2009年青海大柴旦M_S6.4地震前中小地震震源机制前兆特征分析
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
2009年8月28日青海省大柴旦MS6.4地震发生前,在震中附近发生了30多个1.0≤ML≤3.9地震。针对这些中小地震,采用青海省区域地震台网观测资料,利用矩张量反演理论和格林函数库技术对主震及震前中小地震进行快速矩张量反演,计算出了其中15个ML≥1.5地震的震源机制解。结果表明,主震发生前中小地震震源参数的一致性较好,断层面走向、倾角的一致性达到86%,其初至P波波形相关系数也较高。中小地震应力P、T轴的优势方向与该区域应力场方向基本一致。
The MS6.4 earthquake occurred in Qinghai Dachaidan area on Aug.28 in 2009,and there occurred more than thirty 1.0≤ML≤3.9 earthquakes before the main shock around the epicenter.Using the observation data in Qinghai Regional Seismic Network,we quickly inversed the moment tensor for the main shock and the midsmall earthquakes before the main shock to calculate the focal mechanism solutions of 15 ML≥1.5 earthquakes by moment tensor inversion theory and Green function database technology.The results showthat the focal mechanism solutions of mid-small earthquakes before main shock showed the good consistency,the consistency of the strike and dip of the fault plane reached to 86%,and the correlation coefficient of the initial P wave was higher.The advantage direction of the P、T axis of stress of mid-small earthquakes was consistent with the direction of stress field in the study region.
引文
陈颙.1978.用震源机制一致性作为描述地震活动性的新参[J].地球物理学报,21(2):142-159.
    陈运泰,吴忠良,王培德,等.2000.数字地震学[M].北京:地震出版社.
    啜永清,啜永清,王赵丽,等.2000.用初动符号的变化识别前震和震群的研究[J].中国地震,16(3):242-255.
    姜枚,许志琴,钱荣毅,等.2006.从德令哈地震分析青藏高原北缘东段的深部构造活动[J].中国地质,33(2):268-272.
    柯龙生,李用普,章爱娣,等.1977.前震序列与一般小震群活动规律的探讨[J].地球物理学报,20(2):89-94.
    荣代潞,李亚荣,金铭,等.2000.利用单台数字地震记录反演天祝—古浪5.4级地震矩张量[J].高原地震,12(2):32-36.
    孙长虹,许丰,杨玉波,等.2012.2003年青海省德令哈6.7级地震序列的震源机制解及其构造含义[J].地球物理学报,55(10):3338-3346.
    王俊国,刁桂苓.2005.千岛岛弧大震前哈佛大学矩心矩张量(CMT)解一致性的预测意义[J].地震学报,27(2):178-183.
    王林瑛,陈佩燕,吴忠良,等.2005.前震特征及其识别研究[J].地震学报,27(2):171-177.
    周云好.2000.用远场体波反演震源破裂过程研究[D].北京:中国地震局地震预测研究所,20-25.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心