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.
"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.
"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.