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Thu, 17 Oct 2019
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Earthquakes


Seismograph

Scientists discover big storms can create 'stormquakes'

This satellite image shows Hurricane Michael on Oct. 9, 2018, as it enters the Gulf of Mexico
© NOAA
This satellite image shows Hurricane Michael on Oct. 9, 2018, as it enters the Gulf of Mexico. It made landfall near Mexico Beach in the Panhandle as a Category 5 storm. Florida State University professor Wenyuan Fan said the storm probably created "stormquakes" offshore in the gulf, too.
Scientists have discovered that the sea floor shakes during hurricanes and nor'easters, with a rumbling as strong as a magnitude 3.5 earthquake.

They've dubbed the phenomenon "stormquakes."

The scary sounding mash-up was detailed in research by Florida State University scientists published this week in the journal Geophysical Research Letters.

The shaking of the sea floor during hurricanes and nor'easters can last for days, according to the study. While fairly common, the quakes weren't noticed before because they were considered seismic background noise.

A stormquake is more an oddity than something that can hurt you, because no one is standing on the sea floor during a hurricane, said Wenyuan Fan, a Florida State University seismologist who was the study's lead author.

The combination of two frightening natural phenomena might bring to mind "Sharknado," but stormquakes are real and not dangerous.

Comment: A few days ago as Typhoon Hagibis slammed into southern Japan, Tokyo was simultaneously hit by 5.3M earthquake.


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Powerful shallow 6.4-magnitude earthquake rattles the Philippines sending people running into the streets as officials warn of aftershocks

The quake struck about 40 miles north of General Santos, Mindanao. Patients were seen fleeing from a hospital and a shopping mall as the tremor struck

The quake struck about 40 miles north of General Santos, Mindanao. Patients were seen fleeing from a hospital and a shopping mall as the tremor struck
A powerful 6.4-magnitude earthquake has rattled the Philippines' second biggest island today, sending hundreds rushing out of a shopping mall and patients fleeing a hospital

The quake struck about 40 miles north of General Santos, Mindanao, the United States Geological Survey (USGS) reported.

Local media said an elderly man was injured after being struck by a falling object during the early evening quake.

The man received treatment after being injured, ABS-CBN television reported from the scene.


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Moderate quake wakens San Francisco, Twitter flooded with witness reports

Map of San Francisco, CA
© USGS
Residents of San Francisco and the Bay Area were shaken from their sleep by a 3.9-magnitude earthquake. Luckily, this time the quake triggered only memes and videos from rudely awoken San Franciscans.

The tremor struck just 6km (3.7 miles) off the coast of Colma, just south of San Francisco, on Saturday morning, according to the US Geological Service. An earthquake of this magnitude is strong enough to cause minor damage, but typically results in only shaking and rattling of objects indoors.

It's not just the living that were disturbed from their sleep. Colma, the town closest to the epicenter, is home to more than 1.5 million dead bodies. Founded as a necropolis in 1924, the dead outnumber the living in Colma by nearly a thousand to one.

Map

Earthquake swarms impact Texas, Oklahoma, San Francisco and New Madrid fault zone

new madrid fault zone
There is a whole lotta shaking going on in America right now, and many people are concerned about what that could potentially mean. Could it be possible that the U.S. is entering a more seismically active time? This week alone, we have seen earthquake swarms in Texas, Oklahoma, San Francisco and the New Madrid fault zone. Of course earthquakes happen every day, but to see so many earthquake swarms happen in such diverse places within such a compressed period of time is definitely unusual. And what makes this even more unusual is the fact that Rosh Hashanah just ended. In fact, the earthquake swarm that we just witnessed in Texas started on Rosh Hashanah with a magnitude 4.0 quake near the town of "Snyder"...
In just over 12 hours, Texas experienced not one earthquake, but four, experts say.

Three quakes were centered near the town of Snyder — just south of the Texas panhandle — with a fourth centered near the Fort Worth area, according to the United States Geological Survey. The first and strongest of the cluster hit just after 4:45 p.m. Monday about 12 miles north of Snyder and measured magnitude 4.0.
That was the strongest earthquake in Texas so far this year, and it was followed by a magnitude 3.8 earthquake near Snyder, a magnitude 3.2 earthquake just south of Fort Worth, and a magnitude 2.5 earthquake near Snyder.

Comment: See: Five earthquakes in less than an hour rattle southeast Missouri, part of the New Madrid Seismic Zone


Seismograph

Five earthquakes in less than an hour rattle southeast Missouri, part of the New Madrid Seismic Zone

Lilbourn, Missouri is currently hit by a swarm of earthquakes
© USGS
Lilbourn, Missouri is currently hit by a swarm of earthquakes
An area of southeast Missouri experienced five earthquakes in less than hour Monday morning, experts say.

It started with a 2.6 magnitude temblor around 11:18 a.m. near Lilbourn, a small city just north of Missouri's boot heel, according to the United States Geological Survey. A mere three minutes later, a 1.1 magnitude quake rumbled nearby.

Just before 11:30 a.m., a 2.7 magnitude quake rattled southwest of Lilbourn followed by a 1.8 magnitude quake only five minutes later, the USGS says.

It would be 23 minutes before the next quake, another magnitude 2.7, shook an area just west of Lilbourn, the USGS says.

All five quakes happened within a 40-minute window.

Comment: For more related articles on the New Madrid Seismic Zone see:


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7.2-Magnitude Earthquake Shakes Central Chile - USGS

Graph
The country is situated in a region adjacent to the fast-moving Nazca Plate, which is characterised by high tectonic activity.

A 7.2-magnitude earthquake rocked Chile on Sunday, striking at a depth of 9.8 kilometres, according to the United States Geological Survey. The tremor struck at 15:57 (UTC), 67 kilometres west of the city of Constitucion.

Seismograph

Magnitude 6.4 earthquake strikes off southern Philippines, felt in central Indonesia

Philippines earthquake
© USGS
According to the Philippine Institute of Volcanology and Seismology, the earthquake struck off Davao Occidental province in the southern Philippines at 10.02am local time on Sunday (Sept 29).
A revised 6.4-magnitude earthquake struck off Davao Occidental province in the southern Philippines on Sunday morning (Sept 29) and was felt in North Sulawesi province in central Indonesia.

The quake hit near the border of the two countries, said Mr Widyatmoko, an official in charge at the Indonesian meteorology and geophysics agency told the Xinhua news agency.

"The quake (was) centred in the Philippine territory but it is situated near the border of Indonesia and the Philippines," he said.

There was no potential for a tsunami, Indonesia's meteorology and geophysics agency said after the quake.

The agency had initially put the quake's magnitude at 6.7.

Indonesia is vulnerable to earthquakes, as it lies on a quake-impacted zone called the "Pacific Ring of Fire."

Last Thursday, Indonesia's eastern province of Ambon was hit by a 6.5-magnitude quake, leaving at least 30 people dead, 156 others wounded and massive infrastructure damage, according to the national disaster management agency.

Seismograph

At least 20 die after shallow 6.8-magnitude earthquake hits Indonesia's Maluku islands (UPDATE)

Indonesia earthquake
© NATIONAL DISASTER MANAGEMENT AUTHORITY (BNPB)
The quake struck about 37km offshore northeast of Ambon in Maluku province at 8.46 am local time, at a depth of 29km, said the US Geological Survey.
At least three people have died after a 6.8-magnitude earthquake jolted Ambon in Maluku on Thursday morning, according to the National Disaster Mitigation Agency (BNPB).

The Meteorology, Climatology and Geophysics Agency (BMKG) first reported that the quake was felt at 6:46 a.m. Jakarta time with an epicenter located about 40 kilometers northeast of Ambon at a depth of 10 km. No tsunami alert was issued.

The agency also reported that the quake was followed by a 5.6-magnitude aftershock at 7:39 a.m. Jakarta time, with an epicenter located about 18 km northeast of the provincial capital of Ambon at a depth of 10 km.

The BNPB confirmed that three people had died as a result of the earthquake. The victims have been identified as Narti Rumain, Mateis Frans and Lai Nai -- all of whom were crushed by collapsed buildings.

BNPB spokesperson Agus Wibowo added that three people had suffered injuries following the earthquake, two of whom were identified as Djamila Lasaiba and Gamar Assegaf.


Comment: Update: CBS News reports on 26th September:
A strong earthquake Thursday killed at least 20 people and damaged a bridge, a hospital and other buildings on one of Indonesia's less populated islands. Parts of a building at an Islamic university collapsed in Ambon, the capital of Maluku province. Local disaster official Albert Simaela said a teacher was killed there when parts of the building fell on her.

Simaela said a main hospital in Ambon was damaged and patients were evacuated to tents in the hospital's yard.

National Disaster Mitigation Agency spokesman Agus Wibowo said at least 19 others were killed and more than 2,000 people took refuge in various shelters.

A damaged traditional market building is pictured following an earthquake in Ambon, Maluku province, on Thursday, September 26, 2019.
© REUTERS
A damaged traditional market building is pictured following an earthquake in Ambon, Maluku province, on Thursday, September 26, 2019.
The magnitude 6.5 quake was centered 20.5 miles northeast of Ambon at a depth of 11 miles, the U.S. Geological Survey said.




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Powerful magnitude 6.1 earthquake rocks Southern Chile

QUAKE
A magnitude 6.1 earthquake has occurred in Los Lagos, Chile, about 610 miles (980 kilometers) south of the capital, Santiago, the USGS reported. Reports say that the depth of the earthquake was 80 miles (129 kilometers).

Preliminary Earthquake Report:

Magnitude 6.1

Date-Time - 26 Sep 2019 16:36:18 UTC

- 26 Sep 2019 13:36:18 near epicenter

Seismograph

Istanbul earthquake: Magnitude 5.8 quake hits Turkey

map epicentre
An earthquake measuring 5.8 magnitude shook Istanbul on Thursday, causing panic among residents, the evacuation of schools and public offices, and at least some damage to buildings.

Turkey's Disaster and Emergency Management Authority said in a statement that the quake struck in the Sea of Marmara at 13:59 pm (10:59 GMT) at 6.9 kilometres below ground.

President Recep Tayyip Erdogan said eight people were injured and had received treatment. "Apart from small damage, we have not received any reports so far that would pain our hearts," he said.