江西上地壳三维速度结构地震层析成像
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摘要
江西地处长江中下游,横跨扬子地块和华南造山带,多次强烈的区域地质活动使其成为我国多金属、稀有金属的矿产基地之一,江西区域地质具有重要研究意义.地震层析成像是认识深部和区域构造的一种重要的手段.搜集了区域地质构造资料,建立了江西地区上地壳速度结构初始模型.筛选了江西地震台网监测的江西及邻区的634次地震事件,利用阻尼最小二乘法,对江西地区上地壳三维速度结构进行了成像,发现:广丰-萍乡断裂中部区域为全江西最低速度;九江至修水一带造山带具有低速特征,且呈条状;赣州至寻乌一带,也有大范围低速特征;高速区主要处于鄱阳湖至南昌盆地区域.
Jiangxi Province locates in the middle and lower reaches of the Changjiang River,across the Yangzi Block and the South China orogenetic belt.Several strong and complex regional geological activity make it became one great base of metal and the rare metal mineral,so understanding the deep geological structure and regional tectonic of Jiangxi Province is important.Seismic tomography is an important method of understanding of the deep regional tectonic.The paper collected information on regional geological structures,established initial velocity structure model of Jiangxi province.We Gathered 634 earthquakes events monitored by Jiangxi seismological network in Jiangxi province and used the damped least square method,we got the imaging on the three dimensional velocity structure of the crust of Jiangxi region.We found that the central region of Guangfeng-Pingxiang fracture has minimum speed in Jiangxi; Jiujiang-Xiushui orogenic belt has low-speed characteristics,and takes the form of article;Ganzhou-Xunwu area also has a wide range of low-speed characteristics;highspeed area is in Poyang Lake basin and Nan Chang area.
Jiangxi Province locates in the middle and lower reaches of the Changjiang River,across the Yangzi Block and the South China orogenetic belt.Several strong and complex regional geological activity make it became one great base of metal and the rare metal mineral,so understanding the deep geological structure and regional tectonic of Jiangxi Province is important.Seismic tomography is an important method of understanding of the deep regional tectonic.The paper collected information on regional geological structures,established initial velocity structure model of Jiangxi province.We Gathered 634 earthquakes events monitored by Jiangxi seismological network in Jiangxi province and used the damped least square method,we got the imaging on the three dimensional velocity structure of the crust of Jiangxi region.We found that the central region of Guangfeng-Pingxiang fracture has minimum speed in Jiangxi; Jiujiang-Xiushui orogenic belt has low-speed characteristics,and takes the form of article;Ganzhou-Xunwu area also has a wide range of low-speed characteristics;highspeed area is in Poyang Lake basin and Nan Chang area.
引文
Aki K,Christoffersson A,Husebye E S.1976.Three-dimensional\sseismic structure of the lithosphere under Montana LASA[J].Bull Seismol Soc Am,66(2):501-524.
Aki K,Lee H K.1976.Determination of three-dimensional velocity\sanomalies under a seismic array using first P arrival times from\slocal earthquake:1.A homogeneous initial model[J].Geophys\sRes,81(23):4381-4399.
Backus G E,Gilbert J F.1967.Numerical application of a formalism\sfor geophysical inverse problems[J].Geophys JR Astr Soc,13(1-3):247-276.
Backus GE,Gilbert J F.1968.The resolving power of gross earth\sdata[J].Geophys J Roy Astron Soc,16(1):169-205.
Backus G E,Gilbert J F.1970.Uniqueness in the inversion of\sinaccurate gross earth data,Phil.Trans[J].Roy Soc London\sSer A,266:123-192.
Bian Y J,Liu B C,Liao Q L.1992.Characteristics of seismic\svelocity structure of the crust and upper mantle and Moho\sdiscontinuity in Gulei-Shicheng area[J].SOUTH CHINAJOURNAL OF SEISMOLOGY,12(3):1-10.
Chen L H,Song Z H.1990.Crust-upper mantle P wave velocity\sstructure beneath northern China[J].ACTA CEOPHYSICASINICA,35(5):540-546.
Dines K A,Lytle R J.1979.Computerized geophysical tomography[J].Proc IEEE,67(7):1065-1073.
Duan Y H,Zhang X K,Fang S M.2002.Three-dimensional finitedifference tomography of velocity structure of the upper crustal\sin north China[J].CHINESE JOURNAL OF GEOPHYSICS,20(3):362-369.
Guo B,Liu Q Y,Chen J H,et al.2009.Teleseismic P-wave\stomography of the crust and upper mantle in Longmenshan\sarea,west Sichuan[J].CHINESE JOURNAL OFGEOPHYSICS,52(2):346-355.
Jin A S,Liu F T,Sun Y Z.1980.Three-dimensional P velocity\sstructure of the crust and upper mantle under Beijing region[J].ACTA CEOPHYSICA SINICA,23(2):172-182.
Koch M.1985.A numerical study on the determination of the 3-Dstructure of the lithosphere by linear and non-linear inversion of\steleseismic travel times[J].Geophys J R Astr Soc,80:73-93.
Lu Z X,Jiang X Q,Pan K,et al.2002.Seismic tomography in the\snortheast margin rea of sino-kerean platform[J].CHINESEJOURNAL OF GEOPHYSICS,45(3):338-352.
Peng Z Z,Zhao A P,Hu G E,Wu M.2002.Research on the\srelationship based on GIS between the distribution of the active\sfaults and the seismicity in Jiangxi[J].SOUTH CHINAJOURNAL OF SEISMOLOGY,22(4):9-18.
Wei W,Sun R M,Shi Y L.2010.P-wave tomographic images\sbeneath southeastern Tibet:Investigating the mechanism of the2008 Wenchuan earthquake[J].Sci China Earth Sci,40(7):831-839.
Xu P F,Liu F T,Wang Q C,Cong B L.2000.Seismic tomography\sbeneath the Dabie-Sulu collision orogen—3Dvelocity structures\sof lithosphere[J].ACTA GEOPHYSICA SINICA,43(3):377-385.
Zhang F X,Wu Q J,Li Y H.2014.A traveltime tomography study\sby teleseismic S wave data in the Northeast China area[J].CHINESE JOURNL OF GEOPHYSICS,57(1):88-101.
Zhang H J,Clifford H T.2003.Double-difference tomography:the\smethod and its application to the Hayward fault,California[J].Bull Seism Soc Amer,93(5):1875-1889.
Zheng X,Zhao C P,Zhou L Q,et al.2012.Rayleigh wave\stomography from ambient noise incentral and eastern Chinese\smainland[J].CHINESE JOURNL OF GEOPHYSICS,55(6):1919-1928.
Zhu L P,Zeng R S,Liu F T.1990.Three-dimensional P-wave\svelocity structure under the Beijing network area[J].ACTAGEOPHYSICA SINICA,33(3):267-277.
边银菊,刘宝诚,廖其林.1992.古雷-石城地区地壳与上地幔地震波速度结构及莫霍面特征[J].华南地震,12(3):1-10.
陈立华,宋仲和.1990.华北地区地壳上地幔P波速度结构[J].地球物理学报,35(5):540-546.
段永红,张先康,方盛明.2002.华北地区上部地壳结构的三维有限差分层析成像[J].地球物理学报,20(3):362-369.
郭飚,刘启元,陈九辉,等.2009.川西龙门山及邻区地壳上地幔远震P波层析成像[J].地球物理学报,52(2):346-355.
金安蜀,刘福田,孙永智.1980.北京地区地壳和上地幔三维P波速度结构[J].地球物理学报,23(2):172-182.
卢造勋,蒋秀琴,潘科.2002.中朝地台东北缘地区的地震层析成像[J].地球物理学报,45(3):338-352.
彭自正,赵爱平,胡翠娥,吴敏.2002.基于GIS的江西活动断裂分布与地震活动关系研究[J].华南地震,22(4):9-18.
韦伟,孙若昧,石耀霖.2010.青藏高原东南缘地震层析成像及汶川地震成因探讨[J].中国科学:地球科学,40(7):831-839.
徐佩芬,刘福田,王清晨,等.2000.大别—苏鲁碰撞造山带的地震层析成像研究—岩石圈三维速度结构[J].地球物理学报,43(3):377-385.
张风雪,吴庆举,李永华.2014.中国东北地区远震S波走时层析成像研究[J].地球物理学报,57(1):88-101.
郑现,赵翠萍,周连庆,郑斯华.2012.中国大陆中东部地区基于背景噪声的瑞利波层析成像[J].地球物理学报,55(6):1919-1928.
朱露培,曾融生,刘福田.1990.京津唐张地区地壳上地幔三维P波速度结构[J].地球物理学报,33(3):267-277.
Aki K,Lee H K.1976.Determination of three-dimensional velocity\sanomalies under a seismic array using first P arrival times from\slocal earthquake:1.A homogeneous initial model[J].Geophys\sRes,81(23):4381-4399.
Backus G E,Gilbert J F.1967.Numerical application of a formalism\sfor geophysical inverse problems[J].Geophys JR Astr Soc,13(1-3):247-276.
Backus GE,Gilbert J F.1968.The resolving power of gross earth\sdata[J].Geophys J Roy Astron Soc,16(1):169-205.
Backus G E,Gilbert J F.1970.Uniqueness in the inversion of\sinaccurate gross earth data,Phil.Trans[J].Roy Soc London\sSer A,266:123-192.
Bian Y J,Liu B C,Liao Q L.1992.Characteristics of seismic\svelocity structure of the crust and upper mantle and Moho\sdiscontinuity in Gulei-Shicheng area[J].SOUTH CHINAJOURNAL OF SEISMOLOGY,12(3):1-10.
Chen L H,Song Z H.1990.Crust-upper mantle P wave velocity\sstructure beneath northern China[J].ACTA CEOPHYSICASINICA,35(5):540-546.
Dines K A,Lytle R J.1979.Computerized geophysical tomography[J].Proc IEEE,67(7):1065-1073.
Duan Y H,Zhang X K,Fang S M.2002.Three-dimensional finitedifference tomography of velocity structure of the upper crustal\sin north China[J].CHINESE JOURNAL OF GEOPHYSICS,20(3):362-369.
Guo B,Liu Q Y,Chen J H,et al.2009.Teleseismic P-wave\stomography of the crust and upper mantle in Longmenshan\sarea,west Sichuan[J].CHINESE JOURNAL OFGEOPHYSICS,52(2):346-355.
Jin A S,Liu F T,Sun Y Z.1980.Three-dimensional P velocity\sstructure of the crust and upper mantle under Beijing region[J].ACTA CEOPHYSICA SINICA,23(2):172-182.
Koch M.1985.A numerical study on the determination of the 3-Dstructure of the lithosphere by linear and non-linear inversion of\steleseismic travel times[J].Geophys J R Astr Soc,80:73-93.
Lu Z X,Jiang X Q,Pan K,et al.2002.Seismic tomography in the\snortheast margin rea of sino-kerean platform[J].CHINESEJOURNAL OF GEOPHYSICS,45(3):338-352.
Peng Z Z,Zhao A P,Hu G E,Wu M.2002.Research on the\srelationship based on GIS between the distribution of the active\sfaults and the seismicity in Jiangxi[J].SOUTH CHINAJOURNAL OF SEISMOLOGY,22(4):9-18.
Wei W,Sun R M,Shi Y L.2010.P-wave tomographic images\sbeneath southeastern Tibet:Investigating the mechanism of the2008 Wenchuan earthquake[J].Sci China Earth Sci,40(7):831-839.
Xu P F,Liu F T,Wang Q C,Cong B L.2000.Seismic tomography\sbeneath the Dabie-Sulu collision orogen—3Dvelocity structures\sof lithosphere[J].ACTA GEOPHYSICA SINICA,43(3):377-385.
Zhang F X,Wu Q J,Li Y H.2014.A traveltime tomography study\sby teleseismic S wave data in the Northeast China area[J].CHINESE JOURNL OF GEOPHYSICS,57(1):88-101.
Zhang H J,Clifford H T.2003.Double-difference tomography:the\smethod and its application to the Hayward fault,California[J].Bull Seism Soc Amer,93(5):1875-1889.
Zheng X,Zhao C P,Zhou L Q,et al.2012.Rayleigh wave\stomography from ambient noise incentral and eastern Chinese\smainland[J].CHINESE JOURNL OF GEOPHYSICS,55(6):1919-1928.
Zhu L P,Zeng R S,Liu F T.1990.Three-dimensional P-wave\svelocity structure under the Beijing network area[J].ACTAGEOPHYSICA SINICA,33(3):267-277.
边银菊,刘宝诚,廖其林.1992.古雷-石城地区地壳与上地幔地震波速度结构及莫霍面特征[J].华南地震,12(3):1-10.
陈立华,宋仲和.1990.华北地区地壳上地幔P波速度结构[J].地球物理学报,35(5):540-546.
段永红,张先康,方盛明.2002.华北地区上部地壳结构的三维有限差分层析成像[J].地球物理学报,20(3):362-369.
郭飚,刘启元,陈九辉,等.2009.川西龙门山及邻区地壳上地幔远震P波层析成像[J].地球物理学报,52(2):346-355.
金安蜀,刘福田,孙永智.1980.北京地区地壳和上地幔三维P波速度结构[J].地球物理学报,23(2):172-182.
卢造勋,蒋秀琴,潘科.2002.中朝地台东北缘地区的地震层析成像[J].地球物理学报,45(3):338-352.
彭自正,赵爱平,胡翠娥,吴敏.2002.基于GIS的江西活动断裂分布与地震活动关系研究[J].华南地震,22(4):9-18.
韦伟,孙若昧,石耀霖.2010.青藏高原东南缘地震层析成像及汶川地震成因探讨[J].中国科学:地球科学,40(7):831-839.
徐佩芬,刘福田,王清晨,等.2000.大别—苏鲁碰撞造山带的地震层析成像研究—岩石圈三维速度结构[J].地球物理学报,43(3):377-385.
张风雪,吴庆举,李永华.2014.中国东北地区远震S波走时层析成像研究[J].地球物理学报,57(1):88-101.
郑现,赵翠萍,周连庆,郑斯华.2012.中国大陆中东部地区基于背景噪声的瑞利波层析成像[J].地球物理学报,55(6):1919-1928.
朱露培,曾融生,刘福田.1990.京津唐张地区地壳上地幔三维P波速度结构[J].地球物理学报,33(3):267-277.