四川沐川—马边(1994-12-30)5.5级地震山地灾害类型研究

STUDY ON TYPES OF MOUNTAIN DISASTER INDUCED BY MUCHUAN AND MABIAN EARTHQUAKE (M=5. 5) ON 1994-12-30 IN SICHUAN

地震诱发的次生山地灾害类型包括:崩塌、滚石、滑坡和重力地裂缝。其规模为中、小型,但类型较多,分布密集,造成不同程度危害。按照危险性区划,震区可划分为高、中、低三种山地灾害危险度区域。各区域面积为:UD=9.4km^2;MD=25.9km^2;LD=40.0km^2。斜坡可分为梯状破坏模型:①R_c崩塌、滚石阶梯;②L_d滑坡阶梯;③G_f重力地裂缝阶梯。

The types of mountain disaster induced by earthquake include: collapse, rock roll, landslide and gravity fissure. These types are complete, distribution are crowded, and harm have been caused by the disaster in varying degress though the volume of disaster are relative small. According to three grade system, the danger degree area of mountain disaster is determined to upper danger degree area UD = 9. 4 km2, middle danger degree area MD= 25. 9 km2, and low danger degree area LD= 40. 0 km2. Slope have characteristics breaking model of the ladder-shaped in earthquake region: ①Re-ladder of rock collapse and rock roll; ②Ld-ladder of landslide; ③Gf-ladder of gravity fissure.