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A Local Anomaly of the Stress State of the Earth’s Crust before the Strong Earthquake (M = 7.1) of July 5, 2019, in the Area of Ridgecrest (Southern California)

  • GEOPHYSICS
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Abstract

The evolution of the stress–strain state of the Earth’s crust in Southern California during the preparation period (from January 1, 2019 until August 15, 2019) of the strong (M = 7.1) earthquake that occurred on July 5, 2019 in the area of the town of Ridgecrest is analyzed using a method based on a constructed geomechanical model and the parameters of current seismicity. An anomaly of the maximum values of the ultimate strength parameter of rocks and the consistent pattern of migration of this anomaly over this period of time are revealed. This pattern is also detected for another earthquake with M = 7.2 that occurred in Southern California on April 4, 2010. The nature of migration of such anomalies and their localization (within a few months) near the epicenters of such seismic events indicate processes of earthquake preparation and can serve as their precursors. This indicates the possibility of using the proposed method for monitoring areas of seismic hazard in order to predict strong earthquakes.

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Funding

This study was conducted as a part of a state assignment of the Ministry of Science and Higher Education of the Russian Federation (topic no. ON58–2019–0030, State Registration no. АААА-А19-119081390037-2), as well as within the framework of basic research topics nos.  AAAA-A17-117061950051-8 and AAAA-A17-117051110248-3.

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Authors and Affiliations

  1. AEROCOSMOS Research Institute for Aerospace Monitoring, 105064, Moscow, Russia

    V. G. Bondur, M. B. Gokhberg, I. A. Garagash & D. A. Alekseev

  2. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123995, Moscow, Russia

    M. B. Gokhberg, I. A. Garagash & D. A. Alekseev

  3. Moscow Institute of Physics and Technology (National Research University), 141701, Dolgoprudny, Moscow Region, Russia

    D. A. Alekseev

  4. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117218, Moscow, Russia

    D. A. Alekseev

Authors
  1. V. G. Bondur
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  2. M. B. Gokhberg
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  3. I. A. Garagash
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  4. D. A. Alekseev
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Corresponding author

Correspondence to V. G. Bondur.

Additional information

Translated by N. Astafiev

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Bondur, V.G., Gokhberg, M.B., Garagash, I.A. et al. A Local Anomaly of the Stress State of the Earth’s Crust before the Strong Earthquake (M = 7.1) of July 5, 2019, in the Area of Ridgecrest (Southern California). Dokl. Earth Sc. 490, 13–17 (2020). https://doi.org/10.1134/S1028334X20010018

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  • DOI: https://doi.org/10.1134/S1028334X20010018

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