S波影区地震精确定位的研究

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英文篇名：The study on the precise location of the seismic event in the shadow area of S wave 中文刊名：地震地磁观测与研究 英文刊名：Seismological and Geomagnetic Observation and Research 作者：朱战斌 ; 田鑫 英文作者：Zhu Zhanbin and Tian Xin(Beijing National Earth Observatory ; Beijing 100095 ; China) 中文关键词：S波影区 ; LG2波 ; 震中距 英文关键词：S-shadow ; LG2-wave ; epicentral distance 出版日期：2007-12-25 机构：北京国家地球观象台,北京国家地球观象台 中国北京100095,北京白家疃地球科学国家野外科学观测研究站,中国北京100095,中国北京100095,北京白家疃地球科学国家野外科学观测研究站,中国北京100095 年：2007 期：06 出版单位：地震地磁观测与研究

摘要

长期的地震观测发现,北京地震台记录到的S波影区地震存在定位误差大的现象。由于来自震中距9°～36°的地震经过了低速层,造成了S波不发育。所以S波影区地震多用LG波来确定震中距。造成影区地震定位偏差大的现象有两个原因:①长期以来多是用短周期记录来区分LG1和LG2,定位偏差较大;②有的影区地震,S波也少许发育,但用S波来定位也存在定位偏差大的现象。为此搜集了北京地震台记录到的影区地震,通过NCDSN仿真成SK记录,通过理论震中距的比较,找到了准确定位影区地震的LG2识别位置。
After long-term observation of earthquake,we found that the location error of seismic event in the shadow area of S wave is large.For pass through the low velocity zone,the S wave of earthquakes with epicentral distance of 9°~36° are weak,so the LG wave are used to determine the epicentral distance of the earthquake in shadow area of S wave.There are two reasons for the location deviation of shadow earthquake.One is that we usually distinguish the LG1 and LG2 phase with short period record for a long time,while the LG phase is not right identified.The other is that although some earthquakes in shadow area develop S wave in some extent,the location with S wave is also of large deviation.We gathered the seismic records of the region of the shadow and imitate this to a record of KIRNOS using NCDSN.By comparing with the theoretical epicentral distance,we find out exact discriminating position of LG2-wave which can be used to locate epicentral distance well.

引文

宋美琴,赵向佳,张瑞芳.2003.如何快速准确地速报国内地震[J].地震地磁观测与研究,24(2):71～74
    孙立新,李惠智.1998.银川地震台地震波记录特征[J].地震地磁观测与研究,19(2):30～37