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Mon, 26 Oct 2020
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Earthquakes


Seismograph

Dumfries, Scotland hit by shallow earthquake as locals describe 'rumbling and shaking'

Dumfries was hit by the quake
© Dumfries and Galloway Standard
Dumfries was hit by the quake
Parts of Scotland were hit by an earthquake yesterday.

The 2.0-magnitude earthquake was felt in parts of the borders of the country.

The British Geological Survey (BGS) said people reported a 'low rumbling' in Dumfries at around 1pm.

A statement describing the quake from the group read: "Felt by a few people in Dumfries, Kirkpatrick Durham and Thornhill. Reports described, "a low rumbling" and "weak shaking"."

Initial data from the BGS suggested the quake's depth was six miles and its epicentre was around five miles west of the town.

Comment: Recently Perthshire, Scotland was struck by its ninth earthquake in just over a month.


Seismograph

6.1-magnitude earthquake hits off Tonga

Earthquake
© Associated Press
An earthquake with a magnitude of 6.1 jolted 85 km NE of Hihifo, Tonga at 11:47:37 GMT on Sunday, the U.S. Geological Survey said.

The epicenter, with a depth of 44.4 km, was initially determined to be at 15.317 degrees south latitude and 173.348 degrees west longitude.

Info

'Lost' tectonic plate discovered under the Pacific

Mantle tomography image
© University of Houston
A 3D block diagram across North America showing a mantle tomography image reveals the Slab Unfolding method used to flatten the Farallon tectonic plate. By doing this, Fuston and Wu were able to locate the lost Resurrection plate.
Scientists have reconstructed a long-lost tectonic plate that may have given rise to an arc of volcanoes in the Pacific Ocean 60 million years ago.

The plate, dubbed Resurrection, has long been controversial among geophysicists, as some believe it never existed. But the new reconstruction puts the edge of the rocky plate along a line of known ancient volcanoes, suggesting that it was once part of the crust (Earth's top layer) in what is today northern Canada.

"Volcanoes form at plate boundaries, and the more plates you have, the more volcanoes you have," Jonny Wu, a geologist at the University of Houston, said in a statement. "Volcanoes also affect climate change. So, when you are trying to model the Earth and understand how climate has changed ... you really want to know how many volcanoes there have been on Earth."

Wu and his co-author, University of Houston geology doctoral candidate Spencer Fuston, used a computer model of Earth's crust to "unfold" the movement of tectonic plates since the early Cenozoic, the geological era that began 66 million years ago. Geophysicists already knew that there were two plates in the Pacific at that time, the Kula plate and the Farallon plate.

Seismograph

6.1-magnitude earthquake hits south of the Fiji Islands

Earthquake
© Associated Press
An earthquake with a magnitude of 6.1 jolted south of the Fiji Islands at 07:04:32 GMT on Friday, the U.S. Geological Survey said.

The epicenter, with a depth of 463.9 km, was initially determined to be at 25.6127 degrees south latitude and 179.9645 degrees west longitude.

Comment: About 5 hours earlier and also in the Pacific Ocean: Shallow 6.0-magnitude earthquake hits West Chile Rise


Seismograph

Shallow 6.0-magnitude earthquake hits West Chile Rise

earthquake graph
© Phil McCarten / Reuters
An earthquake with a magnitude of 6.0 jolted West Chile Rise at 0146 GMT on Friday, the U.S. Geological Survey said.

The epicenter, with a depth of 10.0 km, was initially determined to be at 36.4011 degrees south latitude and 97.1352 degrees west longitude.

Seismograph

Iceland's capital Reykjavik is rattled by powerful 5.6-magnitude earthquake

The Krysuvik geothermal area near Reykjavik

The Icelandic Meteorological Office said the quake struck at 1.43pm today and was centred near Krysuvik, about 20 miles south of the capital (Pictured: The Krysuvik geothermal area near Reykjavik)
Iceland's capital Reykjavik has been rattled by a 5.6-magnitude earthquake a week after rumblings were detected at the volcano which grounded 900 flights in 2011.

The Icelandic Meteorological Office said the quake struck at 1.43pm on Tuesday and was centred near Krysuvik, about 20 miles south of the capital. There were no immediate reports of injuries.

Prime Minister Katrin Jakobsdottir was being interviewed on live television from her home when everything around her started shaking.

'Oh my God there's an earthquake,' she said as she grabbed hold of the desk in front of her and gasped.

'Well this is Iceland!' The 44-year-old PM said as she laughed off the bang, saying she was 'perfectly fine' and 'the house was still strong.'

Meanwhile, the parliament in Reykjavik was also rocked by the seismic movements, sending an MP addressing the house rushing for cover.


Seismograph

Powerful magnitude 7.5 earthquake strikes Alaska, tsunami warning issued

Earthquake
© Associated Press
A 7.5-magnitude earthquake struck Alaska Monday local time, prompting a tsunami warning to go into effect.

According to the US Geological Survey (USGS), the quake occurred 94 kilometers southeast of Sand Point, Alaska, and was initially recorded as a magnitude 7.4 quake.


No injuries or structural damages have been reported so far.

Seismograph

Perthshire, Scotland struck by ninth earthquake in just over a month

Blackford, where many of the earthquakes took place

Blackford, where many of the earthquakes took place
Perthshire continues to be rumbled by a series of seismic activity after two minor earthquakes hit the area within five minutes of each other at the weekend.

Saturday's incidents now make it nine tremor events in the area since the start of September.

The first on Saturday took place at 7.23am, with the epicentre near Gleneagles, measuring a 1.5 magnitude at a depth of five kilometres.

Five minutes later a 1.8 magnitude quake was registered a few miles away at a depth of seven kilometres.

Both tremors were felt by residents in Blackford, but there have been no reports of any damage so far, and were recorded at the nearby British Geological Society (BGS).

Blackford experienced the sixth and seventh tremors in the series on the Sunday prior - the former of which being the biggest recorded in over a decade.

A 2.5 magnitude and smaller 0.8 magnitude quake hit the village in the evening with aftershocks reported in Auchterarder and Aberuthven.

Comment: Last month further south in the UK an English town was hit by a fourth earthquake in two weeks.


Attention

Landslide induced mega-tsunami 'could happen at anytime' at Alaska's Barry Glacier

barry glacier

Barry glacier June 2019
While kayaking in Barry Arm fjord in June 2019, Valisa Higman, an artist-in-residence at Alaska's Chugach National Forest, noticed some odd fractures on a cliff overlooking the fjord. Curious if the slope might be in the process of collapsing, she emailed photos (see one of them below) to her brother, Bretwood Higman. "Hig" is a geologist with Ground Truth Alaska, and he has studied landslides and tsunami deposits for decades.

He was soon inspecting the area using Google Maps, zooming in to the maximum extent possible and searching for signs of slippage. He saw the cracks as well, but nothing about them struck him as strong evidence of a big landslide. "But it turns out I had made a geology 101 error," he said. "I hadn't zoomed out enough, and I missed the big picture." Still, he kept Barry Arm on a list of possible landslides to investigate more someday.

A few months later, Chunli Dai offered that chance. The Ohio State researcher was working on a NASA-funded project to develop new ways to automatically detect landslides in the Arctic, and she was looking for test sites to check how well the tool was working. Her project makes use of a high-resolution dataset called ArcticDEM and machine learning to automatically search for and flag landslides.

Comment: From giant fissures, gaping sinkholes, and epic landslides to methane deposit explosions, earth movements of all kinds appear to be on the increase: For insight into what may be driving this shift, SOTT radio reports:


Seismograph

Shallow M6.0 earthquake hits Easter Island Region, Chile

Easter Islands region quake
© Volcano Discovery
Date & time: Saturday, 10 October 2020 13:14 UTC
Local time at epicenter: 10 Oct 6:14 am (GMT -7)
Magnitude: 6.0
Depth: 10.0 km
Epicenter latitude / longitude: 28.67°S / 112.3°W (Chile)