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在地震预报中的两类视电阻率变化

, PP. 1321-1330

Keywords: 强地震,视电阻率,两类变化,时空丛集,汶川地震

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Abstract:

?研究了地震预报中的两类视电阻率变化及其产生原因.第Ⅰ类变化属于地震前兆现象,是震前中期、短临阶段的视电阻率异常;第Ⅱ类变化是在中国大陆或西北、华北等大区域,同步、似同步发生的视电阻率长趋势变化的转折/加速异常,或在长趋势变化过程中发生的下降/上升异常.此类异常的时空丛集现象对应中国大陆、大区域的高地震活动水平及其周边远距离的大震活动.基于两类变化的表现特征,研究了2008年四川汶川MS8.0大震前的视电阻率变化,认为在震前中期阶段,位于松潘-甘孜活动地块边缘的4个台记录了突出的视电阻率异常,但震前短期阶段的前兆信息弱、无临震信息,不能实施短临预报.

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