ABSTRACT
National early warning project for geo-hazards has been carried on three years since 2003, every province also starts similar event gradually. Geo-hazard forecasting object is mainly regional or drainage paroxysmal geo-hazards such as rockfall, landslide and soil-rock debris flow. According to statistic analysis of historic geo-hazards and 15-days rainfall before hazard, geo-hazard forecasting criterion mode chart based on weather factor to be established, and critical rainfall criterion chart in typical regions geo-hazards is preliminary gotten. Geo-hazard inducing by sustained rainfall Sustained rainfall induces cluster geo-hazards in Guangdong and Fujian province, at June 18-23, 2005. The relationship of geo-hazards and rainfall accumulative days is controlled by rainfall process, that is, is relative with rainfall and rainfall intensity. In view of regional or drainage geo-hazards such as rockfall, landslide, soil-rock debris flow, induced by the coupling action among some terrific natural conditions such as rainfall, freeze thawing, and earthquake.
