Earthquakes around the world

During the past 24 hours, there were 1 quake of magnitude 5.2, 27 quakes between 4.0 and 5.0, 199 quakes between 3.0 and 4.0, and 385 quakes between 2.0 and 3.0. There were also 385 quakes below magnitude 2.0 which people don't normally feel.

Biggest quake today: 5.2 quake Solomon Sea, 121 km south of Kokopo, East New Britain Province, Papua New Guinea, Oct 25, 2021 3:21 pm (GMT +10) 10 hours ago

Most recent quake: 3.0 quake La Palma Island, 13 km southeast of Los Llanos de Aridane, Spain, Oct 25, 2021 3:44 pm (GMT +1) 19 minutes ago

Earthquakes Today: latest earthquakes worldwide during the past 24 hours on Monday, October 25, 2021 - list, stats and interactive map
 
During the past 24 hours, there were 3 quakes of magnitude 5.0 or above, 38 quakes between 4.0 and 5.0, 161 quakes between 3.0 and 4.0, and 276 quakes between 2.0 and 3.0. There were also 388 quakes below magnitude 2.0 which people don't normally feel.

Biggest quake today: 5.6 quake South Pacific Ocean, New Zealand, Oct 26, 2021 6:10 pm (GMT -12) 3 hours 52 minutes ago

Most recent quake: 2.5 quake 2.7 mi southwest of Pāhala, Hawaii County, USA, Oct 26, 2021 11:46 pm (GMT -10) 16 minutes ago

Earthquakes Today: latest earthquakes worldwide during the past 24 hours on Wednesday, October 27, 2021 - list, stats and interactive map

La Palma Update


This seems to correlate with with an increase of earthquakes in the last 24 hours. There were 4 quakes between magnitudes 4.0-4.7 alone in addition to 130 ones at magnitudes around 2.5-3.9.
One of the magnitude 4 quakes occurred early this morning at shallow depth of 13 km, which is thought to be the main reservoir of the magma before it rises to the vents.

Quakes precede phases of intensification?

It seems that such upticks of quake activity precedes phases with increased lava supply several hours later. This might fit into the following model: first, magma pressure at depth increases either by surges from new magma arriving there or from temporary blockages in the paths above, preventing a sufficient release of it at the eruption; then, the pressure on the surrounding rocks create new cracks and paths, which shows up as quakes. 3rd, the magma then then rises through new and existing conduits until it reaches the surface hours later.

La Palma, Canary Islands: eruption and seismic crisis Sep 2021 - news and activity updates
 
Something is happening deep in the Earth too. An EQ has been measured 467 miles beneath Japan. Deepest one ever recorded.


Deepest earthquake ever detected struck 467 miles beneath Japan​



japan-earthquake-deepest-tremor-467-miles-under-country-magntitude-7-ogasawara-3722859.jpg


If confirmed, the temblor would be a shock to geologists who thought rocks that deep inside Earth were too putty-like to break and shake.

One spring evening six years ago, hundreds of miles underground, our planet began to rumble from a series of peculiar earthquakes. Most of Earth's temblors strike within a few dozen miles of the surface, but these quakes stirred at depths where temperatures and pressures grow so intense that rocks tend to bend rather than break.

The first jolt, which struck off the coasts of Japan's remote Bonin Islands, was recorded at magnitude 7.9 and up to 680 kilometers (423 miles) underground, making it one of the deepest quakes of its size. Then another oddity emerged in the cascade of aftershocks that followed: a tiny temblor that, if confirmed, would be the deepest earthquake ever detected.

The ultradeep quake, described recently in the journal Geophysical Research Letters, is estimated to have struck some 751 kilometers (467 miles) beneath the surface in the layer of our planet known as the lower mantle, where scientists have long thought earthquakes unlikely, if not impossible. While there have been hints of lower mantle quakes before, researchers have struggled to pinpoint them within this layer of the Earth.

"This is by far the best evidence for an earthquake in the lower mantle," says Douglas Wiens, a seismologist specializing in deep quakes at Washington University in St. Louis who wasn't part of the study team.

Some scientists caution that more research is needed to confirm the quake is real and did indeed strike in the lower mantle. While the boundary sits an average of 660 kilometers (410 miles) underground, it can vary around the globe. Under Japan, the lower mantle is believed to start about 700 kilometers (435 miles) down. The team detected several aftershocks around this depth—but one particular quake sat well beyond.

While deep quakes don't cause the same kind of devastation as their shallow counterparts, studying these events can help scientists decipher the enigmatic ways our planet shifts far beneath our feet. Seismic shudders are among the few windows into our planet's interior workings—and each unexpected happening, like a quake in the lower mantle, could offer new views into the underworld.

Rare lower mantle quakes may be possible in particular conditions, says Heidi Houston, a geophysicist and deep quake expert at the University of Southern California who was not part of the study team. "It can't be ruled out," she says. "That's one of the things that makes this interesting and exciting and important to look into."

Rumbles from the deep

The magnitude 7.9 temblor was an oddity on its own. The great depth and large size of this quake shook the Earth near and far. Populations across all of Japan's 47 prefectures reported feeling the earthquake, which is a first in more than 130 years of record-keeping.

In contrast, the vast majority of quakes are shallow. Of the 56,832 moderate to large earthquakes recorded between 1976 and 2020, only about 18 percent were deeper than 70 kilometers (43 miles). Even fewer, some four percent, struck below 300 kilometers (186 miles), which is the depth commonly used as a cut-off for identifying "deep earthquakes."


467.jpg
Jason Treat and Katie Armstrong, NG Staff.
Sources: Zhongwen Zhan, Annual Review of Earth and Planetary Sciences, 2019;
Global Centroid Moment Tensor database.


For nearly a century—since English astronomer and seismologist Herbert Hall Turner spotted the first deep quake in 1922—scientists have puzzled over how these quakes can happen at all.

Near the surface, tectonic plates' slow-motion battles build up stress until the ground fractures and shifts, sending out the shudders of an earthquake. Deep in Earth's underbelly, however, high pressures prevent similar jolts. "Everything is just very strongly compressed in all directions," Houston says.

Add in the sizzling temperatures deep underground, and rocks act more like putty than solid chunks, says Magali Billen, a geodynamicist at the University of California, Davis, who was not part of the new study. She demonstrates this during a video interview using a bubble-gum pink lump of Silly Putty. As she draws it out slowly, it stretches and flows into ropey strands. But if rapidly deformed, “that’s when it breaks,” Billen says. She yanks swiftly on the rosy blob and, with a faint pop, it splits in two

"What is it that makes that happen?" Billen asks.

To explore this question, University of Arizona seismologist Eric Kiser and his colleagues took a closer look at the large quake under the Bonin Islands, which lit up seismometers around the world, including Japan's dense network known as the Hi-Net array.

The team sifted through Hi-Net's trove of data in search of tremors that followed in the wake of the big quake. Such a large event would send energy ricocheting through the subsurface, which can obscure small aftershocks. To amplify the small signals amid all the noise, the researchers used a method known as back-projection, which allows them to stack the data from multiple seismometers. Sure enough, four aftershocks rumbled between 695 and 715 kilometers deep, and another stood apart from the pack: a quake 751 kilometers underground.
 
During the past 24 hours, there were 1 quake of magnitude 5.0, 21 quakes between 4.0 and 5.0, 215 quakes between 3.0 and 4.0, and 282 quakes between 2.0 and 3.0. There were also 415 quakes below magnitude 2.0 which people don't normally feel.

Biggest quake today: 5.0 quake South Pacific Ocean, 192 km south of Nuku'alofa, Tongatapu, Oct 28, 2021 7:03 pm (GMT +13) 8 hours ago

Most recent quake: 2.9 quake La Palma Island, 14 km southeast of Los Llanos de Aridane, Spain, Oct 28, 2021 2:49 pm (GMT +1) 16 minutes ago

Earthquakes Today: latest earthquakes worldwide during the past 24 hours on Thursday, October 28, 2021 - list, stats and interactive map

Since 7 October seismic activity reached M 4> at La Palma. In the last few days this has further intensified.

IMG_20211028_090819_088.jpg
 
These events of coronal mass ejections with direct hit to earth magnetic field are related to seismic events of great magnitude. Watch for possible increase in seismic or volcanic activity



Powerful eruptions on the Sun might trigger earthquakes

Large earthquakes all around the world are not evenly distributed … there is some correlation among them,” says Giuseppe De Natale, research director at the National Institute of Geophysics and Volcanology in Rome and co-author of the new study. “We have tested the hypothesis that solar activity can influence the worldwide [occurrence of earthquakes].”

A solar origin for earthquakes​

To the unaided eye, the Sun might seem relatively docile. But our star is constantly bombarding the solar system with vast amounts of energy and particles in the form of the solar wind. Sometimes, however, formidable eruptions on the Sun’s surface cause coronal mass ejections, or especially energetic floods of particles — including ions and electrons — that careen through the solar system at breakneck speeds. When they reach Earth, these charged particles can interfere with satellites, and under extreme circumstances, take down power grids. The new research suggests that particles from powerful eruptions like this — specifically, the positively charged ions — might be responsible for triggering groups of strong earthquakes.
 
#Ultimora-#Terremoto in Central Italy with a provisional magnitude between 4.2 and 4.7
Link
An earthquake of magnitude 4.3 (and depth of 38 km) was felt at 12.53 in the area between Pesaro and Urbino. In particular in Osimo, Ancona, Jesi felt very strong. There are those who speak of having perceived 'an absurd beating', from the third floor of a building. The shock was felt as far as Albania.

It was a short but intense shock as reported on twitter by Ingvterremoti followers. The epicenter was in the province of Pesaro Urbino 3 km north of Montefelcino. The strong shock was felt throughout the Pesarese and also in the province of Ancona. Many calls to the fire brigade but at the moment there are no reports of damage or injuries.

In Montefelcino, just 3 kilometers from the epicenter, the citizens took to the streets and the middle schools and the elementary school of the Municipality were evacuated. Carabinieri are being monitored on the city streets.

Throughout the province of Pesaro-Urbino and up to that of Ancona, the shock has pushed many citizens into the streets. At 12.56 a second earthquake of magnitude 2.7 was recorded with the epicenter of Serrungarina, a municipality also in the province of Pesaro-Urbino, which is just under 9 kilometers from Montefelcino. The area affected by the tremors is on the border with the province of Perugia.

INVOLCAN scientists get up early every day to analyze the deformation and the dozens of earthquakes that have occurred during the night
These events of coronal mass ejections

Oct 29, 2021
 
During the past 24 hours, there were 2 quakes of magnitude 5.0 or above, 32 quakes between 4.0 and 5.0, 146 quakes between 3.0 and 4.0, and 360 quakes between 2.0 and 3.0. There were also 451 quakes below magnitude 2.0 which people don't normally feel.

Biggest quake today: 5.1 quake Gulf of Alaska, 61 mi east of Sandpoint, Aleutians East, Alaska, USA, Oct 28, 2021 11:06 am (GMT -8) 18 hours ago

Most recent quake: 3.0 quake CANARY ISLANDS, SPAIN REGION, October, 29 2021 13:25 GMT 7 minutes ago

Earthquakes Today: latest earthquakes worldwide during the past 24 hours on Friday, October 29, 2021 - list, stats and interactive map
 
During the past 24 hours, there were 6 quakes of magnitude 5.0 or above, 30 quakes between 4.0 and 5.0, 149 quakes between 3.0 and 4.0, and 267 quakes between 2.0 and 3.0. There were also 405 quakes below magnitude 2.0 which people don't normally feel.

Biggest quake today: 5.8 quake Indian Ocean Oct 30, 2021 6:03 pm (GMT +9) 5 hours ago




Most recent quake: 3.5 quake La Palma Island, 14 km southeast of Los Llanos de Aridane, Spain, Oct 30, 2021 2:39 pm (GMT +1) 18 minutes ago

Earthquakes Today: latest earthquakes worldwide during the past 24 hours on Saturday, October 30, 2021 - list, stats and interactive map
 
La Palma experienced a quake in the morning 7:24 am (GMT+1) on October 30, but was it a magnitude 5.1, 5.0, 4.1 or 4.5? Did it happen at a depth of 5, 35, 39, or 40 km, and where exactly was the epicenter?
Interesting how an event can be listed in different ways. Perhaps the need for immediate reporting affects the initial accuracy. One could also imagine that national services and institutes may be more invested in analyzing their data after event and update their information, but in certain circumstances one can also imagine national services would be subject to political pressure.

Volcanodiscovery.com had:
Moderate magnitude 5.0 earthquake at 35 km depth
30 Oct 06:29 UTC: First to report: VolcanoDiscovery after 5 minutes.
30 Oct 06:29: Now using data updates from EMSC
30 Oct 06:30: Now using data updates from IGN
30 Oct 06:37: Magnitude recalculated from 4.5 to 5.1. Hypocenter depth recalculated from 5.0 to 39.0 km (from 3.1 to 24 mi). Epicenter location corrected by 21 km (13 mi) towards W.
30 Oct 07:31: Magnitude recalculated from 5.1 to 5.0. Hypocenter depth recalculated from 39.0 to 35.0 km (from 24 to 22 mi). Epicenter location corrected by 1.2 km (0.8 mi) towards NW.
Update Sat, 30 Oct 2021, 06:33
Moderate magnitude 4.5 earthquake 18 km southeast of Santa Cruz de La Palma, Spain
4.5 quake 30 Oct 7:24 am (GMT +1)

4.5 quake 30 Oct 7:24 am (GMT +1)
A magnitude 4.5 earthquake near Santa Cruz de La Palma, La Palma Island, Canary Islands, Spain, was reported only 9 minutes ago by Spain's Instituto Geográfico Nacional (IGN), considered the main national agency that monitors seismic activity in this part of the world. The earthquake occurred at a very shallow depth of 5 km beneath the epicenter in the morning on Saturday, October 30th, 2021, at 7:24 am local time. 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.
Our monitoring service identified a second report from the European-Mediterranean Seismological Centre (EMSC) which listed the quake at magnitude 4.5 as well.
Based on the preliminary seismic data, the quake was probably felt by many people in the area of the epicenter. It should not have caused significant damage, other than objects falling from shelves, broken windows, etc.
In Mazo (pop. 4,800) located 16 km from the epicenter, Breña Baja (pop. 4,200) 18 km away, Brena Alta (pop. 7,100) 18 km away, and Santa Cruz de La Palma (pop. 17,100) 18 km away, the quake should have been felt as light shaking.
Weak shaking might have been felt in Garachico (pop. 6,000) located 26 km from the epicenter, El Paso (pop. 7,100) 27 km away, Los Llanos de Aridane (pop. 20,800) 31 km away, and Tazacorte (pop. 5,700) 32 km away.
VolcanoDiscovery will automatically update magnitude and depth if these change and follow up if other significant news about the quake become available. If you're in the area, please send us your experience through our reporting mechanism, either online or via our mobile app. This will help us provide more first-hand updates to anyone around the globe who wants to know more about this quake.
EMSC-CSEM has it as a 4.1 happening at 40 km
MagnitudeML 4.1
RegionCANARY ISLANDS, SPAIN REGION
Date time2021-10-30 06:24:21.4 UTC
Location28.67 N ; 17.77 W
Depth40 km
Distances143 km W of La Laguna, Spain / pop: 150,000 / local time: 07:24:21.4 2021-10-30
15 km ENE of Los Llanos de Aridane, Spain / pop: 20,700 / local time: 07:24:21.4 2021-10-30
Global view
Source parameters reviewed by a seismologist


More information at:

1635596927688.pngInstituto Geografico Nacional Madrid, Spain
Instituto Geografico National, Spain, said had a 5.0 at a depth of 35 km
es2021vgjrv30/10/202106:24:2307:24:2328.5707-17.8396355.0mbLgIV-VSW VILLA DE MAZO.ILP
With a link that lead to:

Información del terremoto​

EventoFechaHora UTCHora Local
(*)
LatitudLongitudProfundidad
(km)
MagnitudTipo Mag.Int. max.Localización
es2021vgjrv30/10/202106:24:2307:24:2328.5707-17.8396355.0mbLgIV-VSW VILLA DE MAZO.ILP
Foto Detalle
Ampliar © Instituto Geográfico Nacional
USGS noted a quake of 4.0 on Crete but had nothing to say about a quake on La Palma.

In Portugal, Instituto Português do Mar e da Atmosfera registered a 4.1 at a depth of 40 km
2021-10-30 06:24:2328.54 N17.91 W40 km4.1Canary Islands, Spain RegionIPMA

Different sources have different information. In this instance it seems there was a quake, at a depth of 35-40 km and of a magnitude of between 4.1 to 5.1 and at a location that shifted more than 20 km, during the calculations that followed the first reports.

Whether the depth happened at 5 or 40 km can be important. It turns out that a shallow quake can be relatively more damaging than deeper quakes. In the article, How shallow, deep earthquakes differ by Alicia Chang from Associated Press Aug 25, 2016, she explains that deeper quakes for the same magnitude are felt over a wider area, but are usually less destructive than quakes near the surface.
 
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