摘要
计算了１９８５年至１９９２年发生在φＮ３９°００′～φＮ ４１°００′，λＥ１１２°００′～λＥ１１４°３０′范围内的１２７次ＭＬ≥２．０地震的波速比值，分析了１９８９ 年大同—阳高６．１级地震前后源区与场区波速比的时空变化特征及其差异，对计算结果进行了ｔ检验，源区与场区波速比的时空变化及ｔ检验结果表明，大同—阳高６．１级地震前，源区波速比存在比较明显的下降—低值—恢复—高值过程。场区则表现了６．１级地震前的高值异常，６．１ 级地震后源区和场区的波速比计算结果一致，时空变化均为正常。
The Vp/Vs ratios of the M L≥2.0 earthquakes in range of φ N39°00′～φ N41°00′and λ E112°00′～λ E114°30′ from 1985 to 1992 are counted. Time space variation characteristics and difference of Vp/Vs ratios in source and field of the Datong Yanggao Earthquake of 1989 are analyzed. Result has been tested with t method. The time space variation characteristics and test result indicates that Vp/Vs ratio in source appeared obvious falling recovery maximum course before this earthquake, the Vp/Vs ratios in field appeared high anomaly before this earthquake, the Vp/Vs ratios in epicenter and field appeared consistency after this earthquake, and time space variation appeared normality.
出处
《山西地震》
1999年第3期10-14,共5页
Earthquake Research in Shanxi
