Analysis on the Development Situation of Geo-Hazards Based on Statistical Methods in Mainland China in Recent Years

In recent years, many geo-hazards were triggered by the frequent occurrences of sudden and regional extreme heavy rainfall, earthquake events, and human society and economic activities during urbanization, for example, the development of underground space. The authoritative data on geo-hazards that occurred in recent years in mainland China were collected. We analyzed the correlation of the conditions of triggering geo-hazards and the spatial and temporal characteristics based on the statistical data. From the findings, geo-hazards in China were controlled by numerous factors including topography, formation lithology, slope structure, fault, and geomorphic evolution. The geo-hazards depict the concentration and zonation distribution characteristics. The most occurred geo-hazards in China are landslides, collapses, and debris flow, and most are small to medium in scale. Heavy rainfall is the major triggering factor, and geo-hazards' spatial distribution strongly correlates with spatial and temporal rainfall distribution. Finally, due to ongoing mitigation efforts, the development trend of casualties and economic losses caused by geo-hazards has shown a decreasing trend.