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Sat, 16 Feb 2019
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Earthquakes


Seismograph

Shallow 6.2 magnitude earthquake hits northern Mid-Atlantic Range

earthquake
An earthquake measuring 6.2 on the Richter Scale struck northern Mid-Atlantic Range region on Thursday (local time).

The quake hit at a depth of 10 km and took place at 7:57 pm, according to United States Geological Survey (USGS).

No tsunami warning has been issued so far.

The Mid-Atlantic Ridge is a mid-ocean ridge located along the floor of the Atlantic Ocean.

In the North Atlantic, the ridge separates the Eurasian and North American plates, and in the South Atlantic, it separates the African and South American plates.

Source: ANI

Seismograph

Deadly Indonesian earthquake was rare ultra-powerful supershear event

Indonesian earthquake in 2018
© Dita Alangkara/AP/REX/Shutterstock
A seismic boom contributed to the devastation of the Indonesian earthquake in 2018.
The Indonesian earthquake that impacted Sulawesi island in September 2018 was a rare ultra-powerful, superfast supershear event, according to new research out of NASA, UCLA, and more. The 7.5-magnitude earthquake caused an unexpected tsunami, the disaster ultimately claiming more than 1,500 lives and causing extreme damage. Using satellite images, researchers determined that the 7.5 Palu quake was one of fewer than 15 known supershear events.

The earthquake struck on September 28, 2018, with a steady rupture speed of 9,171MPH, according to NASA, which says the primary shock lasted for nearly one minute. This was an unusually fast speed compared to the typical 5600 to 6700MPH speeds most earthquakes present. In addition, and thanks to satellite images, the researchers found that the earthquake resulted in the fault - measuring 93 miles in length - had slipped by around 16ft.

The supershear event's rapid speed caused stronger shaking on the ground than would have resulted from a slower earthquake. Helping put this into perspective, the study's co-author Lingsen Meng explained via NASA, "The intense shaking is similar to the sonic boom associated with a supersonic jet."

Bizarro Earth

Seismic swarm in progress between southern Cascadia and northern San Andreas Faults

San Andreas and Cascadia Faults
© Temblor
Four Magnitude-3.4 and larger quakes have struck in two hours, all south of Cape Mendocino, and west of the town of Petrolia, California. Based on the earthquake locations and their focal mechanisms (both by the USGS), the swarm appears to be occurring on a right-lateral reverse fault that connects the northernmost San Andreas-Mendocino Fracture Zone with the shallow portion of the Cascadia Megathrust (as shown by the black half- arrows in the map).

Seismograph

Powerful earthquake hits Afghanistan-Pakistan region, tremors felt in Delhi - UPDATE

earthquake afghanistan pakistan 2019
© CSEM
Strong tremors were felt across North India, the first being reported from Delhi-NCR and Jammu and Kashmir's Poonch district.

A powerful 6.1 magnitude earthquake jolted Afghanistan, Pakistan and parts of North India on Saturday evening. Strong tremors were felt across North India, the first being reported from Delhi-NCR and Jammu and Kashmir's Poonch district.

The Indian Meteorological Department (IMD) said the epicentre of the quake was Hindu Kush, which is a mountain range that stretches near the Afghan-Pakistan border, from central Afghanistan to northern Pakistan.

Comment: The Hindu reports:
In Pakistan's Quetta town, one girl was killed after the roof of her house collapsed in the earthquake. Deputy Commissioner Shabir Mengal said there were also incidents in other parts of Quetta, resulting in injuries to a dozen people.

He said some villages in Balochistan province also felt the tremors. "The injured have been rushed to a nearby hospital for treatment. Emergency has been declared in all hospitals."

Rescue teams were also dispatched to the nearby Khyber Pakhtunkhwa province to assess reports of damage. However Pakistan's National Disaster Management Authority did not expect serious losses, a spokesman said.



Seismograph

Strong shallow 6.1-magnitude quake rocks western Indonesia

map quake
A strong 6.1-magnitude earthquake struck off the Indonesian island of Mentawai on Saturday (Feb 2), but no tsunami warning was issued.

The earthquake hit at a depth of 10km in the Mentawai island region in West Sumatra province, about 100km south-east of the town of Tuapejat and 200km south of the major port city of Padang, according to the USGS.

Officials are still assessing the impact but there were no immediate reports of damage and casualties.

"The quake was felt very strongly in Tuapejat. Our officers are still assessing the impact but so far everything is safe," said the head of Mentawai search and rescue agency Akmal, who like many Indonesians goes by one name.

Seismograph

Magnitude 6.6 quake strikes southern Mexico

earthquake
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

Seismograph

6.2-magnitude earthquake strikes off Fiji island

earthquake
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

Seismograph

Earthquake: 6.2 quake strikes near Taro, Solomon Islands

earthquake
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

Seismograph

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

Laacher See caldera
© DF1PAW/WIKIMEDIA COMMONS; CC BY-SA 4.0
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.

Seismograph

USGS: 6.7-magnitude earthquake hits Prince Edward Islands region

Earthquake
© 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.