simeonof_20200722

Map showing the distribution of aftershocks in the two weeks following the magnitude-7.8 main event, as well as the rupture patches of historical earthquakes in the surrounding area. A magnitude-6.1 occurred 4 minutes after, and just west of, the main shock. The number of aftershocks increased daily. Another magnitude-6.1 in the western Shumagin Islands took place on July 28. (See https://earthquake.alaska.edu/earthquakes for an up-to-date, interactive map of earthquakes in the region.) One question scientists will address is whether the aftershocks map out a continuous rupture across the Shumagin Gap. Credit: Alaska Earthquake Center

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