Sunday, 2 December 2018

7.0 earhquakeat Anchorage, Alaska

M7 EARTHQUAKE ANCHORAGE, ALASKA


Sam Carana, via Facebook

A massive earthquake with a magnitude of 7.0 on the Richter scale hit an area 13 km North of Anchorage, Alaska, on November 30, 2018, at 40.9 km depth. Several other earthquakes hit nearby areas that day.

A recent post discussed the danger of earthquakes triggering large methane releases from the seafloor of the Arctic Ocean. Warming caused by people makes snow and ice melt, which is taking weight off the land and dumping it into the nearby sea. This change in weight can trigger earthquakes and seismic shocks that can travel over long distances and trigger further earthquakes elsewhere. Especially vulnerable are areas near fault lines. Earthquakes in the Arctic Ocean can destabilize methane hydrates and such earthquakes as well as the eruption of methane itself can in turn destabilize methane hydrates in nearby locations
Alaska Rocked By More Than 200 Aftershocks Since Friday's Massive Quake

1 December, 2018


As if the chaos that followed Friday's magnitude 7 earthquake didn't create enough mayhem for the residents of Anchorage, Alaska, USGS reported on Saturday that in the wake of what many Alaskans described as the worst earthquake of their lifetime parts of the state have already been rocked by more than 200 aftershocks.

Two
 
And the quakes are expected to continue for "some time," according to Seismologist Randy Baldwin. As of noon ET on Saturday, the official tracker on the Alaska Earthquake Center's website stood at 224.

Alaska
 
Residents were still shaken from Friday's back-to-back magnitude 7 and magnitude 5.7 quakes, which destroyed roads and sent goods flying off of store shelves as people ran into the street for cover.
Shortly after returning, the second quake hit, and Alaskans went through the whole ritual again. Fortunately, there have been no reports of deaths or serious injuries (since the state is located above an area where two tectonic plates converge, Alaskans are accustomed to earthquakes - they experience more than the other 49 states combined).
Alaska
 
Still, Alaskans insisted that this one was different, according to several people who shared their stories with CNN.
"It was absolutely terrifying," Palmer resident Kristin Dossett said. "It shook like I have never felt anything shake before," she said.
"It was very loud when it came," Anchorage Mayor Ethan Berkowitz said. "It was very clear that this was something bigger than what we normally experience. We live in earthquake country...but this was a big one."
[...]
Philip Peterson was in a multistory building in downtown Anchorage as the structure swayed and coffee mugs fell from tables and tiles from the ceiling.
"I just jumped under my desk and had to ride it out," Peterson said.
The magnitude 7 quake could be felt up to 400 miles outside of Anchorage. One seismologist described it as the worst earthquake to hit the state since 1964. Meanwhile, operations have resumed at a trans-Alaska pipeline that was briefly closed after the quake.
"I think it's safe to say that, not measured in magnitude or location but in terms of how strong the ground itself shook during the earthquake," he said during a question-and-answer session at the University of Alaska, Fairbanks.

The Anchorage police department reported "major infrastructure damage", and helicopters and drones were still working on a damage assessment as of midday Saturday.


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