海城盖州地区速度结构和震源位置的联合反演研究

地震 ›› 2014, Vol. 34 ›› Issue (3): 13-26.

海城盖州地区速度结构和震源位置的联合反演研究

王亮^1,3, 周龙泉², 焦明若³, 曹凤娟³, 翟丽娜³

1.中国科学技术大学地球与空间科学学院,安徽合肥230026;
2.中国地震台网中心,北京100045;
3.辽宁省地震局,辽宁沈阳110034

收稿日期:2013-11-18 修回日期:2014-02-26 出版日期:2014-07-31 发布日期:2020-09-08
作者简介:王亮(1983-),男,辽宁沈阳人,工程师,主要从事地震预报及数字地震资料应用等研究。
基金资助:
辽宁省地震局重点实验室项目(LNDZ2014003)

Simultaneous Inversion for Earthquake Hy pocenters and V elocity Structure in the Haicheng and Gaizhou Area,Liaoning Province

WANG Liang^1,3, ZHOU Long-quan², JIAO Mingruo³, CAO Fengjuan³

1. School of Earth and Space Science, University of Science and Technology of China,Hefei 230026, China;
2. China Eart hguake Networks Center, Beijing 100045,China;
3. Liaoning Seis mological Bureau, Shenyang 110034, China

Received:2013-11-18 Revised:2014-02-26 Online:2014-07-31 Published:2020-09-08

摘要/Abstract

摘要： 2012年2月至2013年4月在辽宁盖州地区连续发生了5次4级左右地震,分别为2012年2月2日M_L4.7、4.2地震、7月12日M_L4.2地震11月1日M_L4.0地震以及2013年3月30日M_L4.0级地震,地震序列大致呈NW向分布。利用2008年以来盖州地区和海城一岫岩地区的地震观测数据,采用震源位置和速度结构联合反演的软件包Simulps14,给出了两个地.区的小震精定位结果和三维速度结构。发现盖州地区震群发生位置较浅,且随时间向西北向展布;其地下速度结构与海城地区地下速度结构存在一定的相似性,分析认为盖州震群是发生在.一条类似于大洋河断裂但规模较小的新的断裂带上。

关键词: 盖州震群, 联合反演, 精定位, 速度结构

Abstract: There are several M_L4.0 earthquakes occurred in the Gaizhou area, Liaoning province from Feb.2, 2012 to Apr. 30,2013. This earthquake sequence shows a roughly NW-trending distribution. We use eart hquake observation reports recorded by regional seismic stations during the period from 2008 to 2013. Through simul taneous inversion method of ear thquake hypocenters and velocity structure, we got the eart hquake location and velocity structure of Gaizhou and Haicheng area by software Simulps14. The result of earthquake location shows that Gaizhou ear thquake warm occurred in a shallower depth, and over time, to the northwest trending. The Gaizhou's underground velocity structure is similar to Haicheng' s underground velocity structure. We think that the Gaizhou earth-quake swarm occurred in a new and smaller fault similar to the Dayanghe fault.

Key words: Simultaneous inversion, Velocity structure, The Gaizhou earthquake swarm

中图分类号:

P315.7

王亮, 周龙泉, 焦明若, 曹凤娟, 翟丽娜. 海城盖州地区速度结构和震源位置的联合反演研究[J]. 地震, 2014, 34(3): 13-26.

WANG Liang, ZHOU Long-quan, JIAO Mingruo, CAO Fengjuan. Simultaneous Inversion for Earthquake Hy pocenters and V elocity Structure in the Haicheng and Gaizhou Area,Liaoning Province[J]. EARTHQUAKE, 2014, 34(3): 13-26.

参考文献

[1] 杨智娴,Brian W Stump, 陈运泰. 1999年海城一岫岩地震序列的精准定位[J].地震学报,2011,33(3): 271-278.
[2] 马胜利,邓志辉,马文涛.雁列式断层过程中物理场演化的实验研究[J]. 地震地质,1995, 17(4):327-341.
[3] 蒋海昆,马胜利,张流.雁列式断层组合变形过程中的声发射活动特征[J].地震学报,2002,24(4): 385-396.
[4] Aki K, Lee W H K. Determination of three dimensional velocity anomalies under a seismic array u-sing P arrival times from local earthquakes. 1. A homogeneous initial model[J]. J Geophys Res,1976, 81: 4381-4399.
[5] UmJ, ThurberC H. A fast algorithm for two point seismic ray tracing[J]. Bull Seism Soc Am 1987,77: 972-986.
[6] Zhao D, Hasegawa A,Horiuchi S.Tomographic imaging of P and S wave velocity structure beneath northeastern Japen[J]. J Geophys Res, 1992, 97: 19909-19928.
[7] 李志伟,胥颐,郝天珧.环渤海地区的地震层析成像与地壳上地幔结构[J].地球物理学报,2006,49(3): 797-804.
[8] Pavlis G L.Appraising earthquake hypocenter location errors: a complete, practical approach for single-event locations[J]. Bull Seism Soc Am, 1986,76,1699-171.
[9] Geiger L.Probability method for the determination of earthquake epicenters from arrival time only[J]. Bull St Louis Univ, 1912, 8: 60-71.
[10] Zhang H, Thurber C.Double difference Tomography: the method and its application to the Hay-ward Fault, California[J]. Bull Seism Soc Am, 2003, 93: 1875-1889.
[11] ThurberC H. Earthquake locations and three dimensional crustal structure in the Coyote late area,Central California[J]. J Geophys Res, 1983, 88: 8226-8236.
[12] 刘福田,震源位置和速度结构的联合反演(I)-理论和方法[J].地球物理学报,1984, 27(2),167-175.
[13] Kisling E,Ellsworth W L, Eberhard-Phillips D, et al.Initial reference models in local earthquake tomography[J]. J Geophys Res,1994, 99: 19635-19646.
[14] Jacob K H Three dimensional seismic ray tracing in a laterally heterogeneous spherical earth[J]. JGeophys Res, 1970, 75: 6675-7789.
[15] Thurber C H, AtreS R. Three dimensional yp / vs variations along the Loma Prieta rupture zone[J].Bull Seism Soc Am,1993,83: 717-736.
[16] Humphreys and Clayton. Adaptation of tomographic reconstruction to seismic travel time problems[J]. Journal of Geophysical Research, 1988, 93: 1073-1085.
[17] 卢造勋.中朝地台东北缘地区的地震层析成像[J].地球物理学报,2002, 45(3): 338-351.