The seismogenic tectonic of Anchorage Mw7.0 Earthquake in Alaska, November, 30, 2018

Abstract

The Mw7.0 Anchorage earthquake is most significant event since 1964 Mw9.2. Far away subduction zone trace, thus the seismogenic structure and failure plane are not clear and keep disputed. Based on published data, including faults, aftershock, focal mechanism solutions and source fault model and so on, we make comprehensive analysis and discussion. We think that this earthquake belongs to plate subduction event, without relationship with Castle Mountain fault and Border Ranges fault for seismogenic structure, only earthquake-controlling structure. Both faults are not responsible for the Anchorage earthquake. The actual seismogenic fault plane has a south-to-north trending and dips to east, which is corresponding to the nodal plane I.

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Acknowledgements

We wish to thank Yueqiang Qiao for insightful and helpful reviews. Financial support for this research was provided in part by Scientific Research Fund of Institute of Seismology and Institute of Crustal Dynamics, China Earthquake Administration (Grant No. IS 2018126278). The figures were partially drawn by Generic Mapping Tools (GMT) (Wessel and Smith (1995)).

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Correspondence to Dongning Lei.

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Lei, D., Yang, G. The seismogenic tectonic of Anchorage Mw7.0 Earthquake in Alaska, November, 30, 2018. Acta Geophys. 68, 619–626 (2020). https://doi.org/10.1007/s11600-020-00436-x

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Keywords

  • Seismogenic structure pattern
  • Anchorage Mw7.0 earthquake
  • Coulomb stress change
  • Aftershocks
  • Active fault systems