ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Solid Earth Geophysics
Volume 13 - 2025 | doi: 10.3389/feart.2025.1660221
This article is part of the Research TopicVolume II - Faults and Earthquakes Viewed by Networks, Monitoring Systems, and Numerical Modelling TechniquesView all articles
Characterizing the foreshock, main shock, and aftershock sequences of the recent major earthquakes in Southern Alaska, 2020–2024
Provisionally accepted
- 1Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russia
- 2Accademia Nazionale delle Scienze detta dei XL, Rome, Italy
- 3Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, RAS, Troitsk, Russia, Troitsk, Russia
- 4Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Russia
- 5National University of Oil and Gas «Gubkin University», Moscow, Russia
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We continue analyzing earthquake sequences in terms of their variability and scaling proper-ties, including the behavior of the control parameter η of the unified scaling law for earth-quakes (USLE), along with a detailed analysis of the surface wave records for reconstruction of the source in approximation of the second moments of the stress glut tensor to obtain integral estimation of its length, orientation, and seismic process development over time. In particular, we present the analysis of the cases of the four recent earthquakes in Southern Alaska – 22 July 2020, Mw7.8 at 105 km SSE of Perryville, 19 October 2020, Mw7.6 at 97 km SSE of Sand Point, 29 July 2021, Mw8.2 at 99 km SE of Perryville and 16 July 2023, Mw7.2 at 106 km S of Sand Point that have occurred right at the western edge of the rupture zone of the 1964 Great Alaska, M9.3 mega-earthquake and contribute to apparent activation of the region started with the three major earthquakes (24 January 2016, Mw7.1, 23January 2018, Mw7.9, and 30 November 2018, Mw7.1) at its north and southern borders.
Keywords: Earthquake sequences, Earthquake source, Pacific and North America plate boundary, Unified scaling law for earthquakes, USLE control parameter
Received: 05 Jul 2025; Accepted: 27 Aug 2025.
Copyright: © 2025 Kossobokov, Filippova, Fomochkina and Nekrasova. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Vladimir G Kossobokov, Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russia
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