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Ground motion simulation can provide reference for buildings seismic design in areas lacking earthquake records. High frequency attenuating factor （κ） is an important parameter in ground motion simulation，controlling the drop of Fourier spectrum shape in the high frequency interval. Luring magnitude 6.8 earthquake records within 150 km of the epicenter are selected to develop κ. Parzen window is used to smooth the cluttered Fourier amplitude spectrums （FAS）. The frequency interval in FAS with the smallest pH function is selected to fit the κ. The approach improves accuracy of identifying lowest and upper frequency，and the stability of the calculation. κ are calculated based on 20 stations of horizontal records and the distribution trend of κ is analyzed. The results show that FAS is gradually smooth with the increase of the window width，and it is significantly different from the original spectrum when the window width is larger than 1 Hz. Compared with 12 window widths，the window width of 0.4 Hz is the best. The window of 0.4 Hz width makes the curve smooth and the error of κ small. There is a significant directional difference in κ distribution. κ in EW direction increases with respect to epicenter distance，and κ in NS direction decreases with respect to PGA.
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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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