1997年伽师震群中相邻正断层和走滑断层之间相互应力作用
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摘要
自1997年1月21日开始,在将近4个月的时间内,位于塔里木盆地西北边缘的新疆伽师地区发生了7次Ms≥6.0的大地震.前人地震精定位结果显示这些地震发生在两条相邻的破裂带上.根据前人震源机制解和精定位结果,计算了这7个大地震间库仑应力作用,还分析了伽师震群附近的1996年阿图什地震对伽师地震群的影响.计算结果显示第4个地震震源附近的库仑应力受之前地震影响增加了0.5bar左右,而在第2,3,5和6个地震震源附近的库仑应力均增加了约0.8bar.研究表明通过改变邻区断层上库仑破裂应力状态,1997伽师震群中各地震之间存在明显的应力触发作用.而更重要的是伽师地区的正断层活动促进了雁形走滑断层间发生地震的循环触发.
引文
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2Tapponnier P,Molnar P.Active faulting and tectonics in China.J Geophys Res,1977,82:2905—2930
3Avouac J,Tapponnier P,Bai M,et al.Active thrusting and folding along the northern Tienshan,and Late Cenozoic rotation of the Tarim relative to Dzhungaria and Kazakhstan.J Geophys Res,1993,98:6755—6840
4Avouac J,Tapponnier P.Kinematic model of active deformation in central Asia.Geophys Res Lett,1993,20:895—898
5张培震,邓起东,杨晓平,等.天山的晚新生代构造变形及其地球动力学问题.中国地震,1996,12(2):127—140
6中国地震局专题组.伽师强震群区及帕米尔东北侧地震构造环境的研究.北京:中国地震局地质研究所,2000
7Zhou S Y,Xu Z H,Han J,et al.Analysis on the master event method and precise location of1997Jiashi strong earthquake swarm in western China.Acta Seismol Sin,1999,12(3):285—291
8刘启元,陈九辉,李顺成,等.新疆伽师强震群区三维上地壳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—367
9周仕勇,姜明明,Robinson R.1997年新疆伽师强震群发震过程中发震断层间相互作用的影响.地球物理学报,2006,49(4):1102—1109
10赖院根,刘启元,陈九辉,等.新疆伽师强震群区横波分裂与应力场特征.地球物理学报,2002,45(1):83—93
11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
12单新建,何玉梅,朱燕,等.伽师强震群震源破裂特征的初步分析.地球物理学报,2002,45(3):416—425
13郭飙,刘启元,陈九辉,等.新疆伽师强震区余震序列的地震台阵定位.地震地质,2002,24(2):199—208
14邓起东,张培震,冉勇康,等.中国活动构造基本特征.中国科学D辑:地球科学,2002,32(12):1020—1030
15Burtman V S,Skobelev S F,Molnar P.Late Cenozoic slip on the Talas-Ferghana fault,the Tien Shan,central Asia.Geol Soc Am Bull,1996,108(8):1004—1021
16Abdrakmatov K Y,Aldazhanov A,Hager B H,et al.Relatively recent construction of the Tien Shan inferred from GPS measurements of present day crustal deformation rates.Nature,1996,384:450—453
17胥颐,Steven W R,魏若平,等.天山中部的地震定位和地壳活动性分析.地球物理学报,2005,48(6):1308—1315
18Zhou S Y,Xu Z H.Fracture characteristics of the1997Jiashi,Xinjiang,China,earthquake swarm inferred from source spectra.Acta Seismol Sin,2000,13(2):125—135
19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
20何玉梅,郑天愉,单新建.1996年3月19日新疆阿图什6.9级地震:单侧破裂过程.地球物理学报,2001,44(4):510—519
21King G C P,Stein R S,Lin J.Static stress changes and the triggering of earthquakes.Bull Seismol Soc Am,1994,84:935—953
22Toda S,Stein R S.Response of the San Andreas fault to the1983Coalinga-Nunez Earthquake:an application of interaction-based probabilities for Parkfield.J Geophys Res,2002,107,doi:10.1029/2001JB000172
23Harris R A.Introduction to special section:Stress triggers,stress shadows,and implications for seismic hazard.J Geophys Res,1998,103:24347—24358
24Dziak R P,Fox C G,Embley R W.Relationship between the seismicity and geologic structure of the Blanco transform fault zone.Mar Geophys Res,1991,13:203—208
25Mann P,Hempton M R,Bradley D C,et al.Development of pull-apart basins.J Geol,1983,91:529—554
26Ruppel C.Extensional processes in continental lithosphere.J Geophys Res,1995,100:24187—24215
27Gregg P M,Lin J,Smith D K.Segmentation of transform systems on the East Pacific Rise:implications for earthquake processes at fast-slipping oceanic transform faults.Geology,2006,34:289—292,doi:10.1130/G22212.1
2Tapponnier P,Molnar P.Active faulting and tectonics in China.J Geophys Res,1977,82:2905—2930
3Avouac J,Tapponnier P,Bai M,et al.Active thrusting and folding along the northern Tienshan,and Late Cenozoic rotation of the Tarim relative to Dzhungaria and Kazakhstan.J Geophys Res,1993,98:6755—6840
4Avouac J,Tapponnier P.Kinematic model of active deformation in central Asia.Geophys Res Lett,1993,20:895—898
5张培震,邓起东,杨晓平,等.天山的晚新生代构造变形及其地球动力学问题.中国地震,1996,12(2):127—140
6中国地震局专题组.伽师强震群区及帕米尔东北侧地震构造环境的研究.北京:中国地震局地质研究所,2000
7Zhou S Y,Xu Z H,Han J,et al.Analysis on the master event method and precise location of1997Jiashi strong earthquake swarm in western China.Acta Seismol Sin,1999,12(3):285—291
8刘启元,陈九辉,李顺成,等.新疆伽师强震群区三维上地壳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—367
9周仕勇,姜明明,Robinson R.1997年新疆伽师强震群发震过程中发震断层间相互作用的影响.地球物理学报,2006,49(4):1102—1109
10赖院根,刘启元,陈九辉,等.新疆伽师强震群区横波分裂与应力场特征.地球物理学报,2002,45(1):83—93
11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
12单新建,何玉梅,朱燕,等.伽师强震群震源破裂特征的初步分析.地球物理学报,2002,45(3):416—425
13郭飙,刘启元,陈九辉,等.新疆伽师强震区余震序列的地震台阵定位.地震地质,2002,24(2):199—208
14邓起东,张培震,冉勇康,等.中国活动构造基本特征.中国科学D辑:地球科学,2002,32(12):1020—1030
15Burtman V S,Skobelev S F,Molnar P.Late Cenozoic slip on the Talas-Ferghana fault,the Tien Shan,central Asia.Geol Soc Am Bull,1996,108(8):1004—1021
16Abdrakmatov K Y,Aldazhanov A,Hager B H,et al.Relatively recent construction of the Tien Shan inferred from GPS measurements of present day crustal deformation rates.Nature,1996,384:450—453
17胥颐,Steven W R,魏若平,等.天山中部的地震定位和地壳活动性分析.地球物理学报,2005,48(6):1308—1315
18Zhou S Y,Xu Z H.Fracture characteristics of the1997Jiashi,Xinjiang,China,earthquake swarm inferred from source spectra.Acta Seismol Sin,2000,13(2):125—135
19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
20何玉梅,郑天愉,单新建.1996年3月19日新疆阿图什6.9级地震:单侧破裂过程.地球物理学报,2001,44(4):510—519
21King G C P,Stein R S,Lin J.Static stress changes and the triggering of earthquakes.Bull Seismol Soc Am,1994,84:935—953
22Toda S,Stein R S.Response of the San Andreas fault to the1983Coalinga-Nunez Earthquake:an application of interaction-based probabilities for Parkfield.J Geophys Res,2002,107,doi:10.1029/2001JB000172
23Harris R A.Introduction to special section:Stress triggers,stress shadows,and implications for seismic hazard.J Geophys Res,1998,103:24347—24358
24Dziak R P,Fox C G,Embley R W.Relationship between the seismicity and geologic structure of the Blanco transform fault zone.Mar Geophys Res,1991,13:203—208
25Mann P,Hempton M R,Bradley D C,et al.Development of pull-apart basins.J Geol,1983,91:529—554
26Ruppel C.Extensional processes in continental lithosphere.J Geophys Res,1995,100:24187—24215
27Gregg P M,Lin J,Smith D K.Segmentation of transform systems on the East Pacific Rise:implications for earthquake processes at fast-slipping oceanic transform faults.Geology,2006,34:289—292,doi:10.1130/G22212.1
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