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Update: Seventeen Earthquakes Shake Greenbrier, Arkansas Wednesday

Click here to watch the video.

People who live in northern Faulkner County are feeling the ground shake again.

Seventeen earthquakes happened in the Greenbrier area Wednesday between 3:30 in the morning and 11:05 in the evening. The strongest of those registered 3.5 on the Richter Scale. The second strongest was a 2.9 tremor.

There have been dozens of quakes since Monday around Greenbrier according to the United States Geological Survey (USGS). Click here for more information.

According to Wikipedia, earthquakes that register 2.0 to 2.9 in magnitude are classified as minor and are generally not felt. There are about 1,000 of these everyday around the world.

Those that measure 3.0 to 3.9 are also classified as minor. They are often felt, but rarely cause damage and there are 49,000 of them around the world daily.


US: Swarm of Unexplained Earthquakes Strikes Arkansas

© USGS Real-time Earthquake Monitor
Arkansas has been hit with more than 30 earthquakes since Sunday.
Jim Sutterfield was briefly puzzled by a thumping sound that seemed to slam the back of his office chair. But when the small-town Arkansas fire chief turned and saw no one was around, he quickly realized it was just an earthquake - again.

"That was only my second time to feel one, but others here have felt them for three or four months now," Greenbrier chief Jim Sutterfield said after feeling the latest tremor on Wednesday. "Now when it happens, people say, 'Well, there's another one.'"

Several small earthquakes ranging in magnitude from 1.8 to 3.8 have rattled the north-central Arkansas cities of Greenbrier and Guy this week, and the cause is unknown.

The U.S. Geological Survey has reported more than 30 earthquakes in the area since Sunday, including a magnitude 3.8 quake Thursday morning and at least 16 others occurring Wednesday, two of which were magnitude 3.2 and 3.5. More than 700 quakes have occurred in the region over the past six months.

Scott Ausbrooks, geohazards supervisor for the Arkansas Geological Survey, said the quakes are part of what is now called the Guy earthquake swarm - a series of mild earthquakes that have been occurring periodically since 2009. A similar swarm occurred in the early 1980s when a series of quakes hit Enola, Ark.

Bizarro Earth

Philippines: 7 volcanic quakes recorded at Taal

© Unknown
Taal Volcano in Batangas province showed renewed activity on Wednesday, with state volcanologists recording at least seven quakes in the last 24 hours.

In its Thursday report, the Philippine Institute of Volcanology and Seismology reiterated Taal's main crater remains off limits to the public.

"Alert Level 1 is still enforced over Taal Volcano. This means that a hazardous eruption is not imminent. However, the public is reminded that the main crater should be strictly off-limits due to sudden occurrence of steam explosions and accumulation of toxic gases," Phivolcs said on its website.

It added that the northern portion of the main crater rim, in the vicinity of Daang Kastila trail, may also be dangerous when increased steam emission is reactivated along existing fissures.

Phivolcs also reminded the public that the entire Volcano Island is a Permanent Danger Zone (PDZ), and permanent settlement in the island is strictly not recommended.

See the complete table on the Phivolcs website.

Bizarro Earth

US: Earthquake Magnitude 4.0 - Arkansas

Friday, February 18, 2011 at 04:59:50 UTC

Thursday, February 17, 2011 at 10:59:50 PM at epicenter

Time of Earthquake in other Time Zones

35.257°N, 92.370°W

5.1 km (3.2 miles)


4 km (2 miles) NNE (29°) from Greenbrier, AR

8 km (5 miles) SE (143°) from Twin Groves, AR

8 km (5 miles) SSW (203°) from Guy, AR

58 km (36 miles) N (357°) from Little Rock, AR

420 km (261 miles) SSW (207°) from St. Louis, MO

Bizarro Earth

USGS Watching Mount St. Helen's Volcano Following Earthquake Swarm

© Unknown
The United States Geological Survey is watching the Mount St. Helen's volcano closely after a series of earthquakes struck on Monday. The area around Mount St. Helen's in Washington state has been experiencing minor earthquakes since an initial quake measuring 4.3 in magnitude struck around 10:35 a.m. local time, according to the USGS. Since that first quake, several smaller aftershocks were registered ranging between 1.0 and 2.8 in magnitude.

All of these earthquakes were centered in an area approximately five to six miles north of the Mount St. Helen's crater near the Johnston Ridge Observatory. The quakes were registered at depths between 1.7 and 3.7 miles. In total, at least 12 small earthquakes were registered in the area since the first quake on Monday.

This series of small earthquakes occurring in approximately the same location over a short period of time is known as an earthquake swarm. According to the Global Volcanic Earthquake Swarm Database earthquake swarms are especially common around volcanoes and are often reliable methods of predicting an eruption but the Alaska Volcano Observatory website offered that there may be no need for alarm. The AVO website explained that while earthquake swarms may offer information that a volcano is becoming restless, they are not necessarily indicators of a pending eruption. According to the AVO, "Most seismic swarms are not precursors to eruptions."


US: 4.3 Magnitude Earthquake Hits Near Mt. St. Helens

A 4.3 earthquake hit the Mt. St. Helens area about 10:35 a.m. Monday, followed by 30 aftershocks, according to a USGS seismologist.

USGS Seismologist Seth Moran told KGW the quake was centered near the Johnston Ridge Observatory, and registered on seismic devices as far away as Mt. Rainier and at Timberline Lodge.

Moran said the seismic event lasted about three to five seconds, and shaking from the quake lasted up to three minutes. He said there were at least 30 aftershocks.

USGS data on the 4.3quake

The 4.3 quake (pictured on the seismograph), originally rated as only a 3.3 magnitude event, happened at 10:35 a.m., about six miles north and northwest of the volcano and about three miles deep.

Bizarro Earth

Indonesia - Earthquake Magnitude 6.1 - Sulawesi

Sulawesi Quake_150211
Earthquake Location
Tuesday, February 15, 2011 at 13:33:53 UTC

Tuesday, February 15, 2011 at 09:33:53 PM at epicenter

Time of Earthquake in other Time Zones

2.470°S, 121.541°E

20.6 km (12.8 miles)


160 km (100 miles) ENE of Palopo, Sulawesi, Indonesia

200 km (125 miles) NNW of Kendari, Sulawesi, Indonesia

1500 km (930 miles) NW of DARWIN, Northern Territory, Australia

1680 km (1040 miles) ENE of JAKARTA, Java, Indonesia


US: Quakes hit Mt. St. Helens, rattle Portland area

Portland, Oregon - Two earthquakes hit the Mount St. Helens area Monday morning, and one was strong enough to be felt in the Portland-Vancouver area.

KATU received many reports from viewers in the Portland area who said they felt the 10:35 a.m. temblor.

The initial quake measured 3.5 and was followed by a 2.5., but then the first quake was re-evaluated as a 4.3 - a fairly robust temblor. A 2.3 aftershock struck just before noon.

Quakes are now measured on a "magnitude scale" instead of the Richter Scale, according to KATU News Meteorologist Dave Salesky.

Bizarro Earth

Chile Feels Aftershocks of Last Year's Massive Temblor

Chilean Quake Aftermath
© Science/AAAS
Last year's huge earthquake raised Chile's coast. The quake is still sending aftershocks through the region.
With five earthquakes rattling the coast over the past four days, Chileans are still feeling the aftershocks of a huge earthquake that ruptured one year ago.

A magnitude 6.8 earthquake offshore of Bío-Bío, Chile, on Feb. 11 sent thousands running for higher ground, the Associated Press reported. That quake triggered at least two dozen aftershocks, including earthquakes of magnitudes 6.0, 5.8 and 5.6, according to the U.S. Geological Survey (USGS). The rumbling continued today with a magnitude 6.6 temblor underwater near Maule, Chile.

"Chile is an active place so we always have a lot of earthquakes going on," said Don Blakeman, a geophysicist with the USGS in Golden, Colo.

That seismic activity is created as one of the Earth's rocky plates dives under another one. Near Chile, the Nazca plate is thrust under the much larger South American plate at a rate of about 2 inches (6 centimeters) per year.

Friday's magnitude 6.8 quake is thought to be an aftershock from the devastating magnitude 8.8 earthquake that struck Concepcion, Chile, last year, said Michael Bevis, a geophysicist at Ohio State University, who has studied how the earthquake last year changed Chile's coast. [See images of Chile's raised coast.]

"That's a huge earthquake, so it's going to have more aftershocks that last longer," than other, smaller earthquakes, Bevis told OurAmazingPlanet.

Bizarro Earth

US: Earthquake Magnitude 4.3 - Mount St. Helen's Area

Monday, February 14, 2011 at 18:35:25 UTC

Monday, February 14, 2011 at 10:35:25 AM at epicenter

Time of Earthquake in other Time Zones

46.279°N, 122.215°W

5 km (3.1 miles) set by location program


9 km (6 miles) NNW (343°) from Mount St. Helens Volcano, WA

31 km (20 miles) S (171°) from Morton, WA

35 km (22 miles) SE (143°) from Mossyrock, WA

59 km (37 miles) ENE (75°) from Longview, WA

78 km (48 miles) NNE (23°) from Vancouver, WA