A Model of Seismic Rupture Surface of the Chignik Earthquake (Alaska, USA) July 29, 2021 Based on Satellite Radar Interferometry and GNSS

Konvisar, A.; Mikhailov, V.; Volkova, M.; Smirnov, V.

Авторы: Konvisar AM, Mikhailov VO, Volkova MS, Smirnov VB
Журнал: Journal of Volcanology and Seismology
Номер: 5
Год издания: 2023
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: 418
Последняя страница: 427
Оригинальные версии: МОДЕЛЬ ПОВЕРХНОСТИ СЕЙСМИЧЕСКОГО РАЗРЫВА ЗЕМЛЕТРЯСЕНИЯ “ЧИГНИК” (АЛЯСКА, США) 29.07.2021 ПО ДАННЫМ СПУТНИКОВОЙ РАДАРНОЙ ИНТЕРФЕРОМЕТРИИ И ГНСС
DOI: 10.1134/S0742046323700276
Аннотация: This paper presents a new model of seismic rupture surface for the Chignik Mw 8.2 earthquakewhich occurred off the Alaska Peninsula on July 29, 2021. The model is based on data on surface displacementsobtained by satellite radar interferometry from Sentinel-1A and 1B images and on horizontal GPS displacementsin the area of this earthquake. We used satellite radar images for the period between July 17 andAugust 10, 2021, as well as GPS data for the period between July 18 and August 8, 2021. All of these displacementsinclude both coseismic movements and some postseismic displacements. The rupture surface modelwas developed using F. Pollitz’ solution to the problem concerning the displacement field at the surface of aspherical radially stratified planet due to a rectangular rupture inside the planet. The inversion was regularizedby requiring that the direction of displacement at each element of the rupture plane be close to a specifieddirection as given by seismological data. The seismic rupture surface in this model is fitted by a plane extendingfor 225 km along strike and 126 km along dip, and which is subdivided into 48 identical elements. Accordingto the model derived here, the type of displacement is a nearly pure thrust, with the displacement in generalinvolving all of the rupture zone. The maximum slip was 5.7 m, with the mean slip as averaged over theentire rupture plane being 2.2 m. Assuming the shear modulus to be 32 GPa, we found the seismic momentbased on the parameters of the plane we have derived and on the displacements on it as 1.95 × 10^21 N m (Мw =8.13), which is near the USGS and GCMT estimates based on seismological data.
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A Model of Seismic Rupture Surface of the Chignik Earthquake (Alaska, USA) July 29, 2021 Based on Satellite Radar Interferometry and GNSSстатья

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