M 7.0) resulted from thrust faulting on or near the subduction zone plate boundary between the Australia and Pacific plates in the Coral Sea region of the southwest Pacific. Near the epicenter of the earthquakes, the Australia plate moves to the east-northeast with respect to the Pacific plate at a velocity of approximately 83 mm/year, and begins its eastward decent beneath the arc at the Vanuatu North New Hebrides trench.

The M 7.1 earthquake (August 20, 2011, 16:55 GMT) preceded the M 7.0 event (August 20, 2011, 18:19 GMT) by 84 minutes, and was located approximately 6 km away horizontally, and 12 km in depth - each within location uncertainties of typical global earthquakes. The two events also had approximately the same focal-mechanism. The latter earthquake was almost certainly triggered by the earlier event. Seismologists sometimes refer to a pair of similarly sized shocks that occur at nearly the same time and location as an earthquake "doublet."

These earthquakes are located approximately 80 km to the south of an M 7.3 earthquake that occurred in August of 2010, and 600 km to the south of a sequence of large subduction thrust earthquakes that occurred in October of 2009. The Vanuatu region experiences a very high level of earthquake activity, with almost 50 events of magnitude 7 and larger having been recorded since 1973. The subducting Australia plate is seismically active to depths of about 350 km beneath the islands.
0 Replies
 
 

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