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Outline
Based on Sentinel-1A ascending and descending SAR data, the co-seismic InSAR deformation field and range-direction pixel offset of the January 7, 2025, MW7.1 Dingri earthquake were obtained. Combined with elastic half-space dislocation theory, the particle swarm optimization (PSO) algorithm and the Akaike-Bayesian information criterion (ABIC) were used to invert single- and double-fault slip distribution models. Static Coulomb stress changes at depths of 5 km, 10 km, and 15 km were also calculated. The results show that although the double-fault model, constrained by surface rupture traces identified via the pixel offset tracking (POT) method, exhibits higher roughness, it more accurately reproduces the surface rupture trajectory at fault strike variations. The double-fault model achieved fitting accuracies of 97.2% and 96.5% for ascending and descending InSAR data, respectively, outperforming the single-fault model (96.8%/95.9%). The inverted seismogenic fault has a strike of 186° and a dip angle of 55°, with co-seismic slip mainly concentrated in the northern section and a secondary slip core between the two fault strands. The total seismic moment released was 6.12×1019 Nm (MW7.1). Coulomb stress perturbations generally decreased on both sides of the fault, while stress increased at a depth of 15 km in the southern segment, showing strong spatial correlation with aftershock distribution, indicating that stress in this region is prone to release through aftershocks. Local stress increases were also observed at different depths near the northern and southern ends of the fault, which should be key areas for future research.
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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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