Earthquakes around the world

Today around 13:08 another earthquake hit in Croatia, Magnitude 4, EMSC says 4,2.
Lasted around 5s, MSM says it felt in Slovenia as well...
 
February 13, 2021, 6:33 pm, 3.8 mag. earthquake in Banff, Alberta Canada. We don't hear about a lot of earthquakes coming out of the Rockies, so when one does it's pretty big news. Apparently they are not uncommon but they're so small you don't even notice them. For almost 3 years, I used to live in Jasper, Alberta, a town 289 km north of Banff. I never felt one and I don't remember anyone living there ever mentioning one. This earthquake was a bit bigger with the epicentre just about 6 km north of the town at a depth of around 17.3 km. It looks like it was directly under a mountain named the Cascade Mountain. A large boom was heard after the rumbling started. No reported damages or injuries.
Here is another news/video piece about it.


The below describes the earthquake as initiating at a "Hypocenter depth recalculated from 0.0 to 5.0 km (from 0 to 3.1 mi)."

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Weak shaking might have been felt in Banff (pop. 7,500) located 3 miles from the epicenter, and Canmore (pop. 12,300) 13 miles away.
Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Cochrane (pop. 16,400) located 47 miles from the epicenter, Calgary (pop. 1,019,900) 65 miles away, and Airdrie (pop. 24,700) 66 miles away.

This link looks to the seismic zones of wester Canada; in this case it is the southern Cordillera.

 
Last saw quite an uptick worldwide of bigger quakes. There were 2 M7 (M7.7 in Loyalty Islands and a M7.1 in Japan) and 8 M6.
In the usual map area, it was quiet with just 1 out of 182 earthquakes worldwide equal to or greater than 4.5 and 1792 out of 2313 quakes of all sizes.
Percentage: 77.5%
The last week was more quiet. There was 1 M6.2 in Vanuatu and 3 M6.1 in the same geographical region.
As for the usual area, there were 2 earthquakes out of 123 worldwide equal to or greater than 4.5 and 1423 out of 1875 quakes of all sizes worldwide.
Percentage: 75.9%
Earthquakes 7 days to Feb 21st  2021.gif
 
From the Independent:

Iceland earthquake: 5.6-magnitude tremor strikes near Reykjavik


Parts of Iceland were rocked by a 5.6-magnitude earthquake on Wednesday as residents reported shaking buildings and strong tremors.

The quake's epicentre was recorded about 25 miles away from Reykjavik, in the Reykjanes Peninsula region, on Iceland's southeast coast.

The effects of the quake, which struck at a depth of around six miles, were felt in Reykjavik and the surrounding areas.

It was not immediately clear if there had been any damage to property or injury to life.

"Spent the morning shaking around the office, geologists all running around like excited puppies. So much shaking," Rob Askew, a geologist at the Icelandic Institute of Natural Science in Reykjavík, tweeted.

Another Twitter user wrote: "WOW....! Just now! #earthquake swarm on Reykjanes Peninsula #Iceland - very strongly felt in Reykjavík. My home office was shaking! Felt 2 large ones and many small ones."

Another said: "I've experienced more earthquakes in the past couple of hours than the rest of my life combined. And I've spent most of my life in Iceland and Japan. Something's up. I don't like it."

The 5.6-magnitude quake came amid a flurry of geological activity along the Mid-Atlantic Ridge, where the Earth's North American and Eurasian tectonic plates meet.

Friction between the two plates can sometimes result in earthquakes and tremors.

Last year, Iceland was hit by around 3,000 earthquake tremors in the space of a few days.

The tremors were caused by three separate earthquakes - each one with a magnitude of more than five - that struck the northern coast over the weekend of 19 June, according to Iceland's meteorological service.

Officials had warned at the time that the Grimsvotn volcano, Iceland's most active, was at risk of erupting due to the tremors.

Grimsvotn last erupted in 2011, sending clouds of thick ash into the atmosphere, leading Iceland to temporarily close its airspace.

A year earlier, the country's Eyjafjallajokull volcano blew its top, an event that grounded thousands of flights across Europe for six days, amid fears that the ash could damage jet engines.
 
Point McKenzie, AK earthquake

Here's a article link with a reporting section that people describe what was felt. The best description was loud. It didn't seem very big otherwise, except for a couple jolts.

 
The last week was more quiet. There was 1 M6.2 in Vanuatu and 3 M6.1 in the same geographical region.
As for the usual area, there were 2 earthquakes out of 123 worldwide equal to or greater than 4.5 and 1423 out of 1875 quakes of all sizes worldwide.
Percentage: 75.9%
Another quiet week at least what concerns big quakes. There were none in the M6 and above range.
Regarding the usual area, there were 3 earthquakes out of 98 worldwide equal to or greater than 4.5 and 1626 out of 1973 quakes of all sizes worldwide.
Percentage: 82.4%
Earthquakes 7 days to Feb 28th  2021.gif

So quite an increase in small earthquakes despite the lull in bigger ones. Another area where there is a lot of activity though not appearing much on USGS is Iceland. That is an area to keep an eye on, not least because of the big volcanoes there.
 
Iceland. In a seldom occurring natural phenomenon, the tiny North Atlantic nation has seen over 10,000 quakes since last Wednesday, and the tremors are continuing.

The most violent of them so far have hit the capital area, as the tremors could be felt in the streets and homes of Reykjavik. Measuring 5.7 on the Richter scale, it is the most violent earthquake in the country for several years, Danish Radio reported.

According to Trine Dahl-Jensen, a senior researcher of earthquakes at the National Geological Survey of Denmark and Greenland (GEUS), such large swarms of earthquakes are rare even for Iceland, which is no stranger in that department.

So far, there is no sign the earthquakes are connected to volcanic activity, according to this source


From wikipedia: Earthquake swarms are indeed common in volcanic regions (for instance Japan, Central Italy, the Afar depression or Iceland), where they occur before and during eruptions. But they are also observed in zones of Quaternary volcanism or of hydrothermal circulation (for instance Vogtland/western Bohemia or the Vosges massif); or also—though less frequently—far from tectonic plate boundaries (Nevada, Oklahoma or Scotland). In all cases, high-pressure fluid migration in the Earth's crust seems to be the trigger mechanism and the driving process that govern the evolution of the swarm in space and time.[6][7]

 

Strong mag. 5.8 earthquake - North Pacific Ocean, 99 km east of Shikotan, Sakhalin Oblast, Russia

Date & time: 2 Mar 2021 21:22:47 UTC - 10 hours ago
Local time at epicenter: Wednesday, 3 Mar 2021 7:22 am (GMT +10)
Magnitude: 5.8
Depth: 39.0 km
Epicenter latitude / longitude: 44.03°N / 147.91°E
RU.png
(North Pacific Ocean, Russia)
Nearest volcano: Berutarube (91 km / 57 mi)
 
M 6.3 Greece (strong for Greece) - followed by an aftershock of M5.1:
M 6.3 - 10 km WNW of Týrnavos, Greece

USGS:
Time 2021-03-03 11:16:10 (UTC+01:00)
Location 39.764°N 22.176°E
Depth 10.0 km

One report 22km from epicentre: "Larissa . Walking on the street and couldn’t balance. Building were shaking. Dust was rising ."

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To add: As noted in this thread - the Tweet below is a more updated chart - there's a geomagnetic storm in progress so it's possible we may see an uptick in activity elsewhere too:
 
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