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Earthquakes

Seismograph

Very unusual seismic activity concerns scientists in South Korea

Korea earthquakes
© AP
Seismologists in South Korea are concerned about an unusual rash of earthquakes that have shaken the peninsula in recent weeks, with some suggesting that this sudden upsurge in seismic activity might be a precursor to a major — and potentially very destructive — earthquake.

The Korean Peninsula is not traditionally considered to be a part of the so-called Ring of Fire, the seismically active fault lines that run around the rim of the Pacific Ocean. However, seismologists are looking at whether shifting tectonic plates might become a new normal for the Koreas.

Last week, the Korea Meteorological Administration reported a magnitude 2.8 tremor in Wanju County, in the far southwest of South Korea. Although there was no damage reported from the weak quake and nobody was injured, this is the first time since December 2014 that a tremor with a magnitude above 2 has hit the region.

Seismograph

6.2 magnitude earthquake strikes central Mediterranean Sea

earthquake graph
© Phil McCarten / Reuters
Scientists say a strong earthquake struck in the central Mediterranean Sea region early on Thursday.

The Athens Institute of Geodynamics gave a preliminary magnitude of 5.9, while the European Mediterranean Seismological Centre (EMSC) said it measured 6.2.

The tremor was recorded at 2.43 a.m. on Thursday about 238 kilometers southwest of the coast of Pylos, in region of Messinia, at a depth of just 10 kilometers.

No damage or injuries have been reported so far.

Seismograph

'Anomalous seismic activity' and a tornado hit eastern Cuba

Cuba earthquakes
© Facebook/Enrique Diego Arango Arias
More than 20 earthquakes, some of them perceptible, and a tornado that caused material damage, were reported this Sunday in eastern Cuba.

According to the National Center for Seismological Research (CENAIS), until 7:30 pm (local time), 21 telluric movements had been registered in the eastern part of the island, "some of them perceptible by the population," in what is classified as "anomalous seismic activity."

The earthquakes were felt in the municipalities of Guamá, Palma Soriano, Tercer Frente, Contramaestre and Santiago de Cuba, in the province of Santiago de Cuba, in the municipalities of Media Luna, Bayamo and Bartolomé Masó, in the province of Granma, and in the city of Guantánamo in the province of the same name, reported CENAIS, which explains that so far no victims or material damage have been reported as a result of the quakes.

The largest of the tremors had a magnitude of 4.6 degrees and was recorded at 4:47 pm. It was located 20 kilometers south-southwest of the Santiago town of Chivirico, and just two hours later, a 4.2-magnitude aftershock was recorded. Both earthquakes are considered the seventh and eighth perceptible this year.

This seismicity, points out CENAIS, "corresponds to an activation of a segment of the Oriente fault to the south of the Guamá municipality, in the province of Santiago de Cuba."

Comment: Weird. We wonder how seismic activity may be linked to this tornado...


Seismograph

Sweden suffers one of its strongest earthquakes at Arctic iron ore mine

An aerial view of the Kiruna iron ore mine, where the earthquake hit
© LKAB.com
An aerial view of the Kiruna iron ore mine, where the earthquake hit.
Sweden has recorded its biggest ever earthquake caused by mining in the Arctic.

The quake measured magnitude 4.1 and forced the Kiruna mine, which is more than 100 years old, to be closed until further notice.

It is not the most powerful earthquake in Sweden overall, with the record held by an earthquake in Sjöbo in southern Sweden that measured 4.3.

Thirteen workers were in the mine when the tremor struck just after 3am on Monday, but no one was injured and all workers were able to drive out, local media said. The mine was quickly evacuated and all work stopped.

The epicentre was 1.9 miles (3 km) from the town, which is located in northern Sweden inside the Arctic Circle.

Several people in Kiruna reported noticing a severe tremor.

Fredrik Björkenwall, spokesperson for mine owners LKAB, said the quake could be felt around 12 miles (20 km) away.

Seismograph

Death toll in southwest China earthquake rises to four

SW China quake
© Chen Xinbo/Xinhua
A medical worker sprays disinfectants to collapsed houses in earthquake-struck Yakou Village in Xiaohe Township of Qiaojia County, Zhaotong, southwest China's Yunnan Province, May 19, 2020.
The death toll in a 5-magnitude earthquake that struck Qiaojia County in southwest China's Yunnan Province late Monday has risen to four, with 24 others injured, local authorities said Tuesday.

Rescue forces from the local public security, fire fighting, emergency response sectors have rushed to the quake zone.

The Yunnan provincial disaster reduction committee office and the provincial emergency response department have launched a level-four response for the disaster relief and sent a working group to the disaster area to assist and guide the earthquake relief work.

A mining rescue team from Zhaotong City is on the way to the disaster area. Meanwhile, the Zhaotong fire department has dispatched 91 fire fighters aided with 19 fire engines and four sniffer dogs to join the rescue.


Seismograph

Magnitude 6.5 earthquake rattles Nevada - UPDATE: Largest in 66 years

Screenshot of earthquake near Toponah, Nevada.
© USGS.gov
Screenshot of earthquake near Toponah, Nevada.
An earthquake with an initial magnitude of 6.4 hit Nevada on Friday morning, about 225 miles northwest of Las Vegas near the California border, the US Geological Survey says.

The quake occurred at 4:03 a.m. local time, the USGS says. It was 4.7 miles deep. At least four aftershocks were reported.It was about 35 miles west of the town of Tonopah, east of the Sierra Nevada range.

The earthquake was "widely felt," USGS spokesman Paul Laustsen told CNN."There have been almost 8,000 'Did you feel it' reports, with people logging into USGS to report it," Laustsen said.

Esmeralda County Sheriff's Deputy Jacob Stritenberger felt the main earthquake and it was the biggest one he's ever experienced, he said.Deputies are checking out reported damage on US 95."North- and southbound is undriveable around mile marker 89," Stritenberger said. "According to people who called it in, it's buckled really bad."

Comment: Comment:

Update:
On 16 May CNN reports:
An earthquake with a revised magnitude of 6.5 hit a remote area of Nevada on Friday morning, about 225 miles northwest of Las Vegas and near the California border, the US Geological Survey says.

The quake, which was 4.7 miles deep, occurred at 4:03 a.m. local time, the USGS says.The revised ranking makes the quake the first large one since 1954, said Graham Kent, director of the Nevada Seismological Laboratory.

"As the third most seismic state in the nation, we kind of had a streak of not having big earthquakes for 66 years," Kent said.

"This was a magnitude 6.5, and it was certainly felt in the Reno-Tahoe area, and also throughout the San Joaquin and Sacramento valleys in California," Kent said.

The USGS said in its aftershock forecast that there will be between 63 and 260 aftershocks with a magnitude of 3.0 or greater over the next seven days.



Seismograph

Very shallow M4.3 earthquake near Burra was South Australia's biggest in a decade

The earthquake struck at Burra, north of Adelaide
© Geoscience Australia
The earthquake struck at Burra, north of Adelaide.
An earthquake which has been felt widely across parts of South Australia is the biggest to have occurred in the state in the past decade, a seismologist says.

Geoscience Australia estimates the magnitude-4.3 earthquake happened between Burra and Clare, in the state's Mid North, at 3:23pm.

People felt shaking in Adelaide office and apartment buildings, as well as in the Adelaide Hills and Yorke Peninsula.

Geoscience Australia seismologist Hugh Glanville said it was the largest earthquake in the state for the past 10 years.

He said there were no reports of damage was so far, but it was felt from Mount Barker to Jamestown.

"It is possible for minor damage from a magnitude-4 but it's reasonably unlikely for this earthquake," he told ABC Radio Adelaide.

He said the earthquake happened at a "very shallow" depth of 3 kilometres.

Seismograph

Scientists closely monitor underwater volcano off Hawaii after rare earthquake swarm

Big Island earthquake swarm
© Hawaii News Now (screen capture)
Volcanologists are keeping a close eye on their instruments after a rare earthquake swarm off the Big Island the past two days.

Twenty miles off the southeast coast of the Big Island, Hawaii's newest volcano rises 10,000 feet from the ocean floor with its summit about 3,000 feet under the surface.

When Loihi starts shaking, scientists pay attention.

"Think of it as a younger version of Kilauea or Mauna Loa volcanoes," said David Phillips, deputy scientist in charge at Hawaiian Volcano Observatory.

Phillips said there's no significant hazard at the moment, but at one point HVO recorded 14 earthquakes per hour on the Loihi Seamount.

"The peak did take place yesterday afternoon, whether it continues to subside or come back is hard to say," Phillips said.

On a seismogram, more than a hundred temblors struck in the 2- to 3-magnitude range, suggesting magma is on the move.

Seismograph

6.6-magnitude quake hits 169 km SE of Lata, Solomon Islands

quake
An earthquake with a magnitude of 6.6 jolted 169 km southeast of Lata, Solomon Islands at 22:41:15 GMT on Tuesday, the U.S. Geological Survey said.

The epicenter, with a depth of 125.0 km, was initially determined to be at 12.1 degrees south latitude and 166.5 degrees east longitude.

Seismograph

M3.3 earthquake hits Rome as city emerges from lockdown

Fonte Nuova

An earthquake of magnitude 3.3 struck Fonte Nuova, 10 miles north of the Italian capital, at 5.03am on Monday - prompting calls to fire services but no reports of injuries or damage
A mild earthquake shook Rome on Monday morning as the city tries to adjust to life following coronavirus lockdown.

The quake had a magnitude of 3.3 and struck at 5.03am with an epicentre in Fonte Nuova, a small town around 10 miles outside the capital.

Firefighters said they had received numerous inquiries from people who had been shaken awake, but no reports of damage or injuries.

Residents reported hearing a loud roaring noise for around 30 seconds just before the shaking started, sending people scrambling into the streets.

'People woke up, screams of fright were heard from our building,' a man identified only as Fayruj told Italian news site AGI.

Comment: Just two weeks ago in Rome: Sinkhole opens up at Pantheon