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Model of the Rupture Surface of the Khuvsgul Earthquake of January 12, 2021 From InSAR Data

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Abstract—For the first time, based on the synthetic-aperture radar interferometry data (InSAR), a surface rupture model of the earthquake that occurred on January 12, 2021 beneath Lake Khuvsgul (Khubsugul, Khövsgöl), Mongolia, is built. In the constructed model, the rupture of this region-largest instrumental event strikes northwest, has a dip angle of 45°, a slip rake angle in the interval from –130° to –150°, and a mean displacement of 1 m. The rupture extends to a depth of 18 km and has a strike length of 26 km. In contrast to the surface rupture model built by the US Geological Survey from seismological data, the model based on the InSAR data shows that in the northern part of the lake, the main Khuvsgul fault strikes northwest. The obtained result requires increasing the existing estimates of the length of the seismogenic part of the Khuvsgul fault severalfold.

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Notes

  1. https://earthquake.usgs.gov/.

  2. https://www.globalcmt.org.

  3. https://earthquake.usgs.gov/earthquakes/eventpage/us6000d7ix/ finite-fault.

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ACKNOWLEDGMENTS

We thank F. Pollitz for providing the Static1D software and European Space Agency for providing the Sentinel-1 satellite images and SNAP software. We are grateful to the reviewers of our paper P.N. Shebalin, Yu.O. Kuzmin, and G.G. Kocharyan for their valuable comments.

Funding

The work was supported by the Interdisciplinary Scientific and Educational School “Fundamental and Applied Space Research” of Moscow State University. The development of methods for inverse problem solution is carried out within the framework of the State Assignment of the IPE RAS.

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123242, Moscow, Russia

    E. P. Timoshkina, V. O. Mikhailov, V. B. Smirnov, M. S. Volkova & S. A. Khairetdinov

  2. Faculty of Physics, Moscow State University, 119991, Moscow, Russia

    V. O. Mikhailov & V. B. Smirnov

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  1. E. P. Timoshkina
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  2. V. O. Mikhailov
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  3. V. B. Smirnov
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  4. M. S. Volkova
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  5. S. A. Khairetdinov
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Correspondence to V. B. Smirnov.

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Translated by M. Nazarenko

A year ago, on January 12, 2021, a strong earthquake occurred near Lake Baikal in the region of Lake Khuvsgul, Mongolia. In this issue of Izvestiya, Physics of the Solid Earth, we publish two papers devoted to this earthquake.

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Timoshkina, E.P., Mikhailov, V.O., Smirnov, V.B. et al. Model of the Rupture Surface of the Khuvsgul Earthquake of January 12, 2021 From InSAR Data. Izv., Phys. Solid Earth 58, 74–79 (2022). https://doi.org/10.1134/S1069351322010098

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