中国东北及周边地区地壳横波衰减的成像研究
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摘要
利用146个台站记录的中国地震年报及黑龙江、吉林、辽宁和内蒙古四省地震台网观测报告的6371个近震46652条横波振幅与周期资料,采用二维层析成像方法反演东北地区地壳介质品质因子Q0空间分布图像.在绝大部分研究区都可达到2°×2°的分辨率.结果表明,东北及周边地区地壳介质品质因子Q0平均值为323,其Q0值分布及其所揭示的衰减变化特征与研究区的地表构造具有明显的相关性,如华北平原、松辽盆地和海拉尔平原等沉积层较厚的区域通常呈现为低Q0值;而燕山、太行、兴蒙褶皱带等沉积层薄或基岩出露的区域则呈现为相对高的Q0值.整个东北地区呈现高低衰减带相间分布.
In this paper we have selected 46652 ML amplitude readings from 6371 events recorded by 146 stations as reported in the Annual Bulletin of Chinese Earthquakes(ABCE) and regional seismic network of Heilongjiang province,Jilin province,Liaoning province and Inner Mongolia province.A two-dimensional tomography method is adopted to find regional variation of crustal attenuation in Northeast China and its adjacent regions.We obtained an average Q0 value of 323 for the entire studied region with regional fluctuations ±200.In most of the study area a resolution of 2 degrees is attained.Regions with the highest attenuation(low Q0 values) are beneath Bohai Basin,and Songliao Plain and Hailaer Basin also have low Q0 values,as these areas have thick sediments and strong tectonic activity.The entire Northeast region shows a distribution pattern of alternating high and low attenuation.
In this paper we have selected 46652 ML amplitude readings from 6371 events recorded by 146 stations as reported in the Annual Bulletin of Chinese Earthquakes(ABCE) and regional seismic network of Heilongjiang province,Jilin province,Liaoning province and Inner Mongolia province.A two-dimensional tomography method is adopted to find regional variation of crustal attenuation in Northeast China and its adjacent regions.We obtained an average Q0 value of 323 for the entire studied region with regional fluctuations ±200.In most of the study area a resolution of 2 degrees is attained.Regions with the highest attenuation(low Q0 values) are beneath Bohai Basin,and Songliao Plain and Hailaer Basin also have low Q0 values,as these areas have thick sediments and strong tectonic activity.The entire Northeast region shows a distribution pattern of alternating high and low attenuation.
引文
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[2]Hearn T,Beghoul N,Barazangi M,et al.Tomography ofthe western United States from regional arrival times.J.Geophys.Res.,1991,96(B10):16369-16381.
[3]Hearn T M,Wang S Y,Pei S P,et al.Seismic amplitudetomography for crustal attenuation beneath China.Geophys.J.Int.,2008,174(1):223-234.
[4]汪素云,裴顺平,许忠淮等.利用ML振幅研究地壳横波Q0值I:不同构造区的衰减特征.地球物理学报,2007,50(6):1740-1747.Wang S Y,Pei S P,Xu Z H,et al.Crustal S-wave Qestimated from MLamplitude I:attenuation in differenttectonic regions of China.Chinese J.Geophys.(in Chinese),2007,50(6):1740-1747.
[5]汪素云,裴顺平,Thomas M Hearn等.利用ML振幅研究地壳横波Q0值II:Q横向变化特征.地球物理学报,2008,51(1):133-139.Wang S Y,Pei S P,Thomas M Hearn,et al.Crustal S-waveQ estimated from MLamplitude II:Q lateral variation inChina.Chinese J.Geophys.(in Chinese),2008,51(1):133-139.
[6]马宏生,汪素云,裴顺平等.川滇及周边地区地壳横波衰减的成像研究.地球物理学报,2007,50(2):465-471.Ma H S,Wang S Y,Pei S P,et al.Q0tomography of S waveattenuation in Sichuan-Yunnan and adjacent regions.ChineseJ.Geophys.(in Chinese),2007,50(2):465-471.
[7]Pei S P,Zhao J M,Rowe C A,et al.MLamplitudetomography in North China.Bulletin of the SeismologicalSociety of America,2006,96(4):1560-1566.
[8]赵大鹏,雷建设,唐荣余.中国东北长白山火山的起源:地震层析成像证据.科学通报,2004,49(14):1439-1447.Zhao D P,Lei J S,Tang R Y.The origin of Changbaishanvolcano in Northeast China:the tomography evidence.Chinese Science Bulletin(in Chinese),2004,49(14):1439-1447.
[9]张凤鸣,张亚江,许晓艳等.日本海西部-中国东北深震区俯冲运动对东北地区浅源地震的动力的作用.东北地震研究,2007,23(1):33-39.Zhang F M,Zhang Y J,Xu X Y,et al.Dynamic action onthe subduction movement of the west part of Japan sea-deepfocus earthquake region in northeast area of China to theshallow source earthquake in northeast area.SeismologicalResearch of Northeast China(in Chinese),2007,23(1):33-39.
[10]吴福元,葛文春,孙德有等.中国东部岩石圈减薄研究中的几个问题.地学前缘,2003,10(3):51-60.Wu F Y,Ge W C,Sun D Y,et al.Discussions on thelithospheric thinning in eastern China.Earth ScienceFrontiers(in Chinese),2003,10(3):51-60.
[11]Gudmundssonó,Sambridge M.A regionalized upper mantle(RUM)seismic model.J.Geophys.Res.,1998,103(B4):7121-7136.
[12]Engebretson D C,Kelley K P,Cashman H J,et al.180Million years of subduction:GSA Today.GSA Today,1992,2(5):93-95.
[13]Lei J S,Zhao D P.P-wave tomography and origin of theChangbai intraplate volcano in Northeast Asia.Tectonophysics,2005,397(3-4):281-295.
[14]Lei J S,Zhao D P.Global P-wave tomography:On the effectof various mantle and core phases.Phys.Earth Planet.Inter.,2006,154(1):44-69.
[15]卢造勋,姜德禄,白云等.东北地区地壳上地幔结构的探测与研究.东北地震研究,2005,21(1):1-8.Lu Z X,Jiang D L,Bai Y,et al.Exploration and research onthe structure of the crust and upper mantle in NortheastChina.Seismological Research of Northeast China(inChinese),2005,21(1):1-8.
[16]卢造勋,蒋秀琴,潘科等.中朝地台东北缘地区的地震层析成像.地球物理学报,2002,45(3):338-352.Lu Z X,Jiang X Q,Pan K.Seismic tomography in theNortheast margin area of Sino-Korean platform.Chinese J.Geophys.(in Chinese),2002,45(3):338-352.
[17]Gao S,Rudnick R L,Yuan H L,et al.Recycling lowercontinental crust in the North China craton.Nature,2004,432(7019):892-897.
[18]Gao S,Rudnick R L,Carlson R W,et al.Re-Os evidence forreplacement of ancient mantle lithosphere beneath the NorthChina Craton.Earth Planet.Sci.Lett.,2002,198(3-4):307-322.
[19]Wu F Y,Walker R J,Ren X W,et al.Osmium isotopicconstraints on the age of lithospheric mantle beneathnortheastern China.Chem.Geol.,2003,196(1-4):107-129.
[20]Wang B S,Niu F L.A broad 660km discontinuity beneathNortheast China revealed by dense regional seismic networksin China.J.Geophys.Res,2010,115:B06308,doi:10.1029/2009JB006608.
[21]Ai Y S,Zheng T Y,Xu W W,et al.A complex 660kmdiscontinuity beneath northeast China.Earth Planet.Sci.Lett.,2003,212(1-2):63-71.
[22]张瑞青,李永华,姚雪绒.西北太平洋俯冲带东北地区壳幔结构研究进展.地球物理学进展,2005,21(4):1081-1085.Zhang R Q,Li Y H,Yao X R.A review of latest crustal andupper mantle discontinuities studies beneath northeast Chinain northwest Pacific subduction zone.Progress in Geophysics(in Chinese),2005,21(4):1081-1085.
[23]李光品,徐果明,高尔根等.中国东部地壳、上地幔横波品质因子的三维层析成像.地震学报,2000,22(1):73-81.Li G P,Xu G M,Gao E G,et al.QβTomography under thecrust and upper mantle in Eastern China.Acta SeismologicaSinica(in Chinese),2000,22(1):73-81.
[24]Zhao L F,Xie X B,Wang W M,et al.Seismic Lg-wave Qtomography in and around Northeast China.Journal ofGeophysical Research,2010,115:B08397,doi:10.1029/2009JB007157.
[25]洪学海,朱介寿,曹家敏等.中国大陆地壳上地幔S波品质因子三维层析成像.地球物理学报,2003,46(5):642-651.Hong X H,Zhu J S,Cao J M,et al.Tomography of the 3-DS-wave quality factor of the crust and upper mantle in China.Chinese J.Geophys.(in Chinese),2003,46(5):642-651.
[26]Phillips W S,Hartse H E,Tutledge J T.Amplitude ratiotomography for regional phase Q.Geophys.Res.Lett,2005,32:L21301,doi:10.1029/2005GL023870.
[27]Rapine R R,Ni J F,Hearn T M.Regional wave propagationin China and its surrounding regions.Bull.Seismo.Soc.Am.,1997,87(6):1622-1636.
[28]http:∥igppweb.ucsd.edu/～gabi/crust2.html
[29]胡圣标,何丽娟,汪集旸.中国大陆地区大地热流数据汇编(第三版).地球物理学报,2001,44(5):611-626.Hu S B,He L J,Wang J Y.Compilation of heat flow data inthe China continental area(3rd edition).Chinese J.Geophys.(in Chinese),2001,44(5):611-626.
[30]汪素云,Hearn T M,许忠淮等.中国大陆上地幔顶部Pn速度结构.中国科学(D辑),2001,31(6):449-454.Wang S Y,Hearn T M,Xu Z H,et al.Velocity structure ofuppermost mantle beneath China continent from Pn tomography.Science in China(Series D)(in Chinese),2001,31(6):449-454.
[31]Hearn T M,Ni J F.Pn velocities beneath continentalcollision zones:the Turkish-Iranian Plateau.Geophys.J.Int,1994,117(2):273-283.
[32]汪素云,许忠淮,裴顺平.中国大陆Pn波速度结构与强震孕育的深部背景.地球物理学报,2003,46(6):779-786.Wang S Y,Xu Z H,Pei S P.Pn velocity variation beneathChina mainland and deep struc-ture background for majorearthquake generation.Chinese J.Geophys.(in Chinese),2003,46(6):779-786.
[33]Hearn T M,Wang S Y,Ni J,et al.Uppermost mantlevelocities beneath China and surrounding regions.Journal ofGeophysical Research,2004,109:B11301,doi:10.1029/2003JB002874.
[34]Pei S P,Zhao J M,Sun Y S,et al.Upper mantle seismicvelocities and anisotropy in China determined through Pn andSn tomography.Journal of Geophysical Research,2007,112:B05312,doi:10.1029/2006JB004409.
[35]Fan G W,Thorne Lay.Strong Lg Attenuation in the TibetanPlateau.Bulletin of the Seismological Society of America,2003,93(5):2264-2272.
[36]Owens T J,Zangt G.Implications of crustal propertyvariations for models of Tibetan plateau evolution.Nature,1997,387(6628):37-43.
[37]McNamara D E,Walter W R,Owens T J,et al.Uppermantle velocity structure beneath the Tibetan Plateau fromPn travel time tomography.J.Geophys.Res.,1997,102(B1):493-505.
[38]詹艳,赵国泽,王继军等.黑龙江五大连池火山群地壳电性结构.岩石学报,2006,22(6):1494-1502.Zhan Y,Zhao G Z,Wang J J,et al.Crustal electricconductivity structure for Wudalianchi volcanic cluster in theHeilongjiang province,China.Acta Petrologica Sinica(inChinese),2006,22(6):1494-1502.
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