龙门山及邻区断裂分布及地震前后断裂形态差异
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition)(2012)
Abstract
利用欧拉方程(欧拉反褶积法)对龙门山地区重力数据进行反演,得到了地震前龙门山及邻区断裂的分布特征及参考深度.汶川地震波及范围广、破坏性大,地震前后发震断裂及周围断裂的形态必然会存在一定差异.笔者布设了一条实测重力剖面来对比地震前后断裂的形态.对比发现,地震后龙门山断裂带的逆冲趋势减弱,映秀-北川断裂与都江堰-江油断裂之间产生了多个破碎带.通过断裂形态的变化探究本次地震的成因,提出了应力面(第二地震面)和多震源的观点.
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Key words
Euler equations,Fault morphology,Gravity,Wenchuan earthquake
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