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Thu, 17 Oct 2019
The World for People who Think



Magnitude 6.6 quake strikes southern Mexico

A magnitude 6.6 earthquake struck Mexico's southern state of Chiapas on Friday, the U.S. Geological Survey (USGS) said, with the quake being felt as far away as El Salvador.

An official with emergency services in Chiapas said that he felt the quake but that he did not see any immediate damage. A Reuters witness said the quake was felt in San Salvador.

The epicenter of the quake hit at a depth of 42 miles (68 km) near the Pacific coast and Mexico's border with Guatemala, according to the USGS.

There were no immediate reports of major damage in Mexico City, though some people evacuated office buildings.

Source: Reuters


6.2-magnitude earthquake strikes off Fiji island

A 6.2-magnitude earthquake hit near the Pacific island nation of Fiji just before 8:00 local time (2:30 am IST) on Sunday, the US Geological Survey said.

Shortly after, the area felt another smaller tremor, which registered 5.2 magnitude.

The earthquakes hit just south of the island between Fiji and Tonga, and were detected at a depth of over 500 km.

So far, there has been no tsunami alert issued by the Pacific Tsunami Warning Center.

Source: Indo-Asian News Service


Earthquake: 6.2 quake strikes near Taro, Solomon Islands

A deep magnitude 6.2 earthquake was reported Friday evening 22 miles from Taro, Solomon Islands, according to the U.S. Geological Survey. The temblor occurred at 7:51 p.m. Pacific time at a depth of 221.8 miles.

According to the USGS, the epicenter was 73 miles from Arawa, Papua New Guinea.

In the last 10 days, there have been no earthquakes of magnitude 3.0 or greater centered nearby.

This information comes from the USGS Earthquake Notification Service and this post was created by an algorithm written by the author.

map quake


Deep quakes reveal that magma is moving beneath an ancient German volcano

Laacher See caldera
Laacher See caldera, as seen today.
When it comes to active volcanoes, what country first comes to mind? Japan, perhaps? The US? What about Italy? These are all excellent examples, and understandably so. They have a wide range of fiery mountains that, at some point in the last 12,000 years, have erupted - a condition that, per the United States Geological Survey, makes them "active."

It's easy to forget that plenty of once-prolific volcanoes around the world have long fallen silent; geologically tame countries were often once replete with effusive or explosive eruptions. Just take Germany's Laacher See Volcano (LSV), found in the Eifel mountain range within the Rhineland-Palatinate state. This lake-filled cauldron ("caldera") is a rather serene site today, but it was originally forged out of fury. Around 12,900 years ago, a cataclysmic eruption, one that coated plenty of Europe in ash, was responsible for creating the crater-like edifice that we can see there today.

Make no mistake: coming in at a 6 on the Volcanic Explosivity Index (VEI), which tops out at 8, this was an unmistakably huge eruption. Today, according to Volcano Discovery, it's the only caldera in Central Europe, which means that in the last 12-13,000 years, this part of the world has never seen an eruption as powerful as the one that formed LSV.

Its days of volcanism aren't necessarily done and dusted, though. A new study, published in Geophysical Journal International, reveals that there are some curious rumblings going on beneath LSV. These specific tremors, known as deep low-frequency earthquakes, are a clear sign that magmatic fluids are on the move.

That's certainly noteworthy. The East Eifel Volcanic Field, of which LSV is part of, hasn't experienced an eruption for roughly 12,000 years, so the movement of magma beneath the surface is something that volcanologists are keen to document and comprehend.


USGS: 6.7-magnitude earthquake hits Prince Edward Islands region

© Google, EMSC, TW/SAM
An earthquake of magnitude 6.7 jolted Prince Edward Islands region at 19:01:43 GMT on Tuesday, Trend reports citing Xinhua.

The epicenter, with a depth of 10 km, was initially determined to be at 43.0778 degrees south latitude and 42.2262 degrees east longitude.


USGS: Magnitude 6.6 earthquake strikes off Indonesia's Sumbawa

Indonesia earthquake
An earthquake of magnitude 6.6 struck south of the Indonesian town of Raba, off the central island of Sumbawa, the U.S. Geological Survey said, the second quake to hit the area on Tuesday.

There was no immediate tsunami warning or reports of damage or casualties from the quake, which hit at a depth of 36 km (22 miles), at a distance of about 230 km (143 miles) south of Raba in the east of the island, which forms part of West Nusa Tenggara province.

The quake followed one of magnitude 6 that struck in the same area.

Reporting by Clarence Fernandez; Editing by Robert Birsel


7.0 earthquake strikes near Anchorage, Alaska, heavy damage reported - UPDATE - Over 7,800 aftershocks

Earthquake in southcentral Alaska
© Loren Holmes/ADN
The northbound onramp for International Airport Rd. at Minnesota Blvd. collapsed Friday morning, Nov. 30, 2018 after a strong earthquake shook southcentral Alaska.
A magnitude 7.0 earthquake struck Friday morning near Anchorage, Alaska, causing widespread damage, triggering rock slides and alarming office workers who plunged under their desks.

Residents are reporting damage in the nearby areas via social media. One man tweeted a photo of his toppled chimney and a local television station showed its studio filled with debris. Former Alaska governor and vice presidential candidate Sarah Palin tweeted, saying her family is intact but her "house is not."

"This is a large earthquake and there have been numerous aftershocks," said John Bellini, a geophysicist for the U.S. Geological Survey. He said the largest aftershock was a 5.7 magnitude quake about six minutes after the big one.

The quake struck at 8:29 a.m. local time about seven miles north of Anchorage, the USGS reported. There were no immediate reports of injuries or deaths. Officials have since canceled a tsunami warning for coastal areas of southern Alaska.

Comment: UPDATE December 3rd

Anchorage Daily News reports that small aftershocks have continued with 1,800 measured between last Friday and Monday. A total of 153 measured greater than 3.0, 18 were at 4.0 or greater and five were greater than 5.0, according to the Alaska Earthquake Center.

Alaska Earthquake aftershocks 11.30.18
© Alaska Earthquake Center.
Earthquakes associated with Friday's 7.0 earthquake north of Anchorage as of 5:45 p.m. Sunday. The red dots represent shakes in the previous 24 hours, and the yellow dots are from the past week (with virtually all of them since Friday. The large dot directly north of the city was Friday's quake).
UPDATE January 19, 2019

Residents in Alaska are still reporting aftershocks from the event:
The latest big aftershock happened last Sunday - a magnitude 5.0 jolt that flared already frayed nerves and prompted panicky posts on social media.

That one "reminded people again that it's not over yet," said seismologist Natalia Rupert at the Alaska Earthquake Center.

There have been more than 7,800 aftershocks since the main earthquake struck 7 miles (11 kilometers) north of Anchorage, the state's most populous city. Most were too small to feel, but 20 have had magnitudes of 4.5 or greater. Rupert expects the temblors to continue for months, although the frequency has lessened, from about 200 daily to a couple dozen a day.


Two dead as strong 6.7-magnitude earthquake jolts Chile

People outside their houses
© Reuters/Alejandro Pizarro
People outside their houses are seen along a street after an earthquake in Coquimbo, Chile on Jan. 19, 2019.
A strong 6.7-magnitude earthquake hit north-central Chile on Saturday, the US Geological Survey said, with police reporting the deaths of two people from heart attacks.

The quake struck at a depth of 53 kilometers (33 miles) with an epicenter some 15 km southwest of Coquimbo, USGS said.

An elderly man and an elderly woman from Coquimbo suffered cardiac arrests as a result of the quake, police said, while there were several landslides reported on national highways.


6.0-magnitude quake hits 76 km WNW of Isangel, Vanuatu

An earthquake measuring 6.0 on the Richter scale jolted 76 km WNW of Isangel, Vanuatu at 13:18:32 GMT on Friday, the U.S. Geological Survey said.

The epicenter, with a depth of 45.06 km, was initially determined to be at 19.2079 degrees south latitude and 168.6329 degrees east longitude.

Comment: A magnitude 6.8 quake hit the same region 3 days prior to the above event.


Shallow magnitude-6.0 earthquake registered near Mexican Pacific Coast

The 6.0-magnitude earthquake was registered on Friday near the Mexican Pacific coast, the US Geological Survey (USGS) said.

The tremors hit the Northern East Pacific Rise at 16:40 GMT, 1,026 kilometers (about 640 miles) northeast the Mexican city of Acapulco.

The epicenter of the earthquake was located at the depth of 10 kilometers.

There are no reports about any injured, or killed people by the earthquake. No tsunami alert has been declared.

The Mexican Pacific coast is located in the so-called Ring of Fire, a seismically active zone that is often hit by powerful earthquakes.