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2019 M7.1 Ridgecrest earthquake slip distribution controlled by fault geometry inherited from Independence dike swarm

Author

Listed:
  • Johanna M. Nevitt

    (Earthquake Science Center)

  • Benjamin A. Brooks

    (Earthquake Science Center)

  • Jeanne L. Hardebeck

    (Earthquake Science Center)

  • Brad T. Aagaard

    (Geological Hazards Science Center)

Abstract

Faults often form through reactivation of pre-existing structures, developing geometries and mechanical properties specific to the system’s geologic inheritance. Competition between fault geometry and other factors (e.g., lithology) to control slip at Earth’s surface is an open question that is central to our knowledge of fault processes and seismic hazards. Here we use remote sensing data and field observations to investigate the origin of the 2019 M7.1 Ridgecrest, California, earthquake rupture geometry and test its impact on the slip distribution observed at Earth’s surface. Common geometries suggest the fault system evolved through reactivation of structures within the surrounding Independence dike swarm (IDS). Mechanical models testing a range of fault geometries and stress fields indicate that the inherited rupture geometry strongly controlled the M7.1 earthquake slip distribution. These results motivate revisiting the development of other large-magnitude earthquake ruptures (1992 M7.3 Landers, 1999 M7.1 Hector Mine) and tectonic provinces within the IDS.

Suggested Citation

  • Johanna M. Nevitt & Benjamin A. Brooks & Jeanne L. Hardebeck & Brad T. Aagaard, 2023. "2019 M7.1 Ridgecrest earthquake slip distribution controlled by fault geometry inherited from Independence dike swarm," Nature Communications, Nature, vol. 14(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36840-2
    DOI: 10.1038/s41467-023-36840-2
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    References listed on IDEAS

    as
    1. Kejie Chen & Jean-Philippe Avouac & Saif Aati & Chris Milliner & Fu Zheng & Chuang Shi, 2020. "Cascading and pulse-like ruptures during the 2019 Ridgecrest earthquakes in the Eastern California Shear Zone," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
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