汶川地震烈度分布与震源过程相关性的初步研究

Preliminary Study on Correlation between Seismic Intensity and Earthquake Source Process in Wenchuan Earthquake of Sichuan, China

汶川地震造成了靠近发震断层附近地区的工程结构的严重破坏,由此导致了巨大的人员伤亡和财产损失。汶川地震后,虽然目前还没有得到完整的强震记录,但是作为震害宏观描述的地震烈度,在一定程度上反应了汶川地震近断层地震动与震源过程之间的相关性,如近断层地震动的方向性效应和上盘效应。本文对此做了一些定性的分析,认为高烈度区的分布与震源机制和破裂过程存在一定的相关性,并且在近断层地区很可能存在着较为显著的方向性效应和上盘效应。更详细的研究还需要在得到足够的强震记录后才能进行。

The Ms8.0 huge Wenchuan earthquake in Sichuan caused heavy casualties and serious economic losses because of engineering structures damage in high earthquake intensity regions. At present, the strong ground motion records are still in processing and can not be used in studies. However, earthquake intensity isoseismal, especially in near source region, as a macroscopic description of distribution of strong ground motion, shows the relativity with earthquake source process in some extent. In this paper, some qualitative analyses are carried out to study the characteristics of rupture process, such as rupture direetivity and hanging wall effect. The further studies are needed after the strong ground motions are available.