2009年青海大柴旦6.4级地震序列的双差法重新定位研究

详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文

英文篇名：RELOCATION OF DACHAIDAN Ms6.4 EARTHQUAKE SEQUENCE IN QINGHAI PROVINCE IN 2009 USING THE DOUBLE DIFFERENCE LOCATION METHOD 中文刊名：高原地震 英文刊名：Plateau Earthquake Research 作者：刘文邦 ; 王培玲 ; 马玉虎 ; 陈玉华 英文作者：LIU Wenbang ; WANG Peiling ; MAYuhu ; CHEN Yuhua(Earthquake Administration of Qinghai Province ; Xining 810001 ; China) 中文关键词：大柴旦6.4级地震 ; 余震序列 ; 双差定位方法 ; 青海 英文关键词：Dachaidan Ms6.4 earthquake ; Earthquake sequence ; The double difference location method ; Qinghai 出版日期：2011-03-15 机构：青海省地震局; 年：2011 期：01 出版单位：高原地震

摘要

采用双差地震定位算法对2009年青海大柴旦6.4级地震和3个及以上台站记录到的余震进行了重新定位,获得了873次地震的重新定位结果。主震的震中位置为37.56°N,95.90°E,震源深度6.5 km,发震在大柴旦宗务隆山断裂带。精确定位结果与原始数据进行比较,定位残差明显减小,定位后的地震分布更加集中,主要分布在大柴旦宗务隆山断裂带周围,震源深度优势分布在2～11 km,与主震震中位置和震源深度相符。
In the paper,the double-difference earthquake location method is used to relocate Dachaidan Ms6.4 earthquake in 2009 and all the aftershocks that recorded by three or more stations.873 earthquake relocation results are obtained.Main shock epicenter is roughly at 37.56° N,95.90° E at Dachaidan-Zongwulong fault,the depth of the source is about 6.5 km.Comparing the precise positioning results and the original data,it is found that the location residuals significantly reduced,and the distribution of the relocated earthquakes become more concentrated,mainly located around Dachaidan-Zongwulong fault zone,advantage of the focal depth distribution in the 2~11 km,this is consistent with the epicenter location and focal depth of the main shock.

引文

[1]郑钰,杨建思.双差算法的剖析及参数对定位的影响[J].地震地磁观测与研究,2008,29(3):85-93.
    [2]曾融生,朱介寿,周兵,等.青藏高原及其东部邻区的三维地震波速度结构与大陆碰撞模型[J].地震学报,1992,11(S1):523-533.
    [3]苏伟,彭艳菊,郑月军,等.青藏高原及邻区地壳上地幔S波速度结构[J].地球学报,2002,23(3):193-200.
    [4]胥颐,刘福田,刘建华,等.中国大陆西北造山带及毗邻盆地的地震层析成像[J].中国科学:D辑,2000,30(2):113-123.