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Tue, 20 Aug 2019
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Earthquakes

Seismograph

California and Nevada have experienced 240 earthquakes over 24 hours

California earthquakes
The unusual shaking on the west coast continues to intensify. As you can see from this map, 240 earthquakes have struck the states of California and Nevada over the last 24 hours. Yes, the west coast gets hit by quakes every day, but this is definitely an unusually high number. Fortunately, most of the earthquakes have been very small, but a couple of them were greater than magnitude 3.0. The following comes from the Los Angeles Times...
A magnitude 3.3 earthquake was felt in parts of Southern California on Sunday afternoon, one in a series of quakes to hit the Riverside County area.

The latest quake occurred at 4:36 p.m. and was centered on Glen Avon, south of Fontana. The seismic activity continued into Monday morning with dozens of new small quakes.

According to the U.S. Geological Survey, the quakes were felt across swaths of the Inland Empire, a region that has had hundreds of small quakes over the weekend, including one that registered a magnitude of 3.1.

Seismograph

6.1 magnitude earthquake rocks remote Japanese islands

Earthquake seismograph
An earthquake of 6.1 magnitude has rocked Japan's remote Ogasawara islands, Japan Meteorological Agency said on Tuesday.

The earthquake's epicenter lay at the depth of 440 km.

No injuries or damages were reported. A tsunami alert was initially issued but was cancelled several minutes later.

Seismograph

Strong 6.2 magnitude earthquake hits off Mindanao, Philippines

earthquake
A strong earthquake with a preliminary magnitude of 6.2 has struck off Mindanao island in the southern Philippines, seismologists and residents say. There were no immediate reports of serious damage or injuries.

The earthquake, which struck at 6:12 p.m. on Friday, was centered in the Philippine Sea off Governor Generoso, or 146 kilometers (90 miles) southeast of Davao City and 73 kilometers (45 miles) southeast of Mati.

The Philippine Institute of Volcanology and Seismology said the quake measured 6.2 and struck at a depth of 76 kilometers (47 miles), which is relatively deep. The U.S. Geological Survey (USGS) put the magnitude at 6.1.

There is no threat of a tsunami.

Seismograph

Powerful earthquake hits El Salvador: Tsunami warning after 6.8 magnitude tremor

People are being warned to take care as a road is completely destroyed

People are being warned to take care as a road is completely destroyed
Coastal areas are reportedly being evacuated after the earthquake struck off the coast, 40 km south of La Libertad, in the early hours of this morning

A 6.8 magnitude earthquake has hit El Salvador with coastal areas being evacuated amid a tsunami threat.

The earthquake struck off the coast, 40 km south of La Libertad, the US Geological Survey said.

Power outages have been reported in parts of the country after the tremor in the early hours of this morning.


Fish

'Disaster-predicting fish' spotted in Peru days before earthquake

Oarfish

Oarfish
The massive deep sea fish is popularly believed to appear on the ocean surface before an earthquake, with the creature's latest appearance possibly reinforcing this belief.

A magnitude 8 earthquake that struck northern Peru early on 26 May might've been preceded by a herald straight from ancient folk tales, the Daily Star reports.

Mere days before the disaster struck the South American country, and shortly before a similar calamity hit eastern Japan, a deep sea dweller known as the giant oarfish or king of herrings was discovered by locals washed up on Vichayito beach in the Peruvian town of Máncora.


Comment: Massive magnitude-8 earthquake strikes north-central Peru


Seismograph

Mag.8 earthquake strikes northern Peru

Massive 8 magnitude tremor strikes South America city

Massive 8 magnitude earthquake strikes Peru
A large earthquake with a preliminary magnitude of 8.0 struck north-central Peru early Sunday, the U.S. Geological survey reported.

The quake, at a moderate depth of 71 miles struck at 12:41 a.m. PDT, 50 miles southeast of the village of Lagunas and 98 miles east-northeast of the larger town of Yurimaguas.

There were no immediate reports of casualties or of major damage. Earthquakes that are close to the surface generally cause more destruction.


Comment: Update 27 May 2019

They're very fortunate that just one person has been killed, according to reports so far anyway.

Some more video footage of the damage caused by this mega-quake:








Seismograph

Do tiny tremblors on the West Coast signal a major earthquake?

California Hit By 39 Earthquakes
A series of tiny quakes rattling California and the Pacific Northwest may signal an upcoming catastrophic earthquake, seismologists say, KOIN reported.

Or experts say they might just be another reminder that the pressure's always building on fault lines beneath the West Coast, KATU reported.

"Those are just reminders," said Scott Burns, a Portland State University geology professor, according to the station. "We don't know what they mean. They are reminders that we are in earthquake country, and they may be precursors to the 'big one.'"

The tremors are indications of a "slow-slip" event, says Ken Creager, a University of Washington professor, KOMO reported.

In a slow-slip movement, which takes place every 14 months or so, a tectonic plate temporarily moves backward, causing a series of small quakes, KOIN reported.

Comment: San Andreas: A prepper's view of earthquake survival


Seismograph

Shallow 6.1 magnitude earthquake hits off Amatignak Island, Alaska

graph
Most important Earthquake Data:

Magnitude : 6.1

Local Time (conversion only below land) : Unknown

GMT/UTC Time : 2019-05-23 08:45:19

Depth (Hypocenter) : 27.79 km

Bizarro Earth

Largest underwater eruption ever recorded in the Indian Ocean

Underwater Volcano
© CNRS/IPGP-UNIVERSITÉ DE PARIS/IFREMER/BRGM
Multibeam sonar waves, reflecting off the sea floor near the French island of Mayotte, reveal the outline of an 800-meter-tall volcano (red) and a rising gas-rich plume.
Last week, Marc Chaussidon, director of the Institute of Geophysics in Paris (IPGP), looked at seafloor maps from a recently concluded mission and saw a new mountain. Rising from the Indian Ocean floor between Africa and Madagascar was a giant edifice 800 meters high and 5 kilometers across. In previous maps, there had been nothing. "This thing was built from zero in 6 months!" Chaussidon says.

His team, along with scientists from the French national research agency CNRS and other institutes, had witnessed the birth of a mysterious submarine volcano, the largest such underwater event ever witnessed. "We have never seen anything like this," says IPGP's Nathalie Feuillet, leader of an expedition to the site by the research vessel Marion Dufresne, which released its initial results last week.

The quarter-million people living on the French island of Mayotte in the Comoros archipelago knew for months that something was happening. From the middle of last year they felt small earthquakes almost daily, says Laure Fallou, a sociologist with the European-Mediterranean Seismological Centre in Bruyères-le-Châtel, France. People "needed information," she says. "They were getting very stressed, and were losing sleep."

The authorities knew little more. Mayotte has a seismometer, but triangulating the source of the rumblings would require several instruments, and the nearest others are several hundred kilometers away in Madagascar and Kenya. A serious scientific campaign started only in February, when Feuillet and her team placed six seismometers on the ocean bottom 3.5 kilometers down, close to the activity.

Info

New study gives more detailed picture of Earth's mantle

Earth's Mantle
© iStock/Getty Images Plus
The chemical composition of the Earth's mantle is a lot more variable and diverse than previously thought, a new study has revealed.

According to a new analysis of cores drilled through the ocean crust, the mantle is made up of distinct sections of rock each with different chemical make-ups.

The chemical composition of the mantle has been notoriously difficult to determine with a high degree of certainty because it is largely inaccessible.

Scientists have traditionally relied on lava that erupts on the ocean floor to give them some idea of what the mantle is made up of, and so far studies have suggested that it's chemically mostly the same everywhere on the planet.

However in their new study, published in Nature Geoscience, the team of researchers led by scientists at Cardiff University have studied the very first minerals that begin to form when lava first makes contact with the crust at mid-ocean ridges.