近场地震权重定位方法研究

英文篇名：Study on the seismic weighted location at near-field
中文刊名：中国地震
英文刊名：Earthquake Research in China
作者：李学政 ; 王敏超 ; 雷军
英文作者：Li Xuezheng1) Wang Minchao1) Lei Jun2) 1) Northwest Institute of Nuclear Technology ; Xi'an 710024 ; China 2) Beijing University ; Beijing 100871 ; China
中文关键词：近场地震 ; 台网布局 ; 权重 ; 地震定位
英文关键词：Earthquake at near-field Layout of seismic network Weight seismic location
出版日期：2012-09-15
机构：西北核技术研究所;北京大学地球与空间科学学院;
年：2012
期：03
出版单位：中国地震

摘要

通过轴对称映射,计算震中距定位权重,建立了权重定位方法。该方法充分考虑了台网中震中距长短不同的台站对定位贡献差异,计算的事件位置精度明显提高。该方法对台站或观测点的数量没有限制,对台网布局并不过于苛刻。特别是台网布局不合理时,盖革二乘与虚波速度法往往无法给出可靠的定位数据,而权重定位方法能够给出较好的结果。
Epicenter distance-weighing is calculated through the use of axis-symmetry image,and a location method of weighting-azimuth is established.This method takes into full account different contributions of various epicenter distances to seismic locations.Precision calculated by the weighted method is distinctly improved compared with other methods.This method does not have a limit on station numbers,and the requirement for the layout of the seismologic observation network is low.In the case of the unreasonable layout of seismic network when Geiger method and virtual wave method of velocity fail to provide reliable data,weighting-azimuth method can give better location results.

引文

傅淑芳、刘宝诚、李文艺,1982,地震学教程,北京:地震出版社。
    中国科学院地球物理研究所,1977,近震分析,北京:地震出版社。
    李学政、何永锋、雷军等,1999,神经网络方法在爆炸地震震中定位方面的应用,地震地质,21(1),77～82。
    李学政、王海军、雷军,2003,近场震级起算函数确定与爆炸余震震级计算,中国地震,19(2),117～124。
    赵仲和,1983,多重模型地震定位程序及其在北京台网的应用,地震学报,5(2),242～254。
    Bolt B A,1960,The revision of earthquake epicenter,focal depths,and origin times a high-speed computer,Geophys J,3,433～440.
    Geiger L,1910,Probability methods for the determination of earthquake epicerters from the arrival time only,Bull Stlouis Univ,8,60～71.
    Hamilton R M,Smith B E,Fischer F G,1972,Earthquakes caused by underground nuclear explosions on Pahute Mesa,Nevadatest site,BSSA,62(5),1319～1341.
    Li X Z,Lei J,2001,Study on the method of optional location on explosion events atnear-source site,Acta Seismologica,23(3),326～333.