Welcome to Sott.net
Thu, 26 Nov 2020
The World for People who Think

Earthquakes


Seismograph

6.1 magnitude earthquake jolts Balleny Islands region, Southern Ocean

earthquake graph
© Phil McCarten / Reuters
An earthquake with a magnitude of 6.1 jolted Balleny Islands region in the Antarctic Ocean at 2256 GMT on Wednesday, the U.S. Geological Survey said.

The epicenter, with a depth of 10.0 km, was initially determined to be at 61.9292 degrees south latitude and 154.8222 degrees east longitude.

The Balleny Islands are a series of uninhabited islands heavily glaciated and of volcanic origin.

Seismograph

6.2 magnitude earthquake hits off Chile coast - USGS

chile quake map
© USGS
A 6.2-magnitude earthquake rocked the Chilean coast, the US Geological Survey has reported. It struck at a depth of 20 kilometers (12 miles).

The jolt occurred late Saturday 157.4 km (97.8 miles) to the southeast of Talca, a city of around 200,000 people south of the capital, Santiago.

There has been no tsunami alert issued as a result of the quake.

Around 10 million people might have felt the quake, according to the European-Mediterranean Seismological Centre.

However, it is not expected to cause casualties or major material damage.

Seismograph

Russian Antarctic station rattled by shallow M6.0 earthquake

Russian Bellingshausen station
© Lotus Communications/TASS
Russian Bellingshausen station
The Russian polar station Bellingshausen in the Antarctic is registering tremors with a magnitude of up to 6.0, the Arctic and Antarctic Research Institute, the country's sole operator of Antarctic research, reported on Thursday.

"At the Bellingshausen station... tremors with a magnitude of 4.7 - 6.0, with their epicenter located at a distance of 40-50 km southeast of the station in the Bransfield Strait at depths in the earth's crust from 1.5 to 10 km," the Institute's press office said in a statement.

The Russian polar stations in the Antarctic are now carrying out preparatory work under the program of the 66th Russian Antarctic expedition. In particular, the Vostok station has completed the work to prepare the runway 3,700 meters long. The Progress and Mirny stations have also finished the work to put runways into operation. The Novolazarevskaya station is carrying out emergency work to clean and restore the runway after a recent blizzard. The first flight of an Il-76 plane from Cape Town is scheduled for November 19.

Seismograph

Magnitude 6.3 earthquake jolts Indonesia

earthquake reading
A 6.3-magnitude earthquake rattled Indonesia's West Sumatra province Tuesday, according to the country's Meteorological, Climatological and Geophysical Agency (BMKG).

The agency said the earthquake's epicenter was 109 kilometers (67 miles) southwest of the town of Tuapejat in the Mentawai Islands off the province's coast.

The natural disaster occurred 10 kilometers (6.2 miles) below the surface.

Although no initial deaths were reported, a tsunami alert was issued.

*Writing by Ali Murat

Info

East African Rift system is slowly breaking away

East African Rift System.
© Figure created by D.S. Stamps.
Final model for the East African Rift System. Hashed lines indicate newly discovered broad deforming zone. Arrows represent predicted tectonic plate motions. ABFZ—Andrew Bain Fracture Zone; IFZ—Indomed Fracture Zone; RSZ—Ranotsara shear zone.
The African continent is slowly separating into several large and small tectonic blocks along the diverging East African Rift System, continuing to Madagascar - the long island just off the coast of Southeast Africa - that itself will also break apart into smaller islands.

These developments will redefine Africa and the Indian Ocean. The finding comes in a new study by D. Sarah Stamps of the Department of Geosciences for the journal Geology. The breakup is a continuation of the shattering of the supercontinent Pangea some 200 million years ago.

Rest assured, though, this isn't happening anytime soon.

"The rate of present-day break-up is millimeters per year, so it will be millions of years before new oceans start to form," said Stamps, an assistant professor in the Virginia Tech College of Science. "The rate of extension is fastest in the north, so we'll see new oceans forming there first."

Seismograph

Magnitude 6.1 earthquake hits Mindanao, Philippines

Philippines quake map
© USGS
The offshore quake hit at a depth of 33km south-east of the town of San Agustin, Surigao Del Sur.
An earthquake of magnitude 6.1 struck Mindanao in the Philippines, the European Mediterranean Seismological Centre (EMSC) said on Monday (Nov 16).

The quake was at a depth of 15km, it added.

The earthquake, which is tectonic in origin, will trigger aftershocks, the Philippine Institute of Seismology and Volcanology (Phivolcs) said. Damage is expected.

Seismograph

Three M5+ earthquakes struck yesterday...within three minutes of each other

Three M5+ earthquakes
© Twitter/TheBlazinAce (screen capture)
Three M5+ earthquakes struck yesterday, Friday 13th November, within a few minutes of each other.

Seismograph

6.0 magnitude earthquake hits 289 km from Tonga

Earthquake
© Associated Press
An earthquake with a magnitude of 6.0 jolted 289 km WNW of Haveluloto, Tonga at 00:48:43 GMT on Wednesday, the U.S. Geological Survey said.

The epicenter, with a depth of 416.93 km, was initially determined to be at 19.7409 degrees south latitude and 177.5517 degrees west longitude.

Seismograph

Shallow M5.5 earthquake hits North Macedonia

Macedonia quake map
The German Research Centre for Geosciences (GFZ) reported a magnitude 5.5 quake in Macedonia near the town of Vrutok only 3 minutes ago. The earthquake hit early morning on Wednesday 11 November 2020 at 4.54 am local time at a shallow depth of 10 km. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.

Based on the preliminary seismic data, the quake should have been felt by everybody in the area of the epicenter. In those areas, dangerous ground shaking occurred with the potential to inflict moderate to heavy damage to buildings and other infrastructure. Towns or cities where the quake likely caused strong ground shaking include:

Info

2019 Ridgecrest earthquake reveals unusual surface movement

2019 Ridgecrest earthquake
© Scripps Institution of Oceanography
Location of the 2019 Ridgecrest earthquake, in the San Andreas Fault area of California.
SOEST Earth Sciences professor Bridget Smith-Konter and graduate student Lauren Ward co-authored a study published recently in Science that revealed unusual surface deformation associated with the 2019 Ridgecrest earthquake in the San Andreas Fault area of California.

Watch the video below.

The research team, led by scientists at the Scripps Institution of Oceanography, analyzed satellite data and discovered hundreds of previously unmapped fractures surrounding the 2019 Ridgecrest earthquake sequence.

Most deformation associated with an earthquake is, not surprisingly, in the same direction as the fault rupture. However, the researchers found areas of deformation associated with the 2019 event that moved in the opposite direction.