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Fri, 14 Aug 2020
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Earthquakes

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6.3-magnitude earthquake strikes off Indonesia's Bali, no tsunami alert issued

Graph
A 6.3-magnitude earthquake jolted Bali resort island earlier Thursday, but there was no potential for tsunami, the meteorology and geophysics agency said.

The quake struck at 01: 12 a.m. Jakarta time Thursday (1812 GMT Wednesday) with epicenter at 69 km northeast Bangkalan of East Java province and the depth at 636 km under sea bed, Jerisman Purba, an official in charge of the agency, said.

"The center of the quake is very deep. It did not potentially trigger tsunami, so we did not issue a warning for that," he told Xinhua by phone.

Seismograph

Strong quakes hammer Greece for second day

greece quake
© Google/USGS
Magnitude 5.8 earthquake
Affected countries: Turkey and Greece
63 km from Karpathos, Greece · Jan 30, 12:21
Earthquakes today have emerged around the Pacific Ring of Fire, where most of the world's seismic activity takes place. The United States Geological Survey (USGS) has recorded a total of 58 earthquakes, many of which touched down in clusters.

The world saw nearly 60 earthquakes today, most of which came in at middling magnitudes.

However, the USGS also recorded several potentially damaging higher magnitude tremors.

According to the organisation, today's biggest earthquake measured in at a magnitude of 5.8 and struck Greece earlier this morning.

The earthquake, one of six to strike the area from 1.30am today, rocked the Mediterranean sea to the east of Karpathos.

Comment: See also:


Seismograph

6.0 magnitude earthquake hits Solomon Islands

Soloman Islands earthquake
© Google, TW/SAM

An earthquake with a magnitude of 6.0 jolted 70 km west of Kirakira, Solomon Islands, at 13:49:50 GMT on Wednesday, the U.S. Geological Survey said.

The epicenter, with a depth of 86.63 km, was initially determined to be at 10.3749 degrees south latitude and 161.2802 degrees east longitude.

Comment: This is the second M6+ earthquake to hit the region since a M6.3 struck on January 27. The recent uptick in seismic activity continues!


Seismograph

Shallow magnitude 6.1 aftershock hits near Cayman Islands - USGS

M6.1 earthquake hits off the Cayman islands on January 28 2020
© USGS
M6.1 earthquake hits off the Cayman islands on January 28 2020.
A shallow 6.1-magnitude quake struck some 53 km off the coast of the Cayman islands at the depth of just 10 km. It came shortly after a powerful 7.7- quake off Jamaica triggered a tsunami warning across the Caribbean.

The Pacific Tsunami Warning Center (PTWC) said that it's unlikely the aftershock, which was reported at 21:55 GMT on Tuesday, would trigger any tsunami waves, but did not rule out the possibility outright in its initial statement.

"Based on all available data...there is no significant tsunami threat from this earthquake. However... there is very a small possibility of tsunami waves along coasts located near the epicenter," the PTWC said.

The initial magnitude of 6.5 reported by The US Geological Survey (USGS) was later downgraded to 6.1. The aftershock hit west of the first, 7.7-strong quake, that sent ripples across the region, prompting a tsunami alert for Mexico, Cuba, Jamaica, the Cayman Islands and several other countries. That tsunami warning was eventually lifted.

Comment: Jamaica earthquake: Huge shallow 7.7-magnitude tremor hits off island's coast - tsunami warning issued


Seismograph

Jamaica earthquake: Huge shallow 7.7-magnitude tremor hits off island's coast - tsunami warning issued

mao quake
A tsunami warning has been issued for parts of the Caribbean after a huge earthquake struck.

Jamaica, Cuba and the Cayman islands were all said to be at risk.

The US Geological Survey said the 7.7-magnitude quake hit off the northwest coast of Jamaica, prompting the US Tsunami Warning Center to issue an alert.

It was so big that schools in Jamaica and buildings in Miami - 580 miles away - were evacuated.


Attention

Possible magma accumulation on Reykjanes peninsula, Iceland

Possible Magma Accumulation on Reykjanes Peninsula
Authorities have declared a state of uncertainty due to possible magma accumulation on the Reykjanes peninsula in Southwest Iceland. The aviation colour code has been raised to yellow for the region, which includes Keflavík International Airport. An earthquake swarm has been ongoing in the area and inflation has been detected in the last few days.

A statement from the Icelandic Met Office asserts that, while earthquake swarms are not unusual in the area, "[t]he fact that an inflation is occurring alongside the earthquake swarm is a cause for closer concern and closer monitoring." The inflation is occurring just west of Þorbjörn mountain, near the town of Grindavík, and is unusually rapid, around 3-4 mm per day. It has accumulated to 2cm to date and is most likely a sign of magma accumulation at a depth of just a few kilometres. It is not certain that magma accumulation is causing the inflation, but if such is the case, then, according to the Met Office, "the accumulation is very small."

Seismograph

Strong magnitude 6.3 earthquake strikes Solomon Islands

Magnitude 6.3 earthquake strikes Solomon Islands
© AFP
A 6.3-magnitude earthquake hit the Solomon Islands on Monday, the US Geological Survey said, but no tsunami warning was issued.

The powerful quake struck just after 4 pm (0500 GMT) at a depth of 17.7 kilometres (11 miles) some 140 kilometres (90 miles) southeast of the Pacific nation's capital Honiara, the USGS added.

The Solomon Islands Met Service said there was no tsunami threat from the undersea quake.

Garedd Porowai, marketing team leader for Solomon Islands Tourism, said the tremor was "not the biggest" he had felt but it "gave us quite a jolt here in the office".

There was no visible evidence of damage in Honiara's central business district, he added.

Info

Behavior of slow earthquakes explained by new evidence

Earth from Space
© University of Ottawa
A team of researchers at the University of Ottawa has made an important breakthrough that will help better understand the origin and behavior of slow earthquakes, a new type of earthquake discovered by scientists nearly 20 years ago.

These earthquakes produce movement so slow - a single event can last for days, even months - that they are virtually imperceptible. Less fearsome and devastating than regular earthquakes, they do not trigger seismic waves or tsunamis. They occur in regions where a tectonic plate slides underneath another one, called ''subduction zone faults'', adjacent but deeper to where regular earthquakes occur. They also behave very differently than their regular counterparts. But how? And more importantly: why?

Pascal Audet, Associate Professor in the Department of Earth and Environmental Sciences at uOttawa, along with his seismology research group (Jeremy Gosselin, Clément Estève, Morgan McLellan, Stephen G. Mosher and former uOttawa postdoctoral student Andrew J. Schaeffer), were able to find answers to these questions.
"Our work presents unprecedented evidence that these slow earthquakes are related to dynamic fluid processes at the boundary between tectonic plates," said first author and uOttawa PhD student, Jeremy Gosselin. "These slow earthquakes are quite complex, and many theoretical models of slow earthquakes require the pressure of these fluids to fluctuate during an earthquake cycle."
Using a technique similar to ultrasound imagery and recordings of earthquakes, Audet and his team were able to map the structure of the Earth where these slow earthquakes occur. By analyzing the properties of the rocks where these earthquakes happened, they were able to reach their conclusions.

Seismograph

Shallow 5.6-magnitude quake hits off Amatignak Island, Alaska - USGS

Earthquake seismograph
A 5.6-magnitude earthquake jolted 65 km SW of Amatignak Island, Alaska at 0631 GMT on Sunday, the U.S. Geological Survey said.

The epicenter, with a depth of 1.0 km, was initially determined to be at 50.924 degrees north latitude and 179.875 degrees west longitude.

Comment: A few days ago a shallow magnitude 6.2 earthquake struck near Adak, Alaska.


Seismograph

NEW 5.1 earthquake hits already quake-devastated E. Turkish province

Earthquake
© Reuters / Ismail Coskun
Rescuers work on collapsed buildings after an earthquake in Elazig, Turkey, January 25, 2020.
A 5.1 magnitude quake has struck Turkey's Elazig province, one day after a 6.8 tremor leveled buildings and killed at least 22 people.

The earthquake struck at around 7:30pm local time on Saturday, at a depth of 10km, the United States Geological Survey (USGC) reported. The European-Mediterranean Seismological Centre (EMSC) has put the magnitude at 4.9.

Comment: See also: Major 6.8M earthquake strikes eastern Turkey - At least 20 dead, felt as far south as Tel Aviv

Ruptly has released drone footage of the aftermath of the earthquake in the town of Gezin:


Another video shows rescue workers searching for survivors and clearing out the rubble of a collapsed building in the same town situated dozens of miles away from the most-affected Elazig: