线性单事件地震定位方法的改进及应用尝试  

Improvement and case test of linear method for single event seismic location

作　　者：金明培[1] 汪荣江 戴仕贵[3] 

机构地区：[1]中国地震局滇西地震预报实验场,中国云南大理671000 [2]德国地球科学研究中心,德国波茨坦14473 [3]四川省地震局,中国成都610041

出　　处：《地震学报》2014年第5期757-769,980,共13页Acta Seismologica Sinica

基　　金：国家留学基金委;中国地震局"地震科技骨干人才培养计划"(20105007)项目联合资助

摘　　要：根据大震速报和快速预警实际需要,首先对Inglada线性单事件定位方法进行了适当的改进,使其在仅有P波到时数据的情况下也能快速定位,且求解过程仅需简单迭代而不用奇异值分解;其次,尝试将改进后的方法从单层均匀模型引入到分层均匀模型中的近源台网定位情形,并通过单层均匀和分层均匀两种不同模型的理论实验讨论了该方法的可行性和适用范围;最后整合了质量高且分布较好的距离2008年汶川MS8.0地震震中最近的强震、微震,以及川西流动台阵等观测记录资料,对汶川MS8.0主震初始破裂点的时空参数进行了多种模型的定位实验.结果表明,改进后的线性单事件定位方法简单、快捷、易用,可广泛应用于近源地震定位,尤其是用于无法得到S波到时的中强以上直至巨大地震的速报、地震现场流动台网的快速定位以及地震的快速预警等.Under the necessity of earthquake rapid reporting and early warning systems,we improve the Inglada linear method for single event seismic loca-tion.After this improvement,locating easily uses a simple iteration and mean algorithm instead of a complex singular value decomposition,and only four arri-val times of P wave are essential.We also try to theoretically test this method from homogeneous velocity model to layered homogenous velocity model,so as to expand the application scope of the method.Combining with the 31 high-quality arrival times of direct P waves recorded at the near-field stations in Si-chuan strong motion network,Sichuan regional seismic network,western Si-chuan mobile array and Zipingpu reservoir seismic network,we practically relo-cate the main shock of Wenchuan MS8.0 earthquake,and report the new param-eters for this earthquake based on different velocity models.Theoretical tests show that this improved linear method is a simple,rapid and practical procedure for local earthquake location using a single-layer homogeneous crust model.It could be used for large earthquake rapid report,mobile seismic network fast lo-cation,and earthquake early warning for local earthquakes.

关 键 词：线性单事件定位法 改进 应用测试 汶川MS8.0地震 

分 类 号：P315.31[天文地球—地震学]