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Outline
Based on seismic waveform data, earthquake catalogs, and historical focal mechanism solution data, we systematically analyze the stress evolution characteristics of the seismic source area of the 2021 Yangbi, Yunnan MS6.4 earthquake from the perspective of three types of stress parameters, namely apparent stress, b-value, and tectonic stress field. The results indicate that: 1) The apparent stress continuously increased before the main shock and decreased significantly after the shock, reflecting the physical process of pre-seismic stress accumulation and co-seismic stress release. 2) The b-value decreased obviously prior to the main shock, indicating a sustained enhancement of regional tectonic stress. 3) Results from the stress field inversion show that the main shock induced perturbations in the stress field of seismic source region, though these were not significant. Comprehensive analysis demonstrates that the variations in apparent stress and b-value effectively reveal the dynamic stress evolution characteristics of the seismic source area during the gestation and occurrence of the Yangbi earthquake sequence, which provides important insights for understanding the mechanisms of fault activity and stress evolution.
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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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