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 2 0 0 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。
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.
出处
《华北地震科学》
2000年第2期35-40,共6页
North China Earthquake Sciences
关键词
形变
短期地形变前兆
临震预报
地震前兆
deformation
short term crustal deformation precursor
impending earthquake prdiction.
