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Tue, 16 Jul 2019
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Earthquakes

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."

Attention

Earthquake swarm and huge "slow-slip" event at New Zealand's North Island

New Zealand 7.8 earthquake map
© Google Earth/ GNS Science
The 2016 Kaikoura earthquake was a magnitude 7.8 (Mw) earthquake in the South Island of New Zealand that occurred two minutes after midnight on 14 November 2016 NZDT (11:02 on 13 November UTC).
A swarm of earthquakes has been triggered off the North Island's east coast by a large seismic event similar to what preceded the 2011 Japanese quake and tsunami. GNS Science has confirmed one of the largest "slow-slips" ever observed in New Zealand is currently underway off the coast of Gisborne in the Hikurangi subduction zone.

This slow-slip began last week and so far scientists have recorded "up to 3cm of eastward displacement," said Wallace.

"This is caused by up to 10-15cm of movement on the Hikurangi plate boundary offshore of Gisborne."

While these events are fairly common, happening every one or two years, this slow-slip is on track to be "as large at the previous slow-slip" recorded off Gisborne in 2010.

Since Monday, 85 quakes have been recorded in the area.

Comment: Activity around the ring of fire has seen an uptick recently: A total of 12 major quakes, (Mag 6 or higher) occurred in March with all 12 recorded around the Pacific ring of fire

Also check out SOTT's monthly documentary: Earth Changes Summary - March 2019: Extreme Weather, Planetary Upheaval, Meteor Fireballs




Seismograph

Strong 6.3-magnitude earthquake strikes Dili, East Timor

chart
The U.S. Geological Survey declared that an earthquake of a 6.3-magnitude has rattled 197 km NNW of Dili, East Timor at 21:55:01 GMT on Saturday.

The epicenter was initially located at 6.8491 degrees south latitude and 125.0425 degrees east longitude.

Meanwhile, the tremor hit 538.48 km deep into the ground.

Seismograph

6.6-magnitude quake hits off South Georgia and the South Sandwich Islands

chart
A 6.6-magnitude earthquake jolted 137km NNW of Visokoi Island, South Georgia and the South Sandwich Islands at 16:14:20 GMT on Friday, the U.S. Geological Survey said.

The epicenter, with a depth of 61.0 km, was initially determined to be at 55.5 degrees south latitude and 27.7 degrees west longitude.

Source: Xinhua

Seismograph

A total of 12 major quakes, (Mag 6 or higher) occurred in March with all 12 recorded around the Pacific ring of fire

USGS
© USGS
March delivered 12 major quakes, (Mag 6 or higher) with the biggest being a Mag 7.0 - 25km NNE of Azangaro, Peru on the first day of March.

All 12 major quakes in March were recorded around the Pacific ring of fire, see map above.

So far, 2019 has recorded 33 major quakes with the biggest being a Mag 7.5 - 117km ESE of Palora, Ecuador in February, see the video below.

30 of the 33 major quakes recorded this year happened along the Pacific ring of fire.


Seismograph

Shallow magnitude 6.5 earthquake hits off Aleutian Islands, Alaska

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A 6.5-magnitude earthquake was registered off the coast of Kiska in the Aleutian Islands near Alaska on Tuesday, the US Geological Survey (USGS) reported.

The quake was registered at 21:35 GMT. The epicentre of the earthquake was located 31 kilometres (19 miles) to the northeast of the island at a depth of 19.1 kilometres (12 miles). No casualties or damages have been reported.

The Aleutian Islands with their 57 volcanoes form the northernmost part of the Pacific Ring of Fire, where a large number of earthquakes and volcanic eruptions occur.