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Thu, 24 May 2018
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Earthquakes

Seismograph

Two shallow earthquakes above magnitude 5.0 strike off California coast

California earthquakes
© USGS
Two earthquakes, registering magnitudes of 5.8 and 5.0, struck within an hour of each other off the coast off California's Humboldt County on Tuesday morning, according to the U.S. Geological Survey.

The quakes were well beneath the ocean and there were no initial reports of damage or injury. The NOAA reported that no tsunami was expected from the quakes.

The two morning earthquakes struck two days after a magnitude 7.9 quake in the Gulf of Alaska, which resulted in a tsunami watch that was later canceled.

The 5.8 earthquake struck at 8:39 a.m. about 115 miles west of Eureka, Calif., at a depth of 5 kilometers. The closest quake to shore came at 9:24 a.m. and had a magnitude of 5.0, according to the USGS. That one had a depth of 4 kilometers and was about 112 miles west of Ferndale.

"Historically this is a very active area, " said Keith Knudsen, deputy director of the Earthquake Science Center at the USGS. He said the quakes occurred at "the boundary between two plates that are moving relatively fast, past each other and we call this area the Mendocino Triple Junction, which implies there are three plates, and there are, but these particular quakes occurred in a boundary between two plates."

Comment: Over the past seven days, California has experienced 15 earthquakes of magnitude 2.5 or greater up and down the state, including the two that hit off the coast in the Pacific Ocean. The California coast is part of the "Ring of Fire," an area where there are an abnormal number of underwater volcanoes. Made up of the Pacific coastline of the U.S., Asia and the Pacific Islands, this area is prone to earthquakes. There has been an uptick in seismic and volcanic activity in this region recently. See also: String of earthquakes and volcanic eruptions hits Ring of Fire - at least five events in two days
ring of fire map
© youtube.com



Bizarro Earth

New California geological data shows earthquake fault runs below Beverly Hill's famous shopping district

beverly hills rodeo drive earthquake fault
© Christopher Reynolds
The Santa Monica fault zone, capable of producing a magnitude 7 earthquake, cuts through the heart of the Westside, straddling or paralleling Santa Monica Boulevard through Century City and Westwood before veering due west.
New data from state geologists show that an earthquake fault runs below Rodeo Drive and Beverly Hills' shopping district, heightening the known seismic risk in an area famous for Cartier, Gucci, Prada and other luxury brands.

The California Geological Survey's final map has the Santa Monica fault zone cutting through the so-called Golden Triangle, running between Santa Monica and Wilshire boulevards.

Seismograph

Shallow magnitude 6.4 earthquake strikes off Russia's east coast

graph
An earthquake with a preliminary magnitude of 6.4 struck in the sea off eastern Russia on Thursday, the U.S. Geological Survey said.

The epicenter of the quake was 41 km (25 miles) east Nikol'skoye, Komandorskiye Ostrova, at a depth of about 10 km (6 miles), the USGS said. There were no immediate tsunami warnings issued after the quake.

Dominoes

String of earthquakes and volcanic eruptions hits Ring of Fire - at least five events in two days

tsunami alert Alaska
© Michael Armstrong / Homer News via AP
Abdulai Salam and his daughter Mina wait for the all-clear at Homer High School during a tsunami alert for Homer, Alaska at about 2:30 a.m., Jan. 23, 2018.


Volcanic eruptions in Japan, the Philippines and Bali. Massive earthquakes in Alaska and Indonesia.


The rash of natural disasters over the past two days have one common denominator: they all occurred along the so-called Ring of Fire, a sprawling horseshoe-shape geological disaster zone.


Comment: A geologist from the US Geological Survey says these events are not connected - yet they all took place in rapid succession in the Ring of Fire, which is constantly active. So what he actually means is that he doesn't know if they are directly connected - although evidently they are connected by the Ring of Fire itself.

While we appreciate that he is trying to be cautious with his words, he should at least acknowledge the obvious: That the events are at least indirectly connected, and that it is possible - even likely - that there is also a direct connection given that they all happened within two days. And if so, what could that mean?

More on the Ring of Fire:


Seismograph

6.4 magnitude earthquake hits off of Japan

Shaken: Earthquake of magnitude 6.4 struck 64 miles off the coast, at depth of 40 miles

Shaken: Earthquake of magnitude 6.4 struck 64 miles off the coast, at depth of 40 miles
An earthquake of magnitude 6.4 struck off Japan on Wednesday, the United States Geological Survey said.

There were no immediate reports of damage or casualties from the quake, which hit 103 km (64 miles) northeast of the island of Honshu, at a depth of 64 km (40 miles).

Japan lies in the 'Ring of Fire', a line of seismic faults surrounding the Pacific Ocean where earthquakes and volcanic activity are common.

In the past two days, several major earthquakes have been recorded on the Ring of Fire, including off the coasts of Alaska and Indonesia.

On Tuesday morning, a 7.9 magnitude earthquake struck some 170 miles southeast of Kodiak Island in the Gulf of Alaska, US.

Seismograph

Tsunami warning for US and Canadian Pacific coast after 8.2 magnitude earthquake strikes in Gulf of Alaska - UPDATE

Alaska earthquake
© unknown
A map from the USGS shows where an earthquake struck near Alaska, prompting a tsunami warning for B.C.'s coast
A tsunami warning has been posted for the coast of British Columbia and Alaska following a powerful earthquake in the Gulf of Alaska.

The U.S. Geological Survey says the quake has a preliminary reading of 8.2 and struck 278 kilometres southeast of Kodiak, Alaska, at a depth of about 10 kilometres.

Environment Canada says the tsunami warning covers the Central Coast and Northeast Vancouver Island coast, including Kitimat Bella Coola and Port Hardy

The weather agency says people in coastal areas are at risk and should move to high ground now and heed further instruction from local authorities.

Seismograph

Powerful 6.0 magnitude earthquake hits off coast of Java, Indonesia

Alert area: 81 km SouthWest Lebak Banten, 100 km SouthWest Pandeglang, Banten, 108 km SouthWest Bogor, West Java, 125 km SouthWest Serang-Banten, and 153 km SouthWest Jakarta-Indonesia

Alert area: 81 km SouthWest Lebak Banten, 100 km SouthWest Pandeglang, Banten, 108 km SouthWest Bogor, West Java, 125 km SouthWest Serang-Banten, and 153 km SouthWest Jakarta-Indonesia
Buildings shake as tremors felt in Jakarta over 60 miles from epicentre

A moderately strong earthquake shook the Indonesian island of Java and the country's capital Jakarta on Tuesday.

There were no immediate reports of damage or injuries.

According to the US Geological Survey, the 6.0 magnitude quake was centered offshore western Java at a depth of about 43 kilometres (27 miles). The epicentre was about 153 kilometres (95 miles) southwest of Jakarta.

According to Indonesia's Department of Meteorology, Climate and Geophysics, the quake didn't have the potential to generate a tsunami and no warning was issued.

Seismograph

Mystery grows as earthquake swarm in Reno, Nevada lasts 7 days straight

earthquake swarm Reno 2018

More than 250 earthquakes hit South Reno, Nevada since January January 12, 2018.
In the past month, parts of Reno, Nevada, have experienced a total of 274 known earthquakes. But if you're surprised you haven't heard about them by now, consider that the vast majority of those have been truly tiny tremors-just five of those quakes have been stronger than a magnitude 2.0, which means they've mostly been too gentle to feel. Some have even been so tiny that seismological networks haven't even alerted scientists there has been a quake. Instead, they've pored through data to identify the small quivers.

According to Ken Smith, an earth scientist at the University of Nevada Reno's Nevada Seismological Laboratory, the swarm kicked off on December 18, then quieted down until January 12. Then seismological activity picked back up and has continued since, although in the past day or so the tremors have slowed down again. "Things are starting to cool off a little bit, so that's good news," Smith told Newsweek.

Comment:


Seismograph

Magnitude 6.3 earthquake jolts northern Chile

Chile earthquake
© USGS
The temblor, which was deep at 110 kilometres, struck at 10:06 p.m. local time on Saturday, epicentred at Tarapaca

The US Geological Survey says a magnitude 6.3 earthquake has struck northern Chile.

The quake, which was deep at 110 kilometres, struck at 10:06 p.m. local time on Saturday. The epicentre in Tarapaca was 76 kilometres east of the city of Putre, and 118 kilometres southeast of the Peruvian city of Tacna.

No tsunami threat

Local media in Chile said there were no immediate reports of damage and that the navy's oceanographic service had discarded the possibility of a tsunami.

An earthquake with a similar strength shook Tarapaca last October.

Alarm Clock

Earthquake swarm hits South Reno, Nevada - More than 230 quakes and counting

South Reno earthquake swarm
South Reno has been shaking, ever so gently, for six days now.

If you live there - near Galena High School or where the Mount Rose Highway goes below the I-580 - you likely haven't felt much, if anything. But earthquake detecting instruments in the area have picked up more than 230 small temblors since late last Thursday.

The largest in the swarm so far, which hit Tuesday afternoon, measured a 2.7 on the Richter scale - a magnitude that University of Nevada, Reno seismologist Ken Smith described as "pretty small."

"You'd have to be right above it to really feel anything," he said, noting they've gotten a few dozen reports from people who've felt the jolts.

While earthquakes in Northern Nevada are commonplace (The Silver State is the third-most seismically active state in the nation), Smith said he and his colleagues at UNR's Nevada Seismological Laboratory pay special attention to earthquake swarms.

Comment: In recent months we have seen other areas of the US experiencing these swarms of mini-earthquakes as well: