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

• Published in: Izvestiya. Physics of the solid earth 2022-02, Vol.58 (1), p.74-79
• Main Authors: Timoshkina, E. P., Mikhailov, V. O., Smirnov, V. B., Volkova, M. S., Khairetdinov, S. A.
• Format: Article
• Language: English
• Subjects: Earth and Environmental Science; Earth Sciences; Earthquakes; Geological surveys; Geophysics/Geodesy; Interferometric synthetic aperture radar; Interferometry; Lakes; Modelling; Radar; Radar data; Rake angle; Rupturing; Seismic activity; Seismological data; Seismology; Strikes; Surveying; Synthetic aperture radar; Synthetic aperture radar interferometry
• ISSN: 1069-3513; 1555-6506
• DOI: 10.1134/S1069351322010098

—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.