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Ground motions caused by seismic waves propagating to the near surface due to the rupture of an uncertain seismic source also have uncertainty. In this paper, the uncertainties of asperity intensity and rupture velocity are represented by random variables, and three rupture scenarios are set up to consider the uncertainties of asperity location and initial rupture location. The spatial distribution of ground motion parameters in the valley near a dip-slip fault with uncertainty is investigated. The influences of the fault distance and the dip angle on the uncertainty of the ground motion parameters in the valley are analyzed. The multiplicative dimensional reduction method is used to improve the computational efficiency of the uncertainty quantification problem, and the physical process from fault rupture to site response is simulated based on the boundary element method. The results reveal that the uncertainty of seismic source leads to the uncertainty of ground motions. The scattering of seismic waves by the valley leads to the non-uniform amplification of the uncertainty. The coefficient of variation (COV) of the peak acceleration of the vertical ground motion at the center of the valley can reach 0.27. There are violent fluctuations in the spatial distribution of the COVs of the peak velocities of the vertical ground motions of the mountains. The variability of the ground motion at the valley decreases with the increase of the fault distance, and it tends to stabilize when the fault distance is greater than 4 km. The variability decreases with the increase of the fault dip angle, and the maximum variability of the peak ground acceleration can be up to 4 times the COV of the asperity intensity.
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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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