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Data Processing of Nearfield Earthquake Records in Jiashi Earthquake Region--3-D Velocity Tomograthy
Received date: 2002-02-07
Revised date: 2002-05-27
Online published: 2003-01-18
A joint inversion of 3 D velocity structure and hypocenter positions was used in Jiashi nearfield data processing. Velocity imaging over the depth of 20 km has been obtained. The results show that velocity structure over the depth of 8 km is strongly and horizontally heterogeneous. Characteristics of sedimentary cover of several kilometers in this region is revealed. Velocity imaging at 12～18 km depths shows two low velocity zones, one trending NE and the other NW. They intersect below the meizoseismal area, revealing characteristics of earthquake occurrence tectonics in this region. Obvious difference exist in crust structure along the EW and the SN direction in the meizoseismal area and on the two sides of the strong earthquake sequence zone. This is one of the deep backgrounds of strong earthquakes development.
Lai Xiaoling , Zhang Xiankang , Li Songlin . Data Processing of Nearfield Earthquake Records in Jiashi Earthquake Region--3-D Velocity Tomograthy[J]. Journal of University of Chinese Academy of Sciences, 2003 , 20(1) : 50 -55 . DOI: 10.7523/j.issn.2095-6134.2003.1.008
[1] 朱令人,苏乃秦,杨马陵.1997年新疆伽师强震群及三次成功的临震预报.中国地震,1998,14(2):101~115
[2] 周仕勇,许忠淮,陈晓非.1997年新疆伽师强震群生成机理研究,自然科学进展,2001,11(9):999~1004
[3] 赵翠萍,顾瑾平,白彤霞.新疆伽师强震群震源应力环境分析.中国地震,2001,17(3):289~298
[4] 段永红,赖晓玲,李松林,等.新疆伽师地震的近场观测和对它的初步认识.地球物理学进展,1999,14(4):28~40
[5] 刘启元,陈九辉,李顺成,等.新疆伽师强震群区三维地壳上地幔S波速度结构及其地震成因的探讨.地球物理学报,2000,43(3):356~365
[6] 周仕勇,许忠淮,陈晓非.伽师强震群震源特征及震源机制力学成因分析.地球物理学报,2001,44(5):654~662
[7] 胥颐,刘福田,刘建华,等.天山地震带的地壳结构与强震构造环境.地球物理学报,2000,43(2):184~193
[8] 赵仲和.多重模型地震定位程序及其在北京台网的应用.地震学报,1983,5(2),242~254
[9] Thurber C H. Earthquake location and three-dimension crustal structure in the Coyote Lake area, central California. J Geophys Res, 1983, 88:8226~8236
[10] Pelvis G L, Booler J R. The mixed discrete-continuous inverse problem: Application to the simultaneous determination of earthquake hypocenters and velocity structure. J Geophys Res, 1980, 85:4801~4810
[11] Um J, Thurber C H. A fast algorithm for two-point seismic ray tracing. Bull Seism Soc Am, 1987, 77(3): 972~986
[12] 胡方秋,胡军,柏美祥,等.新疆地震构造.见:马杏垣主编.中国岩石圈动力学地图集.北京:中国地图出版社,1989.56~57
[13] 王琪,丁国瑜,乔学军,等.用GPS研究南天山(伽师)地区现今地壳变形.地震学报,2000,22(3):263~270
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