中文摘要：

考虑区域分析时,历史数据不完备的情况,对怀柔地区降雨诱发地质灾害发生时间概率中的降雨量阈值和降雨量阈值达到的时间概率等进行了半定量分级和应用。相关方法可为类似情况下地质灾害危险性评价提供参考,危险性评价结果可以为北京市怀柔区地质灾害防灾减灾提供借鉴。

英文摘要：

Considering the case that historical data is not complete in regional area study,authors proposed and applied a semi-quantitative approach to quantify rainfall threshold and possibility of rainfall reaching the threshold in Huairou district. The approach and conclusions could provide a reference for geo-hazard assessment,and slos provide practical reference for the Disaster Prevention and Mitigation in Huairou district of Beijing.