浅谈地震对地质灾害的影响——以“5.12”汶川特大地震后四川省地震灾区地质灾害情况为例

A Brief Talk on Influence of Earthquake on Geohazards

地震作用在地震灾区对地质灾害的发育起到了引发、促进作用,其引发的地灾类型主要有崩塌、滑坡、泥石流、潜在不稳定斜坡、地面塌陷、地裂缝等,尤以崩塌、潜在不稳定斜坡、地裂缝等增加比例较大。地震引发的地质灾害具有数量多,规模大、危害大的特点,并主要沿主中央断裂带分布。地震导致斜坡的稳定性降低,产生大量松散物质,为新地质灾害的发生起到促进作用,使地震灾区较长时间内处于地质灾害高发期,产生较大危害。因此,在地震灾区选择安置建房场址时要认真考虑地震后可能新发生的地质灾害的影响,尽量避开潜在危险地带。

Geohazards caused by earthquake are rockthll, landslide, mud-rock tlow, unstable slope, collapse, and land crack and so on which are in the central fracture zone. Earthquake results in decrease in stability of slope and frequently-occurring of geohazards. Post-disaster reconstruction in the earthquake-stricken area must keep clear of potential geohazards.