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Abstract <p>This work is focused on the study of a series of the strong earthquakes that occurred within and in the nearest vicinity of the Shumagin seismic gap (southwest Alaska) in 2020−2021, based on satellite geodetic data. We constructed models of fault zones of three earthquakes: July 22, 2020 (<i>M</i><sub><i>W</i></sub> = 7.8), October 19, 2020 (<i>M</i><sub><i>W</i></sub> = 7.6), and July 29, 2021 (<i>M</i><sub><i>W</i></sub> = 8.2). The spatial and energy relationships of the fault zones of the occurred earthquakes and the preseismic interplate coupling within the gap were studied. It was shown that only the part of the seismogenic potential accumulated within the Shumagin gap since the beginning of the 20th century was released during the 2020−2021events.</p>

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Series of Strong Earthquakes in the Southwest Alaska in 2020–2021: Has the Shumagin Gap Closed?

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • I. S. Vladimirova,
  • Yu. V. Gabsatarov

摘要

Abstract

This work is focused on the study of a series of the strong earthquakes that occurred within and in the nearest vicinity of the Shumagin seismic gap (southwest Alaska) in 2020−2021, based on satellite geodetic data. We constructed models of fault zones of three earthquakes: July 22, 2020 (MW = 7.8), October 19, 2020 (MW = 7.6), and July 29, 2021 (MW = 8.2). The spatial and energy relationships of the fault zones of the occurred earthquakes and the preseismic interplate coupling within the gap were studied. It was shown that only the part of the seismogenic potential accumulated within the Shumagin gap since the beginning of the 20th century was released during the 2020−2021events.