![]() ![]() ![]() Location of the Chickaloon earthquake, along with other earthquakes in the region recorded by the USGS for the past month. Even the direction of stretching was the same for both. Both the 2018 Anchorage and the 2021 Chickaloon mechanisms indicate that the top of the subducting plate is being stretched as it is pulled into the mantle. “There is no relation to the Anchorage earthquake except that the mechanism is similar.”Īn earthquake’s focal mechanism is a 3D representation of how the fault slipped during the event. The next question was whether the Chickaloon quake could have been triggered by the Anchorage quake, but “too much time has passed to consider this a triggered quake,” says Natalia Ruppert, senior scientist with the Alaska Earthquake Center. from Anchorage, Alaska, USA, CC BY 2.0, via Wikimedia CommonsĪt first thought to possibly be an aftershock of the November 2018 magnitude-7.1 Anchorage earthquake-triggered by descent of oceanic crust beneath North America-the Chickaloon event was quickly determined to be too far away to be called an aftershock. On May 30, a magnitude-6.1 earthquake struck near Matanuska Glacier, shown here from the Glenn Highway. Shaking reports were submitted from 560 miles (900 km) away and dozens of aftershocks have followed. near the tiny town of Chickaloon, about 75 miles (120 km) northeast of Anchorage, were triggered by a magnitude-6.1 earthquake that struck 27 miles (44 km) deep. The seismic waves, which began close to 11 p.m. On the night of May 30, from the Pacific coast all the way to the Yukon Flats, Alaskans settling to sleep under the Midnight Sun felt the ground sway. On May 30, a magnitude-6.1 earthquake struck northeast of Anchorage, Alaska, on a subducting microplate.īy Elisabeth Nadin, Ph.D., University of Alaska FairbanksĬitation: Nadin, A., 2021, Southeast Alaska quake stands alone, Temblor, ![]()
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