Major 2020 Alaska quake triggered neighboring 2021 temblor

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Major 2020 Alaska quake triggered neighboring 2021 temblor uafairbanks ScienceAdvances

in a paper jointly led by University of Alaska Fairbanks Geophysical Institute associate professor Ronni Grapenthin and Michigan State University assistant professor Julie Elliott. UAF postdoctoral researcher Revathy M. Parameswaran is among the four co-authors.

The first of the two major quakes, known as the Simeonof event, occurred July 21, 2020. It registered at magnitude 7.8, struck near the Shumagin Islands south of the Alaska Peninsula and ruptured westward. "This could be a case study to understand how adjacent earthquake patches could be activated by a significant release of energy that has accumulated through plate motion," Parameswaran said.

The work also indicated some notable areas of"very high" stress loading of the fault, especially in the shallower regions of the model fault plane. That area didn't rupture during this earthquake, according to the research paper.

 

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