Earthquakes around the world

Gaby

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There was an earthquake near Andorra a few days ago. It was described as the strongest earthquake of this century for the region with 4.5 in the scale of Richter. Not a big one, but the region has been relatively calm during the past century or so.

 

sToRmR1dR

The Living Force
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Magnitude 5.3 Earthquake Rocks Hawaiian Islands - USGS
14.04.2019

The epicentre of the tremor was located about 15 miles (24 kilometres) southwest of the city of Kailua-Kona at a depth of 10 miles (16 kilometres).

According to the US Geological Survey (USGS), a 5.3-magnitude quake has occurred near the Big Island of Hawaii. However, the Pacific Tsunami Warning Centre of the National Weather Service has noted there is no tsunami danger.

At the moment, no victims or major damage have been reported, the quake, however, was felt by many people in the area.


 

sToRmR1dR

The Living Force
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BREAKING:

Strong Earthquake Hits Taiwan, Subway Services in Taipei Suspended

According to a local central weather bureau, Taipei area has been rocked by some 4-magnitude quake. There have been no immediate reports of casualties or damage to the buildings so far.

According to the US Geological Survey, a strong 6.4-magnitude earthquake has rocked eastern Taiwan. A 6.1-magnitude quake was registered in the Hualien County on the eastern coast of Taiwan, the China Earthquake Networks Center (CENC) said on Thursday.

All subway services have been temporarily suspended in Taipei due to the earthquake, local media reported. The quake measures 4 magnitude in the Taipei.

The seismological activity took place at about 1 p.m. local time (05:00 GMT) at the depth of about 50 kilometers (31 miles).
There have been no immediate reports of damage or injuries as a result of the quake.

DETAILS TO FOLLOW
 

c.a.

The Living Force
FOTCM Member
Translated from Spanish by Microsoft
Map of intensities of the M 5.7 preliminary earthquake (SSN). At least 5 earthquakes have been registered in the area of Cuajinicuilapa (Gro)-Pinotepa (Oax).


First medium aftershock:

Translated from Spanish by Microsoft
Preliminary SSN 15:45 H earthquake: magnitude 4.8 with epicenter 69 km southwest of Pinotepa Nacional, Oaxaca.
 

sToRmR1dR

The Living Force
FOTCM Member
Earthquake of 5.4 magnitude registered off Japan's coast
April 23, 2019

MOSCOW, April 22. /TASS/. /TASS/. An earthquake of 5.4 magnitude has been registered off Japan's coast, US Geological Survey reported on Monday.

The earthquake's epicenter lay in about 190 kilometers to the north-east of the city of Miyako in the Iwate Prefecture at the depth of 10 kilometers.

No injuries or damages were reported, and no tsunami alert was issued.

Earthquake of 5.4 magnitude registered in Mexico's south
April 23, 2019

MOSCOW, April 22. /TASS/. /TASS/. An earthquake of 5.4 magnitude has been registered in the south of Mexico, US Geological Survey reported on Monday.

The earthquake's epicenter lay in 283 km to the south of the city of Puebla de Zaragoza at the depth of 21 km.

Reuters reported that shaking was felt in several parts of Mexico City.

According to Reuters, head of Mexico's civil protection agency David Leon said that there were no initial reports of damage or injuries.

Earthquake of 5.3 magnitude registered off Canada's west coast
April 23, 2019

OTTAWA, April 23. /TASS/. An earthquake of 5.3 magnitude has been registered off Canada's west coast, Earthquakes Canada reported on Tuesday.

The first earthquake was registered at 1:27pm local time in 166 km to the west from Port Alice in British Columbia. In about an hour, another earthquake was registered in 189 km to the west of Port Alice at the depth of 10 km.

No injuries or damages were reported, and no tsunami threat was issued.

6.6 Magnitude Earthquake Strikes South Philippines - USGS
23.04.2019

On Monday, a 6.3-magnitude earthquake occurred one kilometre north-northeast of Gutad, Philippines, killing eleven people.

According to the United States Geological Survey, a magnitude 6.6 earthquake hit the South Philippines. The quake took place at 05:37 GMT some 140 miles southwest of Cebu City. The epicenter of the earthquake was located at the depth of 53 miles.

There were no immediate reports of casualties or damage.


The Philippines is situated in the so-called "Ring of Fire", a seismically-active zone of volcanoes and fault lines circling the edges of the Pacific Ocean.
 

c.a.

The Living Force
FOTCM Member
Mid- Snip 5-7 minute Read:
Their efforts, published online by the journal Science on April 18, expand the earthquake catalog for that region and period of time by a factor of 10—growing it from about 180,000 recorded earthquakes to more than 1.81 million. The new data reveal that there are about 495 earthquakes daily across Southern California occurring at an average of roughly three minutes apart. Previous earthquake cataloging had suggested that approximately 30 minutes would elapse between seismic events.

This 10-fold increase in the number of recorded earthquakes represents the cataloging of tiny temblors, between negative magnitude 2.0 (-2.0) and 1.7, made possible by the broad application of a labor-intensive identification technique that is typically only employed on small scales. These quakes are so small that they can be difficult to spot amid the background noise that appears in seismic data, such as shaking from automobile traffic or building construction.

"It's not that we didn't know these small earthquakes were occurring. The problem is that they can be very difficult to spot amid all of the noise," says Zachary Ross, lead author of the study and postdoctoral scholar in geophysics, who will join the Caltech faculty in June as an assistant professor of geophysics. Ross collaborated with Egill Hauksson, research professor of geophysics at Caltech, as well as Daniel Trugman of Los Alamos National Laboratory and Peter Shearer of Scripps Institution of Oceanography at UC San Diego.

To overcome the low signal-to-noise ratio, the team turned to a technique known as "template matching," in which slightly larger and more easily identifiable earthquakes are used as templates to illustrate what an earthquake's signal at a given location should, in general, look like. When a likely candidate with the matching waveform was identified, the researchers then scanned records from nearby seismometers to see whether the earthquake's signal had been recorded elsewhere and could be independently verified.

 

c.a.

The Living Force
FOTCM Member





Meanwhile:
Translated from Spanish by Microsoft
After several days of relative calm, the #Popocatépetl present continuous emission of vapour, gas and slight ash content moving to the north between Pue And Edo Mex.
 

c.a.

The Living Force
FOTCM Member





https://twitter.com/rangefront/status/1124176872911228928
Abstract: Gravitational body forces focus North American intraplate earthquakes
Earthquakes far from tectonic plate boundaries generally exploit ancient faults, but not all intraplate faults are equally active.

The North American Great Plains exemplify such intraplate earthquake localization, with both natural and induced seismicity generally clustered in discrete zones.

Here we use seismic velocity, gravity and topography to generate a 3D lithospheric density model of the region; subsequent finite-element modelling shows that seismicity focuses in regions of high-gravity-derived deviatoric stress. Furthermore, predicted principal stress directions generally align with those observed independently in earthquake moment tensors and borehole breakouts.

Body forces therefore appear to control the state of stress and thus the location and style of intraplate earthquakes in the central United States with no influence from mantle convection or crustal weakness necessary. These results show that mapping where gravitational body forces encourage seismicity is crucial to understanding and appraising intraplate seismic hazard.

John Louie, Geol 757, Advanced Seismic Imaging and Tomography class lectures. Southern Cal / 49:47
 
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