2008年汶川Ms8.0地震前后地电阻率时空变化

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采用归一化速率变化方法对2008年汶川Ms8.0地震震中周边19个定点台站观测到的地电阻率的时空变化过程进行了计算分析.时序分析结果显示:在汶川地震前,震中周边多个地电阻率台站准同步地出现了中短期前兆异常;空间分布过程显示,地震孕震过程中地电阻率在震中区域有负异常丛集和由远及近的迁移现象,负异常丛集呈象限分布,长轴方向与震源机制解主压力方向基本吻合,且受孕震断裂、台站位置、观测装置布设方向等的影响.
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