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Earthquakes

Seismograph

3.5 magnitude earthquake hits Pawnee, Oklahoma; site of last months record-setting temblor

Graph
© Dimas Ardian, Getty Images
A 3.5-magnitude earthquake struck northern Oklahoma on Tuesday morning, hitting the same spot where a record-setting temblor was centered a month ago.

The U.S. Geological Survey says Tuesday's earthquake hit shortly after 4 a.m. with an epicenter about 10 miles northwest of Pawnee, or about 75 miles northeast of Oklahoma City. There are no reports of damage or injury.

On Sept. 3, Oklahoma's strongest earthquake on record struck Pawnee and was felt widely throughout the central United States. Scientists later said the 5.8-magnitude quake led to the discovery of a new fault line, leading to worries that oil and gas production could trigger more powerful earthquakes.

Scientists have linked Oklahoma's sharp increase in earthquakes in recent years to the underground injection of wastewater during oil and gas production.

Comment: 5.6 magnitude earthquake, strongest in state history, rattles Oklahoma early Saturday - revised to 5.8! (UPDATE)


Seismograph

Fears of Teide volcano eruption after 'abnormal' earthquake swarm hits Tenerife

Tenerife earthquake swarm
© INVOLCAN
92 microquakes were recorded in Adeje and Vilaflor in the space of four hours on Sunday October 2

FEARS are mounting that a huge volcano on the island of Tenerife could erupt after nearly 100 mini earthquakes were reported in FOUR HOURS in the region


The Volcanology Institute of the Canary Islands (Involcan) reported a significant spike in seismic activity on Sunday afternoon.

Some 92 microquakes were recorded in Adeje and Vilaflor in the space of four hours, with one measuring more than 1.5 on the Richter scale.

The majority of the quakes took place between 7 and 13km below ground sparking fears Mount Teide could be about to blow.

Involcan has sent teams to the area to measure the amount of carbon dioxide in the atmosphere following the quakes, which they described as a "seismic swarm" which is "abnormal" for the region.

An increase in carbon dioxide is said to be an early indicator of volcanic earthquake activity that can precede an eruption.

Involcan said in a statement: "We are registering an important seismic rally on the island of Tenerife.

"In principle, these earthquakes are very low magnitude, consistent with those that occur in active volcanoes.

"The number of earthquakes is provisional pending the analysis of the signals more closely, but we can qualify this activity as a seismic swarm whose pattern is an alignment with prevailing direction northeast to southwest ".

Seismograph

Shallow 5.7 magnitude earthquake recorded off Ilocos, Philippines

Graph
© Dimas Ardian, Getty Images
5.7 magnitude earthquake 4 km from Balingasay, Ilocos, Philippines
about 5 hours ago

UTC time: Sunday, October 02, 2016 13:40 PM

Your time: Sunday, October 2 2016 2:40 PM

Magnitude Type: mb

USGS page: M 5.7 - 11km WNW of Balingasay, Philippines

USGS status: Reviewed by a seismologist

Reports from the public: 19 people

about 5 hours ago 5.7 magnitude, 10 km depth

Balingasay, Ilocos, Philippines

Seismograph

Southern California under heightened earthquake alert

Salton Sea

A series of small temblors occurred deep under the Salton Sea

Southern California residents should remain on heightened alert until Tuesday for the increased possibility of a major earthquake, officials said.

The warning by the Governor's Office of Emergency Services follows a series of small temblors deep under the Salton Sea, which is located on the 800-mile-long San Andreas fault, the Orange County Register reported Saturday.

Such warnings are typically issued once or twice a year, said Kelly Huston, the deputy director of criss communications for the Governor's Office of Emergency Services.

The latest alert was issued after 142 temblors hit starting Monday near Bombay Beach at the southern end of the fault. Those quakes ranged from a magnitude of 1.4 to 4.3, the U.S. Geological Survey said.

Seismograph

USGS: Alaska hit by 5.2 magnitude earthquake

Alaska
© Flickr/ Joseph

An earthquake measuring 5.2 on the Richter scale struck off the Alaskan coast on Sunday, the US Geological Survey (USGS) reported.

The quake occurred at 22:07 GMT on Saturday at a depth of 20.9 kilometers (about 13 miles), 236 kilometers (147 miles) south of False Pass, a city in the Aleutian Islands, Alaska, according to the USGS. No information on casualties or damage from the quake has been provided yet.

Seismograph

Shallow 5.2 magnitude earthquake recorded off the Azores

Graph
© Dimas Ardian, Getty Images
5.2 magnitude earthquake

about 5 hours ago

UTC time: Saturday, October 01, 2016 13:17 PM

Your time: Saturday, October 1 2016 2:17 PM

Magnitude Type: mb

USGS page: M 5.2 - 210km NE of Santa Cruz das Flores, Portugal

USGS status: Reviewed by a seismologist

Reports from the public: 0 people

about 5 hours ago 5.2 magnitude, 10 km depth

Azores Islands

Seismograph

Magnitude 5.4 earthquake strikes Pakistan, tremors felt in Kashmir Valley

 earthquake with a magnitude of 5.4 struck Pakistan 1st October 2016

An earthquake with a magnitude of 5.4 struck Pakistan.
An earthquake with a magnitude of 5.4 struck Pakistan at 0804 GMT, 117 km east of the Swat Valley city of Mingaora, at a depth of 43.4 km, the US Geological Survey said.

Minor tremors were felt in Kashmir Valley too.

No loss to life or property has been reported so far.

The quake shook the capital Islamabad, parts of Khyber-Pakhtunkhwa (KP) province in the north-west and some northern areas of Punjab.

Seismograph

Katla volcano continues to tremble in Iceland with over 200 tremors in 24 hours

Katla volcano.
© Páll Stefánsson.
Katla volcano.
Seismic activity in Katla volcano, South Iceland, continues. No less than 200 tremors have registered there in the past 24 hours, Vísir reports. Three quakes in excess of magnitude 3 hit the volcano overnight, the largest one at 4:41 am, of magnitude 3.7. It was preceded by another one of magnitude 3.1 a minute earlier. The third one measured 3.2 at 2:43 am. All three were shallow. Sigurdís Björg Jónasdóttir, natural hazard specialist at the Icelandic Met Office, reported that the seismic activity was constant all night long.

"It's been very lively in Katla overnight, but the tremors are all shallow, and there hasn't been any eruption activity or glacial outburst flood activity, so those of us who are on call are relatively calm, since the situation effectively hasn't changed since yesterday," Sigurdís stated.

Katla volcano is located under the icecap of Mýrdalsjökull glacier. It last erupted in 1918, but has, on average, erupted twice a century.

Seismograph

USGS: 5.3 magnitude earthquake strikes off Tonga's coast

Tonga
A magnitude 5.3 earthquake has occurred off the coast of Tonga in the South Pacific, the US Geological Survey (USGS) reports.

The quake occurred at 00:33 GMT on Saturday at a depth of 57.6 kilometers (about 36 miles), 246 kilometers (153 miles) south of Ohonua, the largest settlement on Tonga's 'Eua island, USGS said.

There appeared to be no tsunami threat following the earthquake and there were no immediate reports of any damages or casualties.

Seismograph

Recent earthquake swarm under California's Salton Sea could lead to massive earthquake on San Andreas fault

san andreas fault
© U.S. Geological Survey
A view of the San Andreas fault in the Carrizo Plain. A valley is deeply eroded along the fault
The rumbling started Monday morning deep under the Salton Sea. A rapid succession of small earthquakes — three measuring above magnitude 4.0 — began rupturing near Bombay Beach, continuing for more than 24 hours. Before the swarm started to fade, more than 200 earthquakes had been recorded.

The temblors were not felt over a very large area, but they have garnered intense interest — and concern — among seismologists. It marked only the third time since earthquake sensors were installed there in 1932 that the area had seen such a swarm, and this one had more earthquakes than the events of 2001 and 2009.

The quakes occurred in one of California's most seismically complex areas. They hit in a seismic zone just south of where the mighty San Andreas fault ends. It is composed of a web of faults that scientists fear could one day wake up the nearby San Andreas from its long slumber.
cali earthquake swarm
© Caltech seismologist Egill Hauksson
An image provided by Caltech seismologist Egill Hauksson shows the earthquake swarms of 2001, 2009 and 2016 in the Salton Sea. Scientists worry that earthquakes near the southern end of the San Andreas fault could trigger a large earthquake on California's longest fault
The San Andreas fault's southernmost stretch has not ruptured since about 1680 — more than 330 years ago, scientists estimate. And a big earthquake happens on average in this area once every 150 or 200 years, so experts think the region is long overdue for a major quake.

Comment: Many experts believe the San Andreas fault is long overdue for a potentially catastrophic earthquake: