Error Quantities Analysis on Double-Difference Earthquake Location Algorithm
详细信息
- 责任者：Zhao Yunfeng (Second Crust Monitoring and Application Center ; CEA ; Xi’an 710054 ; China) ; Wang Weidong
- 刊名：Journal of Seismological Research
- 出版年：2013
- 卷期：36(2)
- 关键词：地震 ; earthquakes ; 震源 ; focus
- 页码：p.178-184
- 图表：illus., 3 tables, 11 refs.
- 分类号：0500
- issnNo：ISSN1000-0666
- isbnNo：CN53-1062/P
摘要
Based on the double-layer crust model,we constructed some earthquakes in lower crust to constitute the event cluster,and added different decibels noise to the real hypocenter location as initial hypocenter location in double-difference relocation when the stations are in uniform distribution and on one side of the clusters respectively,and then analyzed the influence of initial hypocenter location and stations distribution on the double-difference relocation results. The result indicates that in the situation of the stations are in uniform distribution,when initial epicenter location deviates less than 22. 3 km from real epicenter,the double-difference relocated epicenter of earthquakes averagely deviates less than 3. 1 km from real epicenter,and relative epicenter distance between the earthquakes is 2.9 km which approaches the real value of 3.35 km. The relocated depth distribution is more concentrated than that of real events. The relocated relative epicenter location between the earthquakes which is not sensitive to the different decibels noise is more stable obtained by double-difference location. The relocated results with stations are in uniform distribution or all on one side of the cluster are almost same,w hich shows that the stations distribution has little influence on the double-difference location. The analysis on the search radius MAXSEP shows that relocated focal location of some events may not be reliable when average distance betw een the focal pairs in the events cluster is slightly larger than MAXSEP.