云南地区水位动态图像的前兆异常特征
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摘要
利用云南地区多年的水位资料,使用水位年变化率动态图像方法进行分析,结果表明:①云南地区水位的年变化幅度似与未来地震强度有一定正比关系,特别当某年水位最大变化率上升幅度大于0.35或下降幅度大于-0.35时,次年往往会发生MS≥6强震;②水位异常对应地震有区域性特征,滇西北至滇东北地区以水位上升对应地震为主,滇西南和滇西以水位下降对应地震为主;③2000年以来云南绝大部分MS≥5地震的发震地点都位于前一年水位上升(或下降)极值区或次极值区附近水位梯度较大的地带上。
By using the analytical method of the dynamic pattern of groundwater level and using many years' groundwater level data in Yunnan area,the result show that: ① There is a certain proportional relation between annual variation amplitude of Yunnan area groundwater level and intensity of future earthquakes,especially when maximum variation proportion of groundwater level in some year up and down amplitude >0.35 or >-0.35,the second year will have MS≥6 intensity earthquakes;② Groundwater level anomalies corresponding to earthquakes show regional characteristics.The water level corresponds to earthquakes in northeast and northwest Yunnan area is mainly going up,but southwest and west Yunnan area is going down;③ Since 2000 year,most MS≥5 earthquakes in Yunnan area take place in groundwater level great gradient belt near extremum area or secondary extremum area of previous year groundwater level up and down.
引文
[1]王吉易,郑云贞,张素欣,等.用水氡最大变化率法对强震时间作中短期预报[J].华北地震科学,1999,(4):1-6.
    [2]张昭栋,王吉易,耿杰,等.由地下水位变化反演大同-阳高6.1级地震前后应力场的动态图像[J].内陆地震,1999,(2):135-142.
    [3]朱航.地下水位与应变的相关性分析[J].内陆地震,2001,(3):247-251.
    [4]耿杰,王吉易.唐山地震地下水位动态图像及其预报意义[J].地震研究,1998,(2):153-159.

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