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Tue, 29 Sep 2020
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Earthquakes


Seismograph

Shallow 6.2-magnitude earthquake hits south of Africa, USGS says

graph
A 6.2-magnitude earthquake hit south of Africa at around 17:10 GMT this Saturday with the epicentre lying at the depths of 10 kilometres, according to the US Geological Survey

No tsunami warning has been issued yet. Meanwhile, people living in South Africa have been reporting tremors.


Seismograph

UK town hit by fourth earthquake in two weeks

Tremors were felt in Leighton Buzzard for the third time in three weeks
© Richard Croft
Tremors were felt in Leighton Buzzard for the fourth time in two weeks
Leighton Buzzard has been hit by two aftershocks in the space of a few hours - taking the total number of earthquakes felt in the area over the last two weeks to four.

A magnitude 2.1 event struck at 1.39pm on Tuesday afternoon, just over four hours after a 3.0 tremor was felt in the Bedfordshire town at 9.32am.

Geologists said they were likely to be aftershocks of the first quake felt in the area on 8 September.

"There's obviously been some stress been building up in that particular area and we've had the initial earthquake," said Glenn Ford, a seismologist with the British Geological Survey (BGS). "It's maybe just still rebalancing the stress regime in that particular part of the world and we're getting these little aftershocks occurring as well."

The 8 September tremor was magnitude 3.5 and the first aftershock five days later measured 2.1.

According to the BGS, residents said Tuesday's first tremor "only lasted a couple of seconds" and that they "felt a single jolt, a bit like being in a car that has done an emergency stop".

Comment: SECOND earthquake in a week hits UK town


Seismograph

Southern California is rocked by a 4.5-magnitude earthquake - with tremors felt from Los Angeles to San Diego

California quake map
© USGS
A 4.5-magnitude earthquake rocked Southern California, with tremors felt from Los Angeles down to San Diego.

The quake hit 10 miles west of L.A. at 11.39 pm local time on Friday, according to the US Geological Survey.

It occurred at a depth of nearly 11 miles, and lasted for 30 seconds. It was reported to be one of the biggest earthquakes to hit the L.A. area in years.

There have been no reports of injuries or damage to property, but authorities warned locals to prepare for aftershocks.

The Los Angeles Fire Department posted a tweet shortly after the quake, which read: 'If Inside When Shaking Starts: DROP, COVER, HOLD ON! Protect Your Head & Neck While Taking Cover Under Sturdy Furniture or Near a Sturdy Interior Wall, Away From Windows and Doorways Until Shaking Stops.

Seismograph

6.9 magnitude earthquake hits Mid-Atlantic ridge

Mid Atlantic ridge quake
A magnitude 6.9 earthquake occurred Friday evening on the central Mid-Atlantic Ridge between the west Coast of Africa and South America at 6:43 PM EDT.

The epicenter is over 4,000 miles away from the state of Florida and poses no tsunami threat to the U.S. mainland.

Seismograph

Shallow M6.1 earthquake strikes Fiji Islands Region

Fiji quake map
© emsc-csem
An earthquake with a magnitude of 6.1 jolted 149 km NNE of Labasa, Fiji at 04:12:17 GMT on Tuesday, the U.S. Geological Survey said.

The epicenter, with a depth of 10.0 km, was initially determined to be at 15.145 degrees south latitude and 179.7934 degrees east longitude.

Seismograph

Deep 6.4 magnitude earthquake hits Russia's Kamchatka peninsula

Russia quake map
© Volcano Discovery
The large quake hit Russia's Kamchatka peninsula region on the country's far-east coast, over 6,200 km from Moscow. Specifically, the earthquake struck just 22km West North-West of Esso, Russia, which has a population of around 1,900, according to the European Mediterranean Seismological Centre.

The EMSC said the quake hit at a depth of 320km - nearly 200 miles - at around 03:41 UTC, or 04:41 UK time.

There are no reports of damage or injuries at the time of writing.

However, there have been at least 14 reports of people feeling the quake, according to EMSC.

Accounts vary widely, with some reporting stronger feelings of shaking than others, with the duration of the quake also reported differently amongst people.

Seismograph

SECOND earthquake in a week hits UK town

Leighton Buzzard quake map
© EMSC
The latest Leighton Buzzard quake is thought to have been an aftershock from the magnitude 3.5 quake that was felt on September 8
A second earthquake in the space of a week has hit Leighton Buzzard, according to the British Geological Survey (BGS).

The tremor in Bedfordshire, which hit at 11.20pm on Sunday night, was measured by the BGS at magnitude 2.1.

It is thought to have been an aftershock from the magnitude 3.5 quake that was felt on September 8.

A BGS spokesman said: 'The most recent event was over 100 times smaller than the event on September 8 in the same area.

'The occurrence of smaller events from other previous UK earthquakes is not unknown.

'The small event that occurred in Bedfordshire last night could have occurred because all the stress in the rocks was not relieved by the event on September 8 in the same area or it caused a slight change to the stress regime in that location.

'There is constant ongoing research in the academic world on the issue of aftershock occurrence.'

Comment: 'Quite large' M3.3 earthquake felt across several towns in southern England


Seismograph

Shallow M6.1 earthquake jolts Japan's Miyagi Prefecture

The epicenter of the earthquake that occurred on Sept. 12 at 11:44 a.m. is located in Miyagi Prefecture
© JAPAN METEOROLOGICAL AGENCY
The epicenter of the earthquake that occurred on Sept. 12 at 11:44 a.m. is located in Miyagi Prefecture
A magnitude 6.1 earthquake, which measured 4 on the shindo (intensity) scale, was detected at a depth of 40 kilometers off the coast of Miyagi Prefecture, on Saturday at 11:44 a.m.

There is currently no tsunami warning in effect.

As a precaution, those near coastal areas are advised to move to higher ground.

Seismograph

6.3 magnitude earthquake strikes Chile

earthquake graph
© Phil McCarten / Reuters
According to seismologists, the earthquake occurred at a depth of 44 kilometres.

A 6.5-magnitude earthquake has struck near the coast of Northern Chile. No tsunami alert has been issued.

No possible casualties or damage have been reported so far.

​Chile is situated in the easternmost part of the Ring of Fire, a seismically active zone in the Pacific Ocean, where many earthquakes and volcanic eruptions occur, including powerful ones.

Comment: Less than a week ago a M6.2 earthquake hit Chile. There has been an increase in seismic activity worldwide recently.


Seismograph

Over 90 earthquakes in 24 hours reported near Yellowstone Lake

Seismic activity near Yellowstone Lake has seen a big increase over the past 24 hours
© USGS
Seismic activity near Yellowstone Lake has seen a big increase over the past 24 hours.
The southwest side of Yellowstone Lake, the largest body of water in Yellowstone National Park, is experiencing quite an uptick in seismic activity today, Thursday, September 10.

According to the United States Geological Survey (USGS), Yellowstone experiences about 1,500 to 2,500 located earthquakes per year, many occurring in swarms, or earthquakes that cluster in time and space. Most swarms are small, containing 10-20 earthquakes, and short, lasting for one to two days.

Today's seismic activity is a little abnormal in that as of 4 pm Thursday, 93 earthquakes, and counting, have occurred all within this area of Yellowstone Lake since Wednesday night, according to USGS data. All but seven of the earthquakes have been under 2.5 magnitude. None have reached 3.0 magnitude.

In the same area depicted in the map below, 108 earthquakes have been recorded over the past 30 days, including today's activity. That means only 15 earthquakes were recorded in the area before today.