形变有震短临异常的演化特征
DEVELOPING CHARACTER OF CRUSTAL DEFORMATION IMMINENT ANOMALIES BEFORE SOME EARTHQUAKES
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摘要: 分析了7个形变有震异常的震例,通过分析归纳出了形变有震短临异常的五个基本形态特征:(1)异常初期快速突变;(2)异常在发震前一般都恢复,在突变期间一般不发震;(3)发震时间一般在异常出现恢复一个月以内;(4)震级与异常幅度之间无明显数量关系;(5)异常范围一般为200 km左右。在特征分析的基础上,进一步探讨了形变短临前兆异常上述特征的物理机制。Abstract: Seven crustal deformation anomalies before some earthquakes are analyzed in this paper.Through analysis five basic shape characters are summed up,which are: (1)suddenly change in the early stage; (2)anomalies usually recover before the occurrence of an earthquake and the quake usually does not occur during the sudden change period; (3)the quake occurrence time is usually at about one month after the anomalies recovered; (4)magnitude of the earthquake has no obvious corresponding with the extent of the anomalies quantitatively; (5)the effective radius of the anomaly is about 200 kilometers.Based on the analysis,we further discussed the physical mechanism for the shape characters of the anomalies.
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[1] 1 马宗晋,等.渐进式地震预报及其三个理论问题的讨论.地震科学研究, 1981, (1).
2 陈绍绪,等.地震前兆异常的信度综合.地震, 1998, (4).
3 张跃刚,等.张北6.2级地震前河北北部的地壳形变异常.华北地震科学, 1998, (3). -

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