30
   

Quake activity along the San Andreas fault is picking up

 
 
Butrflynet
 
  1  
Sun 4 Apr, 2010 07:50 pm
http://latimesblogs.latimes.com/lanow/2010/04/los-angeles-earthquake-mexicali-damage.html

Earthquake damage in Mexicali; quake was triggered south of San Andreas fault
April 4, 2010 | 6:39 pm

Early reports from Mexico indicate that the border town of Mexicali was damaged in the estimated 7.2 magnitude earthquake in Baja California on Sunday that shook buildings as far north as Los Angeles.

Cesar Garcia, an editor at the Channel 12 TV station in Tijuana, said a two-story parking garage next to the Mexicali government headquarters collapsed, causing several injuries. No deaths had been reported. The government building was also damaged, he said.

The local general hospital was evacuated, with patients transferred to other facilities, according to Garcia.

He also said the news station had not been able to reach anyone in Guadalupe de Victoria, a town 16 miles northeast of the epicenter. Wineries are the main industry there, he said.

In Calexico, California, across the border from Mexicali, Carlton Hargrave, 64, was standing in the entryway of the Family Style Buffet restaurant when the quake hit. The restaurant, he said in a telephone interview, was "almost completely destroyed. We’ve got tables overturned, plates broken on the floor.”

“The ceilings caved in. It was big, I mean, it was major," he said in a shaky voice, as his feet moved over rubble and glass and plate fragments to produce a crunching sound.

There are 653,000 residents in Mexicali, according to 2005 census figures.

The earthquake hit at 3:40 p.m., about 40 miles southeast of Mexicali and 220 miles southeast of Los Angeles. Several major aftershocks have already hit the area, and triggered a 4.1 earthquake six miles southwest of Malibu in the Pacific Ocean.

It moved from the southeast toward the northwest, explaining why Southern California felt the quake strongly, according to seismologist Lucy Jones, who held a news conference at Caltech.

The fault that triggered the quake was probably located on one of the many faults south of the San Andreas fault, Jones said. The fault is probably about 40 to 50 miles long, and probably shook for 20 to 30 seconds. The worst shaking would have occurred closest to the fault, said Jones.

She said scientists would not have enough information to identify the fault until geologists survey the area.

The quake occurred at the junction between two tectonic plates, the Pacific and the North American, that grind against each other through Baja California and California. The quake is probably on a strike-slip fault, which splices through the ground vertically and causes land to move horizontally.

The fault occurred at a location that has been seismically active for the past year, triggering many quakes in the 3-magnitude range, Jones said.

In Los Angeles, no significant damage or injuries were reported. The Los Angeles Fire Department said it saw a slight increase in 911 calls mostly associated with automatic alarms and stuck elevators.

At the Knott's Berry Farm theme park, rides were shut down for 20 minutes while they were inspected, said Willie Parker, a spokesman for the park. No one was stranded on any of the rides, Parker said.

Jennifer Ramp, spokeswoman for San Diego Gas & Electricity, said two major power outages were reported in the San Clemente region and Borrego Springs, located far east of Escondido.

Outages were reported around 3:45 p.m. About 3,854 customers in the communities of Dana Point, Capistrano Beach and Laguna Niguel were without power. In Borrego Springs, 603 customers lacked power.

Three hours later, all power was restored to those in Borrego Springs, but 2,349 customers in the San Clemente region were still without power.
0 Replies
 
Butrflynet
 
  1  
Sun 4 Apr, 2010 08:52 pm
http://www.news.com.au/breaking-news/one-person-dead-in-mexico-after-major-72-earthquake-strikes-near-us-border/story-e6frfku0-1225849873849

One person dead in Mexico after major 7.2 earthquake strikes near US border

* From correspondents in Baja
* From: NewsCore
* April 05, 2010 12:41PM

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o What are these?

THERE has been one death reported in Mexico after a powerful 7.2 earthquake struck near the US border today.

CNN reported the earthquake was stronger than the one that hit Haiti in January, and shook highrise buildings hundreds of kilometres away in Los Angeles and San Diego.

There have been a series of aftershocks in the region, with several topping magnitude 5 according to data recorded by the US Geological Survey.

One person was killed when a building collapsed in Mexicali, the capital of Baja California, according to the assistant director of civil protection in Tijuana, CNN reported.

But there were no reports of major damage or casualties in the US from the earthquake, which struck at 3.40pm (local time) at a depth of 10km, 26km south-southwest of Guadalupe Victoria, Baja California, Mexico.

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It was the biggest quake to hit the Baja California area since 1992, the USGS reported.

Mexicali, a city of 900,000 people, is just 18km from the epicentre and there were reports of sides of buildings falling apart, telephone poles collapsing and roads cracking.

Other areas of northwest Mexico also experienced structural damage and other minor injuries, according to Alfredo Escobedo, Mexico's director of civil protection, CNN reported.

...

In San Diego several buildings and water mains were reported damaged, according to the San Diego Fire Department.
0 Replies
 
Butrflynet
 
  1  
Sun 4 Apr, 2010 09:30 pm
http://www.kpbs.org/news/2010/apr/04/69-earthquake-shakes-south-san-diego-border/

State authorities in Mexicali said at least one person has died and a number of structures have collapsed, including a parking garage under construction at the Baja California Capitol building.

Fires are burning throughout Mexicali due to gas line breaks and damaged propane tanks, said Allen Sandoval, inspector for Baja California Civil Protection. Tijuana and Rosarito fire departments are going to Mexicali to help, said Sandoval.

The Sheraton Harbor Drive in San Diego was evacuated because of cracks in the floor, according to Maurice Luque of the San Diego Fire Department. There have been no other reports of damage in San Diego County.
0 Replies
 
Ticomaya
 
  1  
Sun 4 Apr, 2010 10:57 pm
@Butrflynet,
Butrflynet wrote:
The USSG said it had reports that quake was felt as far away as Las Vegas, Nevada, some 460 kilometers (290 miles) from the epicenter as well as in Los Angeles, 360 kilometers away, and in Phoenix, Arizona (300 kilometers).

I have heard/seen the reports that it was felt here in Phoenix, but I certainly didn't feel anything.
0 Replies
 
Butrflynet
 
  1  
Mon 5 Apr, 2010 12:34 am
USGS finally posted their narrative of the quake.

http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/ci14607652.php#summary

Tectonic Summary

A magnitude 7.2 earthquake occurred at 3:40:40 p.m. (local time at the epicenter) on Sunday, 4 April 2010 in Baja California, approximately 75 km south of the Mexico-USA border. The earthquake occurred at shallow depth (approximately 10 km) along the boundary zone between the North American and Pacific plates. Since earthquakes have been recorded instrumentally, only two similar sized earthquakes have been recorded in the area. The first was the 1892 earthquake estimated at magnitude 7.0-7.2 along the Laguna Salada fault just south of the USA-Mexico border. The second was the 1940 Imperial Valley magnitude 6.9 earthquake which occurred in southernmost California. Today's event is located nearly in line with these earthquakes along the plate boundary, but is situated farther to the south. There are several active faults in the vicinity of today's earthquake, and the particular fault that generated this quake has not yet been determined. Faulting is complex in this region, because the plate boundary is transitional between the ridge-transform system in the Gulf of California and the continental transform system in the Salton Trough. Most of the major active faults are right-lateral strike-slip faults with a northwest-southeast orientation, similar in style to the San Andreas fault to the north. Other faults in the vicinity with the same orientation include the Cerro Prieto fault and the Laguna Salada fault.
JPB
 
  1  
Mon 5 Apr, 2010 10:44 am
@Butrflynet,
There's still some pretty significant activity in that same area.

http://earthquake.usgs.gov/eqcenter/recenteqsus/Maps/US2/31.33.-117.-115.gif
Butrflynet
 
  1  
Mon 5 Apr, 2010 11:43 am
@JPB,
Northern California too, though most are in the 2.0 range. It is a continuing slow creep and I hope it stays that way.

Makes me more concerned about the Pacific Northwest though. That area has been at a standstill while all around them there is the creeping activity of the faults.

I'm trying to find a video of yesterday's press conference at Cal Tech so I can post it. It had a whole lot of educational info in it.
Butrflynet
 
  1  
Mon 5 Apr, 2010 11:52 am
@Butrflynet,
Here's a small part of it. The conference went for several hours:

http://www.cnn.com/video/?/video/us/2010/04/04/bts.lucy.jones.seismologist.ktla


Here's a 10 minute segment of it:

http://video.aol.ca/video-detail/watch-72-magnitude-quake-press-conference-with-caltechs-dr-lucy-jones/1157895229/?icid=VIDLRVNWS06
Butrflynet
 
  1  
Mon 5 Apr, 2010 11:57 am
@Butrflynet,
Five minute video of damage in Mexicali:

http://video.aol.ca/video-detail/ktla-baja-quake-damage-surveyed-and8212-carolyn-costello-reports/3280074615/?icid=VIDLRVNWS05
0 Replies
 
Irishk
 
  1  
Mon 5 Apr, 2010 11:32 pm
I copied and pasted this map into an email to send to a friend earlier today and it was showing "203 earthquakes on this map". It's now showing 607 earthquakes. Wow.

http://earthquake.usgs.gov/eqcenter/recenteqsus/Maps/US2/31.33.-117.-115.gif
0 Replies
 
JPB
 
  1  
Tue 6 Apr, 2010 07:36 am
And climbing still. From what I understand though, lots of smaller quakes are a good thing for slowly releasing the pressure that is building up. It's going to come out one way or the other and numerous gentle releases is better than the big ones. My knowledge of earthquakes and plate tectonics is extremely limited. Maybe farmerman can discuss this for us.

edit: found his post from earlier in the thread

http://able2know.org/topic/126216-1#post-3504405
0 Replies
 
CalamityJane
 
  1  
Tue 6 Apr, 2010 08:10 am
The aftershocks are a bit of nerve wrecking, but if it indeed releases the
stress and would prevent an earthquake of a bigger magnitude then we'll take
the smaller ones easier.
CalamityJane
 
  1  
Thu 8 Apr, 2010 10:55 am
@CalamityJane,
It's starting again - 5.5 same Baja region
http://earthquake.usgs.gov/earthquakes/recenteqsus/Quakes/ci10589037.php
Irishk
 
  1  
Thu 8 Apr, 2010 11:09 am
@CalamityJane,
It's shown on that interactive map 3 posts above. Did San Diego feel it?
CalamityJane
 
  1  
Thu 8 Apr, 2010 12:37 pm
@Irishk,
Yes, we certainly felt them here in San Diego, Irishk
0 Replies
 
Butrflynet
 
  1  
Fri 9 Apr, 2010 05:46 pm


Earthquake Details
Magnitude 4.2
Date-Time

* Friday, April 09, 2010 at 01:27:10 UTC
* Thursday, April 08, 2010 at 04:27:10 PM at epicenter
* Time of Earthquake in other Time Zones

Location 44.244°N, 128.765°W
Depth 10 km (6.2 miles) set by location program
Region OFF THE COAST OF OREGON
Distances

* 371 km (231 miles) W (270°) from Yachats, OR
* 371 km (231 miles) WNW (287°) from Barview, OR
* 372 km (231 miles) W (281°) from Winchester Bay, OR
* 452 km (281 miles) W (275°) from Eugene, OR
* 503 km (312 miles) WSW (256°) from Portland, OR

---------------------------

Earthquake Details
Magnitude 5.1
Date-Time

* Friday, April 09, 2010 at 23:05:42 UTC
* Friday, April 09, 2010 at 04:05:42 PM at epicenter
* Time of Earthquake in other Time Zones

Location 32.219°N, 115.240°W
Depth 10 km (6.2 miles) (poorly constrained)
Region BAJA CALIFORNIA, MEXICO
Distances

* 15 km (9 miles) WSW (237°) from Guadalupe Victoria, Baja California, Mexico
* 51 km (32 miles) WSW (238°) from San Luis Río Colorado, Sonora, Mexico
* 53 km (33 miles) SSE (156°) from Mexicali, Baja California, Mexico
* 171 km (106 miles) E (101°) from Tijuana, Baja California, Mexico
0 Replies
 
Butrflynet
 
  1  
Fri 9 Apr, 2010 05:47 pm
Earthquake Details
Magnitude 5.0
Date-Time

* Friday, April 09, 2010 at 23:11:59 UTC
* Friday, April 09, 2010 at 05:11:59 PM at epicenter
* Time of Earthquake in other Time Zones

Location 0.964°N, 85.338°W
Depth 11.6 km (7.2 miles)
Region OFF THE COAST OF ECUADOR
Distances 515 km (320 miles) ENE of Puerto Baquerizo Moreno, Galapagos
540 km (335 miles) SSE of Isla del Coco, Costa Rica
695 km (435 miles) WNW of Guayaquil, Ecuador
770 km (480 miles) W of QUITO, Ecuador
0 Replies
 
Butrflynet
 
  1  
Mon 12 Apr, 2010 09:51 am
3.5 Ml - CENTRAL CALIFORNIA
Preliminary Earthquake Report Magnitude 3.5 Ml
Date-Time

* 12 Apr 2010 11:37:46 UTC
* 12 Apr 2010 04:37:46 near epicenter
* 12 Apr 2010 03:37:46 standard time in your timezone

Location 36.577N 121.176W
Depth 8 km
Distances

* 6 km (4 miles) NNW (330 degrees) of Pinnacles, CA
* 21 km (13 miles) NE (41 degrees) of Soledad, CA
* 25 km (16 miles) ENE (72 degrees) of Gonzales, CA
* 36 km (22 miles) SSE (147 degrees) of Hollister, CA
* 106 km (66 miles) SE (143 degrees) of San Jose City Hall, CA

---------------------------

3.6 Ml - OFFSHORE NORTHERN CALIFORNIA
Preliminary Earthquake Report Magnitude 3.6 Ml
Date-Time

* 12 Apr 2010 15:10:05 UTC
* 12 Apr 2010 08:10:05 near epicenter
* 12 Apr 2010 07:10:05 standard time in your timezone

Location 40.301N 124.442W
Depth 19 km
Distances

* 14 km (8 miles) W (259 degrees) of Petrolia, CA
* 34 km (21 miles) SSW (206 degrees) of Ferndale, CA
* 36 km (22 miles) SW (232 degrees) of Rio Dell, CA
* 59 km (37 miles) SSW (204 degrees) of Eureka, CA
* 321 km (199 miles) NW (308 degrees) of Sacramento, CA
0 Replies
 
Butrflynet
 
  1  
Fri 16 Apr, 2010 11:19 pm
Magnitude 4.4 - OFF THE COAST OF NORTHERN CALIFORNIA
2010 April 17 04:22:13 UTC

Earthquake Details
Magnitude 4.4
Date-Time

* Saturday, April 17, 2010 at 04:22:13 UTC
* Friday, April 16, 2010 at 08:22:13 PM at epicenter
* Time of Earthquake in other Time Zones

Location 40.392°N, 127.169°W
Depth 10 km (6.2 miles) set by location program
Region OFF THE COAST OF NORTHERN CALIFORNIA
Distances

* 244 km (152 miles) W (273°) from Petrolia, CA
* 247 km (153 miles) W (266°) from Ferndale, CA
* 253 km (157 miles) W (262°) from Humboldt Hill, CA
* 258 km (160 miles) W (261°) from Eureka, CA
* 503 km (312 miles) NW (307°) from San Francisco City Hall, CA
0 Replies
 
Butrflynet
 
  1  
Sat 17 Apr, 2010 03:47 pm
4.2 Mw - NORTHERN CALIFORNIA
Preliminary Earthquake Report Magnitude 4.2 Mw
Date-Time

* 17 Apr 2010 21:21:09 UTC
* 17 Apr 2010 14:21:09 near epicenter
* 17 Apr 2010 13:21:09 standard time in your timezone

Location 38.407N 122.994W
Depth 5 km
Distances

* 4 km (2 miles) WSW (245 degrees) of Occidental, CA
* 7 km (4 miles) SSE (166 degrees) of Monte Rio, CA
* 10 km (6 miles) NNE (23 degrees) of Bodega Bay, CA
* 26 km (16 miles) W (260 degrees) of Santa Rosa, CA
* 86 km (54 miles) NW (325 degrees) of San Francisco City Hall, CA
0 Replies
 
 

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