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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.
Studied two types of apparent resistivity changes and their causes in the earthquake prediction.Changes in the first class belong to the precursor of the earthquake and are the apparent resistivity anomaly in the middle and short period before the earthquake.The second type of change is in the Chinese mainland or the northwest , North China and other large regions, synchronous, synchronous occurrence of apparent resistivity trend of the trend of the transition / acceleration anomaly, or in the long trend changes occur during the decline / ascending anomaly.This phenomenon of anomalous space-time cluster corresponding to mainland China, large Regional high seismicity level and the surrounding long-distance large-scale earthquake activity.Based on the characteristics of two types of changes, the change of apparent resistivity before the 2008 Wenchuan MS8.0 earthquake in Sichuan Province is considered, and it is considered that in the middle stage before the earthquake, The four stations on the margin of the Songpan-Garzê active massif record prominent apparent resistivity anomalies. However, the precursory information in the short-term pre-earthquake phase is weak with no temporary seismic information and can not be applied to short-term forecasts.