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《Meteorology and Disaster Reduction Research》 2007-01
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Distribution Characteristics and Macroscopic Influencing Factors of Seismic Loess Landslides in Northwest China

YAO Qing-lin (Institute of Geology, China Earthquake Administration, Beijing 100029, China)  
The 9 seismic hazard regions in the loess plateau of China are divided. The 4th region of it, locating on west of Liupan Mountain and east of Huining, is the region of the most serious seismic landslides in the loess plateau of China. Both the largest epicentral distance and the largest area in which the loess seismic landslides can occur have something to do with seismic magnitudes. The macroscopic factors influencing sensitivity of seismic loess landslides include geological structure, seismic fault, stratum, topography, hydrological condition, seismic intensity etc. The loess slope whose gradient2° can occur seismic landslides, but the small topography in high intensity region cannot decide occurrence of seismic landslides. Higher comparability between the embedding topography and the present one, the water table high to the clay or the sand stratum, and the new loess stratum can aggravate occurrence of loess seismic landslides. The conglomerate (Q_p~1) and the old loess stratum on some location have function of skid resistance. In the loess region of Northwest China, the smallest magnitudes at which the seismic avalanche or slippage can occur individually are MS 4, 5 (about intensity 5). In the 4th seismic hazard region, the earthquakes with intensity 6~7 can obviously occur landslides, the ones with intensity 10 can occur landslides group with larger area; and the ones with MS 7.5, 8 can individually occur subsiding landslide and flowing landslide. The combination effect of multi-factors can be different with any single factor, and the former is more important than the latter.
【Fund】: 国家科技部地震科学数据库共享资助项目(编号:2002DZGX-04);; 国家软科学研究计划项目(编号:2006GXQ3B201)
【CateGory Index】: P642.22
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