Welcome to Sott.net
Sat, 25 Sep 2021
The World for People who Think

Earthquakes

Bizarro Earth

Major Atlantic ocean current system might be approaching critical threshold

The major Atlantic ocean current, to which also the Gulf stream belongs, may have been losing stability in the course of the last century. This is shown in a new study published in Nature Climate Change. The Atlantic Meridional Overturning Circulation, or AMOC, transports warm water masses from the tropics northward at the ocean surface and cold water southward at the ocean bottom, which is most relevant for the relatively mild temperatures in Europe. Further, it influences weather systems worldwide. A potential collapse of this ocean current system could therefore have severe consequences.
Atlantic Meridional Overturning Circulation,
© R.Curry, Woods Hole Oceanographic Institution/Science/USGCRP
"The Atlantic Meridional Overturning really is one of our planet's key circulation systems," says the author of the study, Niklas Boers from the Potsdam Institute for Climate Impact Research, Freie Universität Berlin and Exeter University. "We already know from some computer simulations and from data from Earth's past, so-called paleoclimate proxy records, that the AMOC can exhibit - in addition to the currently attained strong mode - an alternative, substantially weaker mode of operation. This bi-stability implies that abrupt transitions between the two circulation modes are in principle possible."

Seismograph

Magnitude 6.1 earthquake strikes near Nicobar Islands, India - EMSC

quake
An earthquake of magnitude 6.1 struck about 310 km (190 miles)south southeast of Port Blair, India, the European-Mediterranean Seismological Centre (EMSC) said on Tuesday.

The quake was at a depth of 40 km, EMSC said.

Reporting by Maria Ponnezhath in Bengaluru; Editing by Kim Coghill

Seismograph

Earthquake rattles Greek islands close to Turkey

Nisyros

The Greek island of Nisyros
The Athens-based Institute of Geodynamics says a 5.4-magnitude tremor occurred early Sunday in the Aegean Sea, near the small Greek island of Nisyros, west of Rhodes

A 5.4-magnitude tremor occurred early Sunday in the Aegean Sea, near the small Greek island of Nisyros, west of Rhodes, the Athens-based Institute of Geodynamics reported.

The quake's epicenter was 23 kilometers (14.3 miles) south southwest of Nisyros, a small island, round in shape with about 1,000 inhabitants and an active volcano. The tremor occurred at 7:31 a.m. local time (0431 GMT) at a depth 15.6 kilometers (9.7 miles), the institute reported.

The quake was also felt in the Turkish coastal town of Datca in Mugla province. Turkey's emergency and disaster authority AFAD gave the magnitude as 5.5. Turkish authorities have not reported any damage.

Earlier, late Saturday and early Sunday, there had been two tremors of magnitudes 4.7 and 4.1, respectively.

Since then, several aftershocks have occurred. There are no reports of injuries or damage.

Seismograph

Shallow earthquake of magnitude 6.1 strikes Peru-Ecuador border region

quake
An earthquake of magnitude 6.1 struck the Peru-Ecuador border region on Friday, the GFZ German Research Center for Geosciences (GFZ) said.

The quake was at a depth of 10 km (6.21 miles), GFZ said.

Seismograph

Powerful 8.2 magnitude earthquake hits off Alaska - Strongest to hit state in 56 years

Alaska earthquake map
© Volcano Discovery
A powerful 8.2 magnitude earthquake has struck off the coast of Alaska, triggering a tsunami warning.

The shallow quake hit 56 miles (91 kilometers) southeast of the town of Perryville, the United States Geological Survey (USGS) said, with a tsunami warning in effect for south Alaska and the Alaskan peninsula.

The US government issued a tsunami warning for Alaska's southeast, while authorities in Hawaii also issued a tsunami watch.

'Hazardous tsunami waves for this earthquake are possible within the next three hours along some coasts,' the US Tsunami Warning System said in a statement.

Perryville is a small village about 500 miles from Anchorage, Alaska's biggest city.

An emergency alert sent to people's phones read: 'The National Weather Service has issued a TSUNAMI WARNING.

'A series of powerful waves and strong currents may impact coasts near you. You are in danger. Get away from coastal waters. Move to high ground or inland now. Keep away from the coast until local officials say it is safe to return.'


Comment: No tsunami but it was the strongest felt in the state since the 1964 event described above.

And this may herald the arrival of a cluster of strong quakes elsewhere.


Seismograph

Shallow 6.2-magnitude earthquake strikes off Indonesia's Sulawesi island

graph
An earthquake of 6.2-magnitude on Richter Scale struck near Indonesia's Sulawesi island on Monday, the United States Geological Survey said. The earthquake hit offshore Sulawasi island at around 5.39 PM but there is no tsunami warning as of now, news agency AFP reported.

There were no immediate reports of damage or loss of life. The epicenter of the quake was at a depth of 10 kilometres and at 97 km west-northwest of Luwuk, according to USGS. Tremors from the strong earthquake were also felt about 200 kilometres from the epicentre at Palu.

Indonesia falls under the 'Ring of Fire' arc on the Pacific ocean that has an intense seismic activity throughout the year. Also Read - Powerful Magnitude 6.8 Earthquake Jolts Panama and Costa Rica

In 2018, a 7.5-magnitude earthquake, followed by tsunami in Palu had left more than 4,300 people dead or missing.

Seismograph

Shallow 6.1-magnitude earthquake hits Kermadec Islands region: USGS

quake
An earthquake with a magnitude of 6.1 jolted Kermadec Islands region on Saturday, the U.S. Geological Survey said.

The epicenter, with a depth of 11.13 km, was initially determined to be at 29.9492 degrees south latitude and 176.902 degrees west longitude.

Seismograph

Magnitude 6.7 earthquake hits south of the Philippine capital

quake
An earthquake of magnitude 6.7 struck south of the Philippine capital early on Saturday, the Philippine Institute of Volcanology and Seismology said.

The agency said aftershocks were expected from the tectonic earthquake, which had a depth of 116 kilometres (72.08 miles).

Some residents in the capital region were awakened by the quake that lasted nearly a minute.

"The quake was deep so there is no tsunami," Renato Solidum, director of the Seismology agency, told DZRH radio station. "In Manila, the intensity 4.0 or 5.0 is strong but not yet destructive."

Seismograph

Shallow 6.9 magnitude earthquake hits offshore near Panama

Panama earthquake
© EMSC
A strong earthquake struck off the southern coast of Panama on Wednesday near the border with Costa Rica, although there were no immediate reports of damage and authorities said a tsunami was not expected.

The European-Mediterranean Seismological Centre (EMSC) said the earthquake had a 6.9 magnitude and hit at a depth of 2 km (1.2 miles) about 321 km (200 miles) southeast of Costa Rica's capital, San Jose. The U.S. Geological Survey measured the quake at a 6.8 magnitude.

Quakes of that magnitude can cause severe damage.

"Regarding the earthquake we felt in almost the entire country, we report that we have no damage to public infrastructure or personal injuries," said Alexander Solis, head of Costa Rica's National Emergency Commission.

A Reuters witness said the quake was felt in San Jose.

Seismograph

Strong shallow mag. 6.1 earthquake in the Bismarck Sea

quake
Local time at epicenter: 22 Jul 12:26 am (GMT +10)

Magnitude: 6.1

Depth: 10.0 km

Epicenter latitude / longitude: 3.39°S / 146.81°E (Bismarck Sea, Papua New Guinea)

Nearest volcano: Baluan (105 km / 65 mi)