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Outline
To investigate the seismogenic structure of the 2025 Maduo MS5.5 earthquake in Qinghai province, we use the double-difference relocation method to precisely determine the hypocentral distribution of Maduo earthquake sequence, and calculate the tectonic stress field in the epicentral region. The fault plane parameters are derived using the Gauss-Newton and simulated annealing algorithms. Based on these results, we characterize the kinematic properties of seismogenic fault and compute the coseismic displacement field using an infinite half-space elastic model. The results show that the Maduo earthquake sequence is dominated by a near-horizontal SW-NE-oriented principal compressive stress axis and a NW-SE-oriented principal extensive stress axis, with R-value of 0.42. The fault plane parameters fitted by small earthquakes of Maduo earthquake sequence are strike 43.39° and dip 81.64°, suggesting that the rupture surface is a NE-striking nodal plane, which is a right-lateral strike-slip hidden fault. The coseismic displacement field reveals a maximum horizontal displacement of 12 to 13 mm and a maximum vertical displacement of 3 to 5 mm.
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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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