Abstract
The 2021 Maduo earthquake occurred in the interior of the Bayan Har block of the Tibetan Plateau. We used space-born radar interferometry to study the coseismic deformation of this earthquake. Sentinel-1 InSAR observations along ascending and descending orbits provide the coseismic deformation. Pixel offset tracking method is used to complement InSAR observations near the rupture zone. The surface trace of the ruptured fault can be clearly mapped by InSAR observations. We constructed a three-dimensional coseismic slip model constrained by interferograms and pixel offset tracking in the form of a geodetic inverse problem. The coseismic slip model demonstrates that: (1) the Maduo earthquake was a left-lateral strike-slip event with moment magnitude of 7.4; (2) the peak slip is approximately 8 m and is located at a depth of 4 km; (3) a ‘shallow slip deficit’ of the Maduo earthquake is observed; (4) the ruptured faults are found to be dipping northward with a high dipping angle (80 degrees). This study has important implications on earthquake hazard evaluation of the Bayan Har block.
Highlights
On 21 May 2021 (UTC) a M7.3 earthquake stroke Maduo county, Qinghai province, China
From the information provided by U.S Geological Survey, the Maduo earthquake occurred on a left-lateral strike-slip fault in the Bayan Har block of the Tibetan Plateau
We attempted to change the smoothness constraint in the inversion and observe the variations in the coseismic slip model
Summary
On 21 May 2021 (UTC) a M7.3 earthquake stroke Maduo county, Qinghai province, China. From the information provided by U.S Geological Survey, the Maduo earthquake occurred on a left-lateral strike-slip fault in the Bayan Har block of the Tibetan Plateau. The Maduo earthquake occurred inside the Bayan Har block, which is a major tectonic block of the eastern Tibetan Plateau [2]. The Bayan Har block moves eastward relative to the fixed south China block [3]. At the northern boundary of the Bayan Har block lies the Kunlun fault [4,5,6,7] and at the southern boundary lies the Xianshuihe fault [8,9,10,11]
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