摘要
根据玉门地区区域构造环境和中强震基本活动特征,分析了2002年12月14日玉门5 9级地震前地震活动性时空异常特征和地震序列类型,结果表明,地震前存在地震空区、条带、低频度、低b值、缺震、高η值、小震调制比和GL值高值等中短期异常现象;地震序列类型为前震—主震—余震型;其发震构造为一组挤压逆冲推覆断裂。
This paper, based on regional tectonic environment and seismicity characters of moderate-strong earthquake, we studied the seismicity characters in space-time anomalies and earthquake sequence before Yumen earthquake with MS59 on Nov 14, 2002.The results show that there were many medium-short term anomalies such as earthquake band, earthquake gap, low frequency, low b-value, earthquake deficiency, high η-value, minor earthquake modulate ratio and high GL-value, etc before the earthquake. The earthquake sequence is foreshock-mainshock-aftershock. Its structure of triggered earthquakes is a group of pressure thrust faults.
出处
《华南地震》
2003年第2期31-39,共9页
South China Journal of Seismology
基金
地震科学联合基金(102063)
国家"十五"科技攻关课题(2002BA601B01-03-01)资助.
