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The MS6.8 Dingri earthquake in Xizang on January 7, 2025, caused extensive building collapses and significant casualties. To investigate the causes of seismic damage, this study analyzed the amplitude-frequency characteristics and propagation attenuation characteristics of near-field ground motions using 35 sets of strong motion records obtained from the National Intensity Rapid Reporting and Early Warning Network. Through comparative analysis with the seismic ground motion prediction model (ZYLW22 model) for southwestern China, it was found that the measured values of near-field ground motion parameters (including peak ground acceleration and response spectra) were found to be slightly lower than the model predictions, while far-field observations exhibited higher values than predicted. Spectral analysis revealed a pronounced high-frequency energy dominance in the 1.0~3.0 Hz range within high-intensity zones of the earthquake. The epicentral region of the Dingri earthquake lies in a pastoral-agricultural area, where local buildings predominantly consist of self-built low-rise stone/wood or adobe structures and simple frame residential buildings. The earthquake disaster may be attributed to the poor structural integrity of these buildings, whose natural vibration periods closely match the predominant periods of ground motions, resulting in widespread structural failures. Additionally, the near-fault ground motions of the Dingri earthquake also exhibited source rupture directivity effects.
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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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