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Thu, 25 Apr 2019
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Earthquakes


Seismograph

Strong 6.1 magnitude earthquake hits Arunachal Pradesh, India

Earthquake seismograph
A strong 6.1-magnitude earthquake struck India's northeastern state of Arunachal Pradesh early Wednesday, the US Geological Survey said.

The epicenter of the shallow quake was about 40 kilometres (25 miles) southeast of Along, and 180 kilometres southwest of the state capital Itanagar.

It struck at 1.45 am (2015 GMT Tuesday). Arunachal Pradesh is India's least densely populated state, but is still home to more than 1.2 million people, according to the state government's website.

China's official state news agency Xinhua said the quake was felt in Tibet, which neighbors the Indian state. New Delhi and Beijing for decades have disputed control of Arunachal Pradesh -- a dispute that remains unresolved. India considers Arunachal Pradesh one of its northeastern states, while China claims about 90,000 square kilometres (34,750 square miles) of the territory.

Arunachal Pradesh also borders Myanmar and Bhutan. USGS estimated there was a "low likelihood" of casualties and damage from the quake.

Seismograph

Scientists have identified almost 2 million 'hidden' earthquakes shaking California

Earthquake crack
© SteveCollender/iStock
California is notorious for its earthquakes, but a stunning new discovery reveals for the first time just how much we've underestimated its omnipresent earth-shaking potential.

By the time you just about finish reading this story, in fact, Southern California will probably have experienced another quake - based off a new, unprecedented deep dive into 10 years' worth of seismic data, which isolated almost 2 million 'hidden' tremors in the region that scientists had never identified before.

For decades, scientists suspected these invisible, smaller quakes existed, but had no way of singling them out from other random vibrations created by things like vehicle traffic, construction projects, weather events, and more.

"It's not that we didn't know these small earthquakes were occurring," says geophysicist Zachary Ross from Caltech.

"The problem is that they can be very difficult to spot amid all of the noise."


Seismograph

At least 11 killed as strong shallow 6.3 magnitude earthquake hits Luzon, Philippines - UPDATES

A strong 6.3-magnitude earthquake struck the Philippines island of Luzon on Monday afternoon
© European-Mediterranean Seismological Centre
A strong 6.3-magnitude earthquake struck the Philippines island of Luzon on Monday afternoon, the US Geological Survey said.
A strong 6.3-magnitude earthquake struck the Philippines island of Luzon on Monday afternoon, the US Geological Survey said.

The quake struck at 5.11pm local time (0911 GMT) at a shallow depth of 40 kilometers (25 miles).

AFP reporters in the capital city Manila said central offices were evacuated and buildings were shaking.

There were no immediate reports of injuries or damage.

The Philippines is part of the Pacific "Ring of Fire," an arc of intense seismic activity that stretches from quake-prone Japan through Southeast Asia and across the Pacific basin.


Comment: Update 18:00 CET

RT reports that 5 people were killed:
Three people were crushed by a collapsed building in the town of Porac, according to provincial governor Lilia Pineda. Two others victims, an elderly woman and her grandchiled, were killed in a building collapse in the town of Lubao.
Update 21:00 CET

The latest report by Reuters via The Star has at least 8 now dead:
At least eight people were killed when a magnitude 6.1 earthquake struck the Philippines' main island of Luzon on Monday and officials feared dozens could be trapped in the rubble of a collapsed commercial building.

The quake hit 60 km (37 miles) northwest of the capital, Manila, disrupting air, rail and road transport and causing some damage to buildings and infrastructure.

The province of Pampanga was worst hit. Eight people were killed and about 20 injured, provincial governor Lilia Pineda said by telephone, citing information from disaster officials.

Rescuers were using heavy duty equipment and search dogs to try to reach people trapped after a four-storey building went down, crushing the ground-floor supermarket, she said. [...]

Pampanga's international airport at Clark, a former U.S. military base, was closed and scores of flights were cancelled after damage to parts of the facility including check-in areas.

Large cracks appeared on provincial roads and electricity poles were felled.

Rescue teams in Manila were preparing to reinforce efforts to reach people trapped in Pampanga. The government urged people to be calm as rumours of greater death and destruction gained traction online.

"We urge them to refrain from spreading disinformation in social media that may cause undue alarm, panic and stress," said presidential spokesman, Salvador Panelo.

In Manila, the quake, shortly after 5 p.m., caused tall buildings to sway for several minutes in the main business districts.

"We got nervous, we got dizzy. I ran downstairs with three kids," said Arlene Puno, a domestic helper in a high-rise apartment in the Makati financial centre.

Elevated rail services were halted and workers were evacuated from offices and condominiums, sending a flood of people onto sidewalks and into bus queues and adding more chaos to roads that are among the world's most congested. [...]

Mark Genesis Samodio, 23, a maintenance worker at a Makati condominium in the capital, said the quake's impact was unusual, even for a city that has grown used to them.

"I was sitting down then it shook so strong I thought I was being rocked in a cradle," he said.

Update: The New York Times reports on the 22nd of April:
A powerful earthquake shook the northern Philippines on Monday, leaving at least 11 people dead in collapsed buildings, municipal and disaster relief officials said.

The Philippine Institute of Volcanology and Seismology said the quake had registered a magnitude of 6.1 and had been centered near the town of Castillejos in Zambales Province, west of Manila. It struck shortly after 5 p.m., as government offices and private businesses were closing for the day.

In the town of Porac, northwest of Manila, five people were reported crushed to death after a wall in a four-story supermarket collapsed, RJ Mago, a spokesman for the National Disaster Risk Reduction and Management Council, told a local radio station.



Seismograph

New 6.3 magnitude earthquake hits Philippines a day after earlier one kills at least 11

quake
The U.S. Geological Survey says a magnitude 6.3 earthquake has hit the central Philippines, a day after 6.1 quake hit the country's north and killed at least 11 people.

The new quake hit Tuesday afternoon and was centered 13 kilometers (8 miles) east of Tutubigan in the country's central region. The quake was relatively deep at 70.2 kilometers (43 miles).

A supermarket crashed down in Monday's powerful earthquake, which damaged buildings and an airport in the northern Philippines. The death toll is now 11, with more missing.

Source: AP

Comment: Details of the earlier event: At least 11 killed as strong shallow 6.3 magnitude earthquake hits Luzon, Philippines - UPDATES


Seismograph

Shallow 6.5 magnitude earthquake hits Western Indian Antarctic Ridge

chart
Magnitude Type: mww

USGS page: M 6.5 - Western Indian-Antarctic Ridge

USGS status: Reviewed by a seismologist

Reports from the public: 0 people

6.5 magnitude, 10 km depth
Western Indian Antarctic Ridge

Seismograph

Magnitude 6.1 earthquake hits east Taiwan

A major road in the centre of Taipei is seen damaged after an earthquake in Taipei, Taiwan
© REUTERS
A major road in the centre of Taipei is seen damaged after an earthquake in Taipei, Taiwan on April 18, 2019.
An earthquake of magnitude 6.1 struck Taiwan's coastal city of Hualien on Thursday (April 18), shaking buildings and temporarily suspending subway services in the capital Taipei, but there were no immediate reports of damage or casualties.

Local television footage showed school children being evacuated from buildings, while a weather bureau official said it was the largest quake to hit the island so far this year.

The quake struck at 1.01pm local time, and at a depth of 18km, the Central Weather Bureau said, adding that the quake measured at 4.0-magnitude in the Taipei area.

Seismograph

Tsunami warning lifted after strong 6.8 magnitude earthquake hits off Indonesia

The quake struck at a relatively shallow depth of
© USGS
The quake struck at a relatively shallow depth of 17km off the east coast of Sulawesi island.
A strong 6.8 magnitude earthquake rocked eastern Indonesia on Friday (April 12), the United States Geological Survey (USGS) said, triggering a tsunami warning and sending panicked residents fleeing from their homes.

The quake struck at a relatively shallow depth of 17km off the east coast of Sulawesi island, the USGS said, where a 7.5-magnitude quake-tsunami around the city of Palu killed more than 4,300 people last year.

Indonesia's disaster agency issued a tsunami warning for coastal communities in Morowali district, where residents were advised to move away from the coast.


Info

'Morphospace' governs recovery after mass extinction

Mass Extinction Event
© MARK GARLICK/SCIENCE PHOTO LIBRARY/Getty Images
The re-establishment of species diversity following an extinction event is consistently slower than evolutionary theory predicts.
Theory tells us that after a mass extinction, an event where the diversity of species is drastically reduced, nature should rebound with a flurry of creativity. Species should quickly proliferate to refill desolate ecosystems, something called adaptive radiation.

Yet, the paleontological record suggests that this doesn't happen at anywhere near the expected pace. Now, research published in the journal Nature Ecology and Evolution argues that understanding something called "morphospace" might help us find the cause.

Extinction events happen with alarming regularity: there's the "big five", but a host of slightly smaller, yet still devastating extinctions have peppered the planet's history.

Scientists now worry that we might be in the middle of one of our own making, so this makes it all the more important to understand how the natural world bounces back from such catastrophes.

Perhaps the most well-known of the earth's mass extinctions is the Cretaceous-Paleogene (K-Pg) extinction event. This took place 66 million years ago when an asteroid smacked into the earth next to what is now the Yucatán Peninsula, creating the nearly 200-kilometre-wide depression known as the Chicxulub crater. This impact drove the extinction of all the non-avian dinosaurs, and much else besides.

Seismograph

Shallow earthquake of magnitude 6.1 strikes east of Japan's Honshu

map quake
© USGS
An earthquake of magnitude 6.1 struck east of Japan's island of Honshu on Thursday, the United States Geological Service said.

There were no immediate reports of damage or casualties from the quake, which struck 174 km (108 miles) east of the city of Hachinohe, at a depth of 27 km (17 miles), the USGS added.

Bizarro Earth

California's 'earthquake pause' is unprecedented

San Andreas Fault
© Shutterstock
The San Andreas Fault runs through the Carrizo Plain in California.
It's a little too quiet in California, seismically speaking.

The state is experiencing a century-long lull in large, ground-rupturing earthquakes, temblors that actually offset the earth at the surface. The 7.9-magnitude Great San Francisco Earthquake of 1906 was a ground-rupturing quake; photographs taken in its aftermath show roads and fences with new bends and twists.

Now, new research finds that this 100-year earthquake gap is very unlikely to be a statistical fluke. Instead, something geological is probably causing the peaceful period.

"We're unusually quiet," said study co-author Glenn Biasi, a geophysicist at the U.S. Geological Survey (USGS) in Pasadena, California. "The biggest faults and the faults carrying most of the slip have not ponied up."