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Abstract:
A series of strike-slip faults developed in China, such as the Xianshuihe Fault, Honghe Fault, etc. Moderate intraplate strike-slip earthquakes are more active and hazardous in China. A series of moderate intraplate strike-slip earthquakes occurred around Tibet Plateau in 2022, including the Menyuan Mw6.6 earthquake, the Luding Mw6.6 earthquake, and the Maerkang Mw5.8 earthquake. An Mw6.6 earthquake struck Menyuan, northeast of Tibet Plateau in China, on 7th January 2022. The earthquake destroyed the high-speed railway near the epicenter. An Mw6.6 earthquake struck Luding, southeast of Tibet Plateau in China, on 5th September 2022, which caused severe damage.The bend, step-over, and other local tectonic structures play a key role in the beginning and ending of strike-slip earthquakes. The geodetic and regional seismic data make it possible to investigate the rupture process of earthquakes of moderate magnitude. The updated China Earthquake Network included over two thousand broadband stations, three thousand strong motion stations, and ten thousand MEMS sensors.The rupture processes of the two earthquakes are investigated based on regional, teleseismic, and geodetic data. Combined with the relocated aftershocks distribution by other researchers, the results show that the rupture started at the bend of the strike-slip fault and was stopped by the local tectonic structures. It implies that it would be possible for us to estimate the earthquake potential rupture zone based on the tectonic structures in the strike-slip fault zone.
