Quake activity along the San Andreas fault is picking up

April 16, 2013
Powerful Earthquake Strikes in Iran
By THOMAS ERDBRINK
TEHRAN — Southeast Iran was hit by the most powerful earthquake to strike the country in 40 years on Tuesday, and its reverberations were felt as far away as India, but Iranian officials said the tremor had originated so deep underground, and in such a sparsely populated area, that it caused relatively few casualties and only minor damage.

The authorities in Iran had initially feared hundreds of deaths from the 7.8-magnitude earthquake, but scaled back their assessment as it became clear that its depth, initially reported to be only about 10 miles beneath the surface, was more than 56 miles beneath. The shallower the quake, the greater the ground motion and potential for damage.

The earthquake, which struck at 3:14 p.m. local time, was felt in several countries in Asia, rocking buildings in the Indian capital, New Delhi, sending panicked resident of Karachi, Pakistan, fleeing into the streets and causing tremors through Persian Gulf states.

The United States Geological Survey said the earthquake’s epicenter was near Khash, Iran, not far from the border with Pakistan, in the Iranian province of Sistan and Baluchistan.

The province, with vast expanses of unpopulated territory, is home to nearly two million people. Most are concentrated in Zahedan, the provincial capital, and the cities of Saravan and Khash.

The semiofficial Fars news agency quoted Iran’s seismology center as saying the earthquake was the worst in 40 years.

But Mohammad Sarvar, head of Iran’s Emergency Medical Service, was quoted by the news agency as saying the power of the earthquake overstated its effects.

“We still do not have an accurate number of casualties but due to the low population density, we foresee the number of casualties is not high,” he was quoted as telling Fars, adding that officials the city of Saravan were not reporting any casualties. Still, other officials said a precautionary state of emergency was declared there.

In Zahedan, Mahmoud Taheri, general manager of crisis infrastructure and telecommunication affairs, said in an interview by telephone that he had felt the earthquake but that it had not caused any damage. He also said there were no reports of casualties or serious damage in Saravan, which was the closest city to the earthquake’s epicenter.

Mr. Taheri said two villages, Mak Soukhte and Lolokdan, about 35 miles from the epicenter, had been damaged, but that “fortunately there are not many people living in these areas.”

Iran is vulnerable to earthquakes, some of which have taken tens of thousands of lives. In 2003, a 6.6-magnitude earthquake near the city of Bam killed at least 26,000 people, and in 1990 at least 30,000 people died in an earthquake along the Caspian Sea. Last week, a 6.1-magnitude earthquake hit in Bushehr Province, home to Iran’s main nuclear reactor, killing more than 30 people.

Sistan-Baluchistan Province is among the poorest of Iran. Most residents are Sunni Muslims, a minority in the largely Shiite Muslim country, and many are from the Baluchi tribe, which originates in Iran and Pakistan. The area is known for its drug trade and is regularly the scene of bombings carried out by separatist groups.

In Karachi, the southern port city in Pakistan, local television broadcast images of people standing in the streets after fleeing high-rise buildings. Tremors were felt most strongly in southern and central parts of Pakistan.

“It seems as if the buildings will fall any minute,” an unidentified man in Karachi told GEO News, a private television news network.

The only report of fatalities, however, came from the adjoining province of Baluchistan, which borders Iran, where the Human Rights Commission of Pakistan reported five deaths. Tahir Hussain, a lawyer with the human rights group, said the victims were all in the remote town of Panjgur, 50 miles from the border.

“A wall collapsed and five people lost their lives, including three children and a woman,” he said, speaking by phone from Quetta, the capital of Baluchistan.

In New Delhi, which is periodically shaken by temblors, buildings shook for more than 10 seconds and, in some areas, frightened people ran into the streets. No injuries were reported, nor were there any early reports of property damage there.

They are experiencing a swarm of small to medium sized quakes in Oklahoma this week.

M3.6 - OKLAHOMA

Preliminary Earthquake Report
Magnitude 3.6
Date-Time
16 Apr 2013 21:51:19 UTC
16 Apr 2013 16:51:20 near epicenter
16 Apr 2013 15:51:19 standard time in your timezone
Location 35.808N 97.162W
Depth 4 km
Distances
16 km (9 mi) N of Luther, Oklahoma
25 km (15 mi) ESE of Guthrie, Oklahoma
33 km (20 mi) ENE of Edmond, Oklahoma
35 km (21 mi) SSW of Stillwater, Oklahoma
49 km (30 mi) NE of Oklahoma City, Oklahoma
--------------------------------

M3.5 - OKLAHOMA

Preliminary Earthquake Report
Magnitude 3.5
Date-Time
16 Apr 2013 17:07:19 UTC
16 Apr 2013 12:07:19 near epicenter
16 Apr 2013 11:07:19 standard time in your timezone
Location 35.690N 97.095W
Depth 8 km
Distances
9 km (5 mi) ENE of Luther, Oklahoma
26 km (16 mi) NE of Choctaw, Oklahoma
34 km (21 mi) E of Edmond, Oklahoma
36 km (22 mi) SE of Guthrie, Oklahoma
45 km (27 mi) ENE of Oklahoma City, Oklahoma

M7.2 - KURIL ISLANDS

Preliminary Earthquake Report
Magnitude 7.2
Date-Time
19 Apr 2013 03:05:53 UTC
19 Apr 2013 15:05:54 near epicenter
18 Apr 2013 21:05:53 standard time in your timezone
Location 46.182N 150.796E
Depth 122 km
Distances
250 km (155 mi) ENE of Kuril'sk, Russia
521 km (323 mi) NE of Nemuro, Japan
527 km (326 mi) NE of Shibetsu, Japan
566 km (350 mi) ENE of Abashiri, Japan
1490 km (923 mi) NE of Tokyo, Japan

M4.2 - SOUTHERN IDAHO

Preliminary Earthquake Report
Magnitude 4.2
Date-Time
6 May 2013 03:13:42 UTC
5 May 2013 21:13:43 near epicenter
5 May 2013 21:13:42 standard time in your timezone
Location 42.608N 111.947W
Depth 11 km
Distances
28 km (17 mi) W of Soda Springs, Idaho
50 km (31 mi) SE of Pocatello, Idaho
54 km (33 mi) SE of Chubbuck, Idaho
72 km (44 mi) SSE of Blackfoot, Idaho
205 km (127 mi) N of Salt Lake City, Utah

Big swarm of quakes in this spot this afternoon. Last count had it at 15 of 5.0+ magnitude in the span of about 6 hours. This one was the largest on the Richter scale.

M5.9 - OFF THE EAST COAST OF KAMCHATKA, RUSSIA

Preliminary Earthquake Report
Magnitude 5.9
Date-Time
19 May 2013 18:44:11 UTC
20 May 2013 05:44:11 near epicenter
19 May 2013 12:44:11 standard time in your timezone
Location 52.277N 160.152E
Depth 19 km
Distances
132 km (81 mi) SE of Petropavlovsk-Kamchatskiy, Russia
139 km (86 mi) ESE of Vilyuchinsk, Russia
156 km (96 mi) SE of Yelizovo, Russia
998 km (618 mi) SE of Magadan, Russia
2450 km (1519 mi) NE of Tokyo, Japan


Tectonic Summary

Seismotectonics of the Kuril-Kamchatka Arc

The Kuril-Kamchatka arc extends approximately 2,100 km from Hokkaido, Japan, along the Kuril Islands and the Pacific coast of the Kamchatka Peninsula to its intersection with the Aleutian arc near the Commander Islands, Russia. It marks the region where the Pacific plate subducts into the mantle beneath the Okhotsk microplate, part of the larger North America plate. This subduction is responsible for the generation of the Kuril Islands chain, active volcanoes located along the entire arc, and the deep offshore Kuril-Kamchatka trench. Relative to a fixed North America plate, the Pacific plate is moving towards the northwest at a rate that increases from 75 mm/year near the northern end of the arc to 83 mm/year in the south.

Plate motion is predominantly convergent along the Kuril-Kamchatka arc with obliquity increasing towards the southern section of the arc. The subducting Pacific plate is relatively old, particularly adjacent to Kamchatka where its age is greater than 100 Ma. Consequently, the Wadati-Benioff zone is well defined to depths of approximately 650 km. The central section of the arc is comprised of an oceanic island arc system, which differs from the continental arc systems of the northern and southern sections. Oblique convergence in the southern Kuril arc results in the partitioning of stresses into both trench-normal thrust earthquakes and trench-parallel strike-slip earthquakes, and the westward translation of the Kuril forearc. This westward migration of the Kuril forearc currently results in collision between the Kuril arc in the north and the Japan arc in the south, resulting in the deformation and uplift of the Hidaka Mountains in central Hokkaido.

The Kuril-Kamchatka arc is considered one of the most seismically active regions in the world. Deformation of the overriding North America plate generates shallow crustal earthquakes, whereas slip at the subduction zone interface between the Pacific and North America plates generates interplate earthquakes that extend from near the base of the trench to depths of 40 to 60 km. At greater depths, Kuril-Kamchatka arc earthquakes occur within the subducting Pacific plate and can reach depths of approximately 650 km.

This region has frequently experienced large (M>7) earthquakes over the past century. Since 1900, seven great earthquakes (M8.3 or larger) have also occurred along the arc, with mechanisms that include interplate thrust faulting, and intraplate faulting. Damaging tsunamis followed several of the large interplate megathrust earthquakes. These events include the February 3, 1923 M8.4 Kamchatka, the November 6,1958 M8.4 Etorofu, and the September 25, 2003 M8.3 Hokkaido earthquakes. A large M8.5 megathrust earthquake occurred on October 13, 1963 off the coast of Urup, an island along the southern Kuril arc, which generated a large tsunami in the Pacific Ocean and the Sea of Okhotsk, and caused run-up wave heights of up to 4-5 m along the Kuril arc. The largest megathrust earthquake to occur along the entire Kurile-Kamchatka arc in the 20th century was the November 4, 1952 M9.0 event. This earthquake was followed by a devastating tsunami with run-up wave heights as high as 12 m along the coast of Paramushir, a small island immediately south of Kamchatka, causing significant damage to the city of Severo-Kurilsk.

On October 4,1994, a large (M8.3) intraplate event occurred within the subducted oceanic lithosphere off the coast of Shikotan Island causing intense ground shaking, landslides, and a tsunami with run-up heights of up to 10 m on the island.

The most recent megathrust earthquake in the region was the November 15, 2006 M8.3 Kuril Island event, located in the central section of the arc. Prior to this rupture, this part of the subduction zone had been recognized as a seismic gap spanning from the northeastern end of the 1963 rupture zone to the southwestern end of the 1952 rupture. Two months after the 2006 event, a great (M8.1) normal faulting earthquake occurred on January 13, 2007 in the adjacent outer rise region of the Pacific plate. It has been suggested that the 2007 event may have been caused by the stresses generated from the 2006 earthquake.

2013-05-23 17:19:04 UPDATED: (M7.4) SOUTH OF THE FIJI ISLANDS -23.0 -177.1 (1d99c)

M7.4 - SOUTH OF THE FIJI ISLANDS

Preliminary Earthquake Report
Magnitude 7.4
Date-Time
23 May 2013 17:19:04 UTC
23 May 2013 05:19:04 near epicenter
23 May 2013 11:19:04 standard time in your timezone
Location 23.025S 177.109W
Depth 171 km
Distances
282 km (174 mi) SW of Vaini, Tonga
287 km (177 mi) SW of Nuku`alofa, Tonga
712 km (441 mi) SE of Suva, Fiji
812 km (503 mi) SE of Nadi, Fiji
818 km (507 mi) SSE of Lambasa, Fiji

HONOLULU, Hawaii – A magnitude 7.4 earthquake has struck south of the Fiji Islands, but no Pacific wide tsunami is expected and there is no tsunami threat to Hawaii.

The Pacific Tsunami Warning Center says based on all available data a destructive tsunami has not been generated.

The quake happened 106 miles below the ocean, and was actually closest to Vaini, Tonga (174 miles to southwest.)

The quake was 441 miles southeast of Suva, Fiji.

According to the United States Geological Survey, the Eastern Margin of the Australia Plate, which stretches from New Zealand to the east of Tonga and Fiji, is highly active.

From the USGS Tectonic Summary:

The eastern margin of the Australia plate is one of the most sesimically active areas of the world due to high rates of convergence between the Australia and Pacific plates. In the region of New Zealand, the 3000 km long Australia-Pacific plate boundary extends from south of Macquarie Island to the southern Kermadec Island chain. It includes an oceanic transform (the Macquarie Ridge), two oppositely verging subduction zones (Puysegur and Hikurangi), and a transpressive continental transform, the Alpine Fault through South Island, New Zealand.

Since 1900 there have been 15 M7.5+ earthquakes recorded near New Zealand. Nine of these, and the four largest, occurred along or near the Macquarie Ridge, including the 1989 M8.2 event on the ridge itself, and the 2004 M8.1 event 200 km to the west of the plate boundary, reflecting intraplate deformation. The largest recorded earthquake in New Zealand itself was the 1931 M7.8 Hawke’s Bay earthquake, which killed 256 people. The last M7.5+ earthquake along the Alpine Fault was 170 years ago; studies of the faults’ strain accumulation suggest that similar events are likely to occur again.

North of New Zealand, the Australia-Pacific boundary stretches east of Tonga and Fiji to 250 km south of Samoa. For 2,200 km the trench is approximately linear, and includes two segments where old (>120 Myr) Pacific oceanic lithosphere rapidly subducts westward (Kermadec and Tonga). At the northern end of the Tonga trench, the boundary curves sharply westward and changes along a 700 km-long segment from trench-normal subduction, to oblique subduction, to a left lateral transform-like structure.

Busy day for the Pacific Rim...


M5.9 - NORTHERN CALIFORNIA

Preliminary Earthquake Report
Magnitude 5.9
Date-Time
24 May 2013 03:47:07 UTC
23 May 2013 20:47:08 near epicenter
23 May 2013 21:47:07 standard time in your timezone
Location 40.190N 121.064W
Depth 0 km
Distances
11 km (6 mi) WNW of Greenville, California
43 km (26 mi) SW of Susanville, California
60 km (37 mi) NE of Magalia, California
67 km (41 mi) NE of Paradise, California
159 km (98 mi) NW of Carson City, Nevada

----------------------
M4.5 - SOUTHERN CALIFORNIA

Preliminary Earthquake Report
Magnitude 4.5
Date-Time
24 May 2013 05:54:03 UTC
23 May 2013 22:54:04 near epicenter
23 May 2013 23:54:03 standard time in your timezone
Location 34.216N 117.025W
Depth 99 km
Distances
7 km (4 mi) E of Running Springs, California
15 km (9 mi) ESE of Lake Arrowhead, California
17 km (10 mi) WSW of Big Bear City, California
19 km (11 mi) ENE of Highland, California
466 km (288 mi) WNW of Phoenix, Arizona
------------------------------
M4.9 - NORTHERN CALIFORNIA

Preliminary Earthquake Report
Magnitude 4.9
Date-Time
24 May 2013 08:02:19 UTC
24 May 2013 01:02:19 near epicenter
24 May 2013 02:02:19 standard time in your timezone
Location 40.172N 121.082W
Depth 0 km
Distances
11 km (6 mi) WNW of Greenville, California
45 km (27 mi) SW of Susanville, California
58 km (35 mi) NE of Magalia, California
64 km (39 mi) NE of Paradise, California
158 km (97 mi) NW of Carson City, Nevada
--------------
M4.9 - NORTHERN CALIFORNIA

Preliminary Earthquake Report
Magnitude 4.9
Date-Time
24 May 2013 08:02:19 UTC
24 May 2013 01:02:19 near epicenter
24 May 2013 02:02:19 standard time in your timezone
Location 40.172N 121.082W
Depth 0 km
Distances
11 km (6 mi) WNW of Greenville, California
45 km (27 mi) SW of Susanville, California
58 km (35 mi) NE of Magalia, California
64 km (39 mi) NE of Paradise, California
158 km (97 mi) NW of Carson City, Nevada
-----------------------
M4.6 - NORTHERN CALIFORNIA

Preliminary Earthquake Report
Magnitude 4.6
Date-Time
24 May 2013 03:48:57 UTC
23 May 2013 20:48:57 near epicenter
23 May 2013 21:48:57 standard time in your timezone
Location 40.167N 121.074W
Depth 14 km
Distances
10 km (6 mi) WNW of Greenville, California
45 km (27 mi) SW of Susanville, California
58 km (35 mi) NE of Magalia, California
65 km (40 mi) NE of Paradise, California
158 km (97 mi) NW of Carson City, Nevada

http://www.latimes.com/local/lanow/la-me-ln-largest-earthquake-in-california-since-2008-hit-a-lessstudied-region-20130524,0,3279397.story

The largest earthquake to shake California since 2008 occurred in a less studied area of the state, prompting seismologists to head to the Northern California region with more monitoring equipment, officials said Friday.

Thursday's magnitude 5.7 quake struck about 8:47 p.m. about 150 miles northeast of Sacramento; its epicenter was about 27 miles southwest of the town of Susanville and seven miles west-northwest of Greenville.

The mountainous eastern Sierra Nevada region, known for its lakes, rivers and national forests, has had about seven magnitude 4 earthquakes since the 1930s, said David Schwartz, an earthquake geologist for the Northern California USGS division in Menlo Park.

Thursday’s quake did occur in a zone where there are known active faults, Schwartz said, including a series of faults that extend through the northern end of Lake Tahoe all the way to Oregon. But magnitude 5.7 is the strongest recorded in this region.

Seismologists are still studying the intensity of Thursday’s ground shaking, and Schwartz said it will be a few days before they can identify with greater certainty which fault the temblor occurred on.

The region’s seismic activity is not as well studied compared to urban areas like Los Angeles or San Francisco, Schwartz said. There are more seismographs in place for these more populated, high-seismic areas, he said.

Since Thursday’s quake, officials have moved some of these instruments to this more rugged region to monitor the aftershocks.

The quake itself was not a huge surprise for Schwartz’s division, but “what was interesting was it was felt along an unusual distance,” he said. “Earthquakes in different parts of the state are felt over different distances. We just haven’t had that many examples of earthquakes in this part of the state, really, for comparison.”

Within minutes of the first quake, more than 7,000 people reported feeling it, from across state borders into Oregon and Nevada and as far south as the San Francisco area, according to the U.S. Geological Survey website.

“I think it was a little bit of a surprise that it was felt so far down into the Bay area,” Schwartz said. “There are more interesting questions now than we have answers for, at present.”

More than four dozen aftershocks, ranging up to a magnitude 4.9 in a zone of about 4 miles by 5 miles, have been recorded since the first quake, according to the USGS.

Schwartz said these aftershocks look to be “fairly standard.” Within the next week, there is a 20% chance an earthquake larger than magnitude 5 will strike the area and a 5% to 10% chance a quake of a magnitude greater than 5.7, according to a USGS probability report released Friday morning.

There have been no reports of injures, Plumas County sheriff’s officials said. About 600 residents lost power for a brief period, and a water tank was ruptured due to the earthquake, affecting up to 1,500 customers.

At least three homes in the area had moderate collapsed chimneys and plaster cracking, authorities said. No structural damage have been reported.

“A 5.7 is still a moderate size earthquake, and earthquakes of that magnitude can occur really anywhere throughout the state,” Schwartz said. “But it’s large enough to generate interest and provide us some real info on how things work. We plan to keep looking at the sequence.”

http://www.wired.com/wiredscience/2013/05/earthquake-swarm-near-greenville-in-california/

I’ve been getting a lot of questions about the current Greenville, California earthquake swarm. This is likely due to the fact that the swarm is in the vicinity of the Lassen Volcanic Center, which is ~50 km to the northwest of these earthquakes. Now, I don’t like to delve too much into earthquakes that aren’t volcanically-related here, but I thought I’d share some information on the earthquakes just to help with some of these questions.

First, these earthquakes have nothing to do with the Lassen Volcanic Center (LVC). They are centered much too far away to have any connection. They might be felt up there in the Park, but there is no reason to think that there is any relationship between earthquakes and the LVC. You can check out the LVC’s seismicity on the webicorders for the area — right now they’re picking up a lot of the shaking going on down at Greenville.

Second, looking at the technical information on the largest of the earthquakes in the swarm, they look to be mainly strike-slip earthquakes. This means that two pieces of crust are sliding next to each other (like the San Andreas fault system). The depths of the earthquakes are fairly shallow, all within the top 11 km of the crust, many much shallower than 11 km.

Third, thanks to a suggestion by Becky Oskin, they look like they might be related to the Mohawk Valley fault system. I found a research report by the Nevada Bureau of Mines and Geology on the Mohawk Valley system and marked where this swarm is occurring and you can see that one of the faults (in purple; above) does run up to the southern shores of Lake Almanor, the location of the current swarm. You can see from the figure above that shows seismicity in the area between 1986-2006 that it is actually a fairly active fault system, so the earthquakes here should be no surprise — this swarm was just started by an earthquake of a magnitude larger than many along the Mohawk Valley system. The fault system is dominantly strike-slip, so this swarm also fits in with their style of motion as well.

M8.3 - Sea of Okhotsk
2013-05-24 05:44:49 UTC
Event Time

2013-05-24 05:44:49 UTC
2013-05-24 15:44:49 UTC+10:00 at epicenter
2013-05-23 23:44:49 UTC-06:00 system time
Location

54.874°N 153.280°E depth=608.9km (378.4mi)

Nearby Cities

362km (225mi) WSW of Esso, Russia
383km (238mi) WNW of Yelizovo, Russia
400km (249mi) NW of Vilyuchinsk, Russia
406km (252mi) WNW of Petropavlovsk-Kamchatskiy, Russia
2374km (1475mi) NNE of Tokyo, Japan

http://www.washingtonpost.com/blogs/worldviews/wp/2013/05/24/massive-russian-earthquake-felt-4000-miles-from-epicenter/

MOSCOW – If an earthquake can shake Moscow, what’s next?
Anyone taking a look at the Global Seismic Hazard Map can see that the capital of Russia sits squarely in a big boring gray blotch, which means – no hazard. At all. Yet on Friday, a great big earthquake let loose deep under the Sea of Okhotsk, way off by the Pacific Ocean, and a seismic wave hurtled across Siberia and through the Ural Mountains and under the Volga River and past the endless potato fields and shook flower vases in Moscow apartments.
Moscow is 4,000 miles from the epicenter. That’s like an earthquake in Anchorage stirring your mojito in Miami.
It can happen, apparently. In this case, in fact, it did, said the Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet).

The Sea of Okhotsk is an arm of the Pacific formed by the Kamchatka peninsula, a zone of legendary seismic activity. The earthquake struck about 250 miles northwest of the city of Petropavlovsk-Kamchatsky, and registered either 8.0 (according to Russian monitors) or 8.2 (say the Americans) on the Richter scale. It was reported to have occurred 375 miles under the sea bed, which could account for its being felt so far away.
As of Friday night, though, Russian emergency teams that went into action had been unable to find any significant damage or injuries. A tsunami warning was called off. Across thousands and thousands of square miles of steppe and taiga and tundra, not much fell apart. People in nine time zones felt their houses sway, either grew alarmed or didn’t, and then it was over.

“The entire continent was shaken,” Anatoly Tsygankov, head of Roshydromet’s emergencies center, told the Interfax news agency.
Russia, of course, is a big place, and a lot of it is astonishingly remote, so a final damage report is still not in.

Moscow police said that 9,000 people fled their apartments or offices, though how they were counted isn’t clear. Thirty-six people called the city’s emergency line. The mayor, Sergei Sobyanin, put out the word: “Nothing terrible is happening,” he said.

Farmerman, remember when you wrote this two months ago? Looks like your predictions are coming to fruition.

I know someone in Greenville, if she still lives there. I haven't talked with her for more than 40 years, and if she is still alive (we are getting older) and living there (I looked her up online once, not all that long ago) she is likely busy.

She's the one who told me "Never get a pet. It'll keep you from finding a man." (Tongue in cheek, I think)

M3.6 - PUGET SOUND REGION, WASHINGTON

Preliminary Earthquake Report
Magnitude 3.6
Date-Time
20 Aug 2013 18:41:30 UTC
20 Aug 2013 11:41:30 near epicenter
20 Aug 2013 12:41:30 standard time in your timezone
Location 47.355N 122.712W
Depth 5 km
Distances
2 km (1 mi) ENE of Key Center, Washington
9 km (5 mi) NW of Artondale, Washington
18 km (11 mi) NW of University Place, Washington
21 km (13 mi) SSW of Port Orchard, Washington
38 km (23 mi) NNE of Olympia, Washington

2013-08-23 21:38:35 (M3.6) WASHINGTON 46.3 -122.4 (1d99c)
M3.6 - WASHINGTON

Preliminary Earthquake Report
Magnitude 3.6
Date-Time
23 Aug 2013 21:38:35 UTC
23 Aug 2013 14:38:35 near epicenter
23 Aug 2013 15:38:35 standard time in your timezone
Location 46.326N 122.396W
Depth 15 km
Distances
27 km (16 mi) SSW of Morton, Washington
44 km (27 mi) ENE of Kelso, Washington
46 km (28 mi) ENE of Longview, Washington
60 km (37 mi) SE of Centralia, Washington
88 km (54 mi) SSE of Olympia, Washington

M7.0 - ANDREANOF ISLANDS, ALEUTIAN IS., ALASKA
Preliminary Earthquake Report
Magnitude 7.0
Date-Time
30 Aug 2013 16:25:03 UTC
30 Aug 2013 04:25:03 near epicenter
30 Aug 2013 10:25:03 standard time in your timezone
Location 51.711N 175.366W
Depth 34 km
Distances
91 km (56 mi) ESE of Adak, Alaska
1509 km (935 mi) SSE of Anadyr', Russia
1765 km (1094 mi) E of Petropavlovsk-Kamchatskiy, Russia
1782 km (1104 mi) E of Yelizovo, Russia
2642 km (1638 mi) W of Whitehorse, Canada

M4.5 - OFF THE EAST COAST OF THE UNITED STATES
Preliminary Earthquake Report
Magnitude 4.5
Date-Time
8 Oct 2013 01:58:11 UTC
7 Oct 2013 20:58:11 near epicenter
7 Oct 2013 19:58:11 standard time in your timezone
Location 30.241N 74.178W
Depth 13 km
Distances
496 km (307 mi) NE of Cooper's Town, Bahamas
557 km (345 mi) SE of Masonboro, North Carolina
566 km (350 mi) SE of Wilmington, North Carolina
567 km (351 mi) SE of Murraysville, North Carolina
653 km (404 mi) NNE of Nassau, Bahamas

M5.0 - OFFSHORE NORTHERN CALIFORNIA

Preliminary Earthquake Report
Magnitude 5.0
Date-Time
11 Oct 2013 23:05:37 UTC
11 Oct 2013 15:05:38 near epicenter
11 Oct 2013 17:05:37 standard time in your timezone
Location 40.969N 124.747W
Depth 10 km
Distances
52 km (32 mi) WNW of Eureka, California
54 km (33 mi) W of McKinleyville, California
57 km (35 mi) WNW of Arcata, California
59 km (36 mi) WNW of Bayside, California
384 km (238 mi) NW of Sacramento, California

M7.2 - BOHOL, PHILIPPINES

Preliminary Earthquake Report
Magnitude 7.2
Date-Time
15 Oct 2013 00:12:37 UTC
15 Oct 2013 08:12:37 near epicenter
14 Oct 2013 18:12:37 standard time in your timezone
Location 9.765N 124.022E
Depth 56 km
Distances
5 km (3 mi) E of Balilihan, Philippines
21 km (13 mi) SSE of Tibigan, Philippines
22 km (13 mi) NE of Tagbilaran, Philippines
35 km (21 mi) NE of Danao, Philippines
629 km (389 mi) SSE of Manila, Philippines



Magnitude 7.4 quake hits Philippines, no tsunami threat

SYDNEY | Mon Oct 14, 2013 8:35pm EDT
(Reuters) - An earthquake with a preliminary magnitude of 7.4 hit the southern Philippines on Tuesday, the U.S. Geological Survey said.

The Pacific Tsunami Warning Center in Hawaii said there was no threat of a Pacific-wide tsunami after the quake.

The quake struck at a depth of about 35 km (22 miles) around Bohol island, to the north of Mindanao island.

http://abcnews.go.com/International/wireStory/72-quake-hits-central-philippines-killing-20571302

A 7.2-magnitude earthquake struck in the central Philippines on Tuesday morning, collapsing roofs and buildings, cracking walls and roads and killing at least four people.

The quake was centered 56 kilometers (35 miles) deep below Carmen town on Bohol Island and was felt across the region.

Radio station DZMM quoted civil defense officials as saying that four people died when part of a fish port collapsed in nearby Cebu city, across the strait from Bohol.

The roof of a market in Mandaue in Cebu province also collapsed, injuring 19 people, according to TV reports. People rushed out of buildings and homes, including hospitals as aftershocks continued.

Photos from Cebu broadcast on TV stations showed a fallen concrete 2-story building, and reports said two people were pulled alive, including an 8-month-old baby.

Bohol Gov. Edgardo Chatto said that a church was reported damaged in the provincial capital of Tagbilaran and a part of the city hall collapsed, injuring one person.

Earthquakes are common in the Philippines, which lies along the Pacific "Ring of Fire."

Cebu province, about 570 kilometers (350 miles) south of Manila, has a population of more than 2.6 million people. Nearby Bohol has 1.2 million people and is popular among foreigners because of its beach and island resorts.

M6.4 - GULF OF CALIFORNIA

Preliminary Earthquake Report
Magnitude 6.4
Date-Time
19 Oct 2013 17:54:56 UTC
19 Oct 2013 10:54:56 near epicenter
19 Oct 2013 11:54:56 standard time in your timezone
Location 26.271N 110.178W
Depth 1 km
Distances
74 km (45 mi) SW of Etchoropo, Mexico
82 km (50 mi) SW of Huatabampo, Mexico
99 km (61 mi) SSW of Villa Juarez, Mexico
106 km (65 mi) WNW of Ahome, Mexico
816 km (505 mi) SSE of Phoenix, Arizona