陕西省地质灾害区划及活动规律统计分析

本文对陕西省主要地质灾害类型进行了综合区划，分出８个大的灾害区及５２个次一级灾害亚区。灾害规律统计分析表明：在空间上，区域性滑坡等灾害类型的群体发育受新构造应力场的制约，高频率优势事件往往是沿新构造应力网络中一组最大剪切面方向或主张应力方向出现；在时间上，灾害事件显示多层次多尺度群发期及周期序列，表现为具有２７０ａ的长周期及９～１３ａ、４～６ａ的短周期．

REGIONALIZATION AND STATISTICAL ANALYSISOF GEOLOGICAL HAZARDS IN SHAANXI

In this paper, the author proposed the principle and foundation of the regionalization for geologic hazardsbasing on the forming and composing type of the catastrophic phenomena such as the mountain avalancher,landslide , debrisflow, as well as the soil and water loss. Shaanxi procince is classified into 8 zones and 52 subordinate zones.Statisticalanalysis for temporal and spatial distribution of hazard events show that the spatial positionof landslide groups is controlled by geotectonic stress field,i.e,the predominant events distribute along the orientation of one of the maximum shear planes or the direction of the principal tensile stress. The temporal occurrenceof disaster clusters has dominant perioditied of several time scales, i. e, 270, 9-13, and 4-6 years Periods.