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Abstract: Using ascending and descending SAR images from Sentinel-1A satellite, the co-seismic deformation of the MW5.7 earthquake in Zaduo county, Yushu city on March 7, 2024, was obtained. The geometry parameters and slip distribution of the seismogenic fault were inverted. Finally, based on the Coulomb stress changes induced by the earthquake, the impact on surrounding faults was analyzed and the regional seismic hazard was assessed. The results show that the main deformation areas of the co-seismic deformation fields from both ascending and descending orbits exhibit a four-quadrant distribution, with maximum LOS displacements of approximately 3.1 cm and 3.6 cm for ascending and descending orbits, respectively. Fault inversion experiments indicate that both the northeast-dipping fault model and the northwest-dipping fault model can reasonably explain the surface deformation caused by this earthquake. However, after a comprehensive analysis of co-seismic fitting residuals, regional active fault distribution, and geomorphic features, this study leans towards the conclusion that the seismogenic fault of this earthquake is a northeast-dipping strike-slip fault with a northwest-southeast trend. Co-seismic slip is concentrated at depths of 1.5 to 6.0 km, reaching a peak slip of 1.0 m at a depth of 3.7 km. Additionally, the static Coulomb stress changes reveal that the 2024 Zaduo earthquake has increased the risk of future earthquakes in the Yanshiping fault zone.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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