用转换函数方法研究腾冲—临沧地区地壳结构
|
摘要
根据流动数字地震台网提供的三分量地震波形记录资料,应用转换函数及快速模拟退火算法对腾冲-临沧地区30个地震台站下的地壳横波速度结构进行了反演.反演结果说明,研究区壳幔边界清晰、莫霍界面附近速度跳跃明显,由此得出该区地壳厚度在40km左右、并具有从南向北增厚趋势.一个普遍的现象是,在腾冲-宝山地块下地壳存在明显的低速带,低速带的厚度在10~20km间.研究结果进一步表明各台站下方上地幔速度结构复杂.这些结果为探讨青藏高原东南缘下地壳的侧向黏性流动、碰撞板块边界处壳幔物质交换等均提供了重要的地球物理证据,为探讨印-藏汇聚过程中青藏高原东构造结岩石圈变形、高原隆升及其深部动力学有一定理论意义.
Based on three-component teleseismic records from portable digital seismic stations deployed in the Tengchong-Lincang region of Yunnan province,the S-wave velocity structure beneath 30 teleseismic stations are inversed by using the transform function method and SA technique. The result shows that in the region the S-wave velocities around the crust-mantle boundary and the velocity jump across the Moho discontinuity are clear,resulting in the mean thickness of the crust about 40 km with the tendency of northward increase. A common feature from the inversion result is that in the lower crust exists an obvious slow velocity zone about 10～20 km thick. Meanwhile,the velocity structure of the upper mantle below most stations is complex,suggesting that lithospheric deformation and material exchange between the crust and the upper mantle should exist near the India-Tibet collisional zone. Therefore,the presented result should provide new evidence for studying the lithospheric deformation and tectonic evolution around the Tengchong-Lincang region of the Southeastern Tibetan plateau,such as the proposed lower-crust channel flow model.
Based on three-component teleseismic records from portable digital seismic stations deployed in the Tengchong-Lincang region of Yunnan province,the S-wave velocity structure beneath 30 teleseismic stations are inversed by using the transform function method and SA technique. The result shows that in the region the S-wave velocities around the crust-mantle boundary and the velocity jump across the Moho discontinuity are clear,resulting in the mean thickness of the crust about 40 km with the tendency of northward increase. A common feature from the inversion result is that in the lower crust exists an obvious slow velocity zone about 10～20 km thick. Meanwhile,the velocity structure of the upper mantle below most stations is complex,suggesting that lithospheric deformation and material exchange between the crust and the upper mantle should exist near the India-Tibet collisional zone. Therefore,the presented result should provide new evidence for studying the lithospheric deformation and tectonic evolution around the Tengchong-Lincang region of the Southeastern Tibetan plateau,such as the proposed lower-crust channel flow model.
引文
1)刘建华.典型造山带地壳和地幔细结构研究-滇西特提斯造山带地壳和地幔细结构研究.国家自然科学基金重点项目结题验收报告(编号40034010).2006
[1]高锐.青藏高原地壳上地幔地球物理研究成果综述(上、下).中国地质,2000,4:26~28;5:20~22Gao R.Anintroduction to geophysical study of the crust and upper mantle on the Tibetan Plateau area(a,b).Geology in China(in Chinese),2000,4:26~28;5:20~22
[2]吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构.地球物理学报,1998,41(5):669~679Wu QJ,Zeng R S.The crustal structure of Qinghai-Xizang Plateau inferredfrombroadbandteleseismic waveforms.Chinese J.Geophys.(in Chinese),1998,41(5):669~679
[3]陈九辉,刘启元,李顺成等.青藏高原东北缘-鄂尔多斯地块地壳上地幔S波速度结构.地球物理学报,2005,48(2):333~342Chen J H,Liu Q Y,Li S C,et al.Crust and upper mantle S wave velocity structure across Northeastern Tibetan plateau and Ordos block.Chinese J.Geophys.(in Chinese),2005,48(2):333~342
[4]黄甫岗,姜朝松.腾冲火山研究.昆明:云南科技出版社,2000Huang F G,Jiang C S.Study of Tengchong Volcanoes.Kunming:Yunnan Science and Technology Press,2000
[5]Kan R,Hu H,Zeng R,et al.Crustal structure of Yunnan province,People’s Republic of China.Science,1986,234:433~437
[6]Wang E,Burchfiel B C.Late Cenozoic to Holocene deformation in southwestern Sichuan and adjacent Yunnan,China,and its role in formation of the southeastern part of the Tibetan Plateau.Geol.Soc.Amer.Bull.,2000,112:413~423
[7]张中杰,白志明,王椿镛等.三江地区地壳结构及动力学意义:云南遮放-宾川地震反射/折射剖面的启示.中国科学(D辑),2005,48(9):314~319Zhang ZJ,Bai Z M,Wang C Y,et al.The crustal structure under Sanjiang andits dynamic implications:Revealed byseismic reflection/refraction profiling between Zhefang and Binchuan,Yunnan.Science in China(Series D)(in Chinese),2005,48(9):1329~1336
[8]Zhao LS,Sen MK,Stoffa P,et al.Application of veryfast simulated annealingtothe determination of the crustal structure beneath Tibet.Geophys.J.Int.,1996,125:355~370
[9]周莹.接收台站精细地壳结构的波形反演[硕士论文].北京:中国科学院地球物理研究所,1999Zhou Y.Waveforminverse for fine crustal structure beneath seismic station[M.A.thesis](in Chinese).Beijing:Institute of Geophysics,Chinese Academy of Sciences,1999
[10]王卫民,姚振兴.用转换函数方法研究台湾地区三维深部结构.地球物理学报,2003,46(5):628~632Wang WM,Yao Z X.Astudy on the3D crustal structure beneath Taiwan by teleseismic transform function method.Chinese J.Geophys.(in Chinese),2003,46(5):628~632
[11]高星,王卫民,姚振兴.中国及邻近地区地壳结构.地球物理学报,2005,48(3):591~601Gao X,Wang W M,Yao Z X.Crustal structure of China mainland andits adjacent regions.Chinese J.Geophys.(in Chinese),2005,48(3):591~601
[12]朱介寿,曹家敏,蔡学林等.中国及邻近陆域海域地球内部三维结构及动力学研究.地球科学进展,2003,18(4):497~503Zhu J S,Cao J M,Cai X L,et al.Study for three-dimensional structure of earthinterior and geodynamicsin China and adjacent land andsea regions.Advance in Earth Sciences(in Chinese),2003,18(4):497~503
[13]刘启元,Kind R,李顺成.中国数字地震台网的接收函数及其非线性反演.地球物理学报,1997,40(3):356~367Liu QY,Kind R,Li S C.The receiverfunctions at the stations of the Chinese digital seismic network(CDSN)and their nonlinear inversion.Chinese J.Geophys.(in Chinese),1997,40(3):356~367
[14]王椿镛,W.D.Mooney,王溪莉,吴建平等.川滇地区地壳上地幔三维速度结构研究.地震学报,2002,24(1):1~16Wang C Y,W.D.Mooney,Wang XL,Wu J P,et al.Study on3-D velocity structure of crust and upper mantle in Sichuan-Yunnan region,China.Acta Seismologica Sinica,2002,24(1):1~16
[15]Royden L H,Burchfiel B C,King R W,et al.Surface deformation andlower crustal flowin eastern Tibet.Science,1997,276:788~790
[16]SchoenbohmL M,Burchfiel B C,Chen L,Yin J.Miocene to present activity alongthe Red River fault,China,inthe context of continental extrusion,upper-crustal rotation,and lower-crustal flow.Geol.Soc.Amer.Bull.,2006,118:672~688
[17]黄怀曾,吴功建等.岩石圈动力学研究.北京:地质出版社,1994.131Huang HZ,Wu G J,et al.Researches on Lithospheric Dynamics.Beijing:Geological Publishing House,1994.131
[18]Wittlinger G,Tapponnier P,Poupinet G,Jiang M,et al.Tomographic evidencefor localized lithospheric shear along the Altyn Tagh fault.Science,1998,282:74~76
[19]Liu J H,Liu F T,He J K,et al.Seismic tomographic research onthe Panxi paleorift:implication on crust-mantle structure and its evolution.Science in China(D),2001,44(3):277~288
[20]秦嘉政,皇甫岗,李强等.腾冲火山及其邻区速度结构的三维层析成像.地震研究,2000,23(2):157~163Qin J Z,Huang F G,Li Q,et al.3-Dtomography of velocitystructure in Tengchong Volcano areas and nearby.Journal of Seismological Research(in Chinese),2000,23(2):157~163
[21]贺传松,王椿镛,吴建平.腾冲火山区S波速度结构接收函数反演.地震学报,2004,26(1):11~18He C S,Wang C Y,Wu J P.S-wave velocity structure inferred from receiver function inversion in Tengchong Volcanic Area.Journal of Seismological Research(in Chinese),2004,26(1):11~18
[22]王椿镛,皇甫岗,万登堡等.腾冲火山区地壳结构的人工地震探测.地震研究,2000,23(2):148~156Wang C Y,Huang F G,Wan D B,et al.Deep seismic sounding of crustal structure in Tengchong Volcanic area.Journal of Seismological Research(in Chinese),2000,23(2):148~156
[23]吴建平,明跃红,王椿镛.云南数字地震台站下方的S波速度结构研究.地球物理学报,2001,44(2):228~237Wu J P,Ming YH,Wang C Y.The S wave velocitystructure beneath digital seismic stations of Yunnan province inferred fromteleseismic receiver function modeling.Chinese J.Geophys.(in Chinese),2001,44(2):228~237
[1]高锐.青藏高原地壳上地幔地球物理研究成果综述(上、下).中国地质,2000,4:26~28;5:20~22Gao R.Anintroduction to geophysical study of the crust and upper mantle on the Tibetan Plateau area(a,b).Geology in China(in Chinese),2000,4:26~28;5:20~22
[2]吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构.地球物理学报,1998,41(5):669~679Wu QJ,Zeng R S.The crustal structure of Qinghai-Xizang Plateau inferredfrombroadbandteleseismic waveforms.Chinese J.Geophys.(in Chinese),1998,41(5):669~679
[3]陈九辉,刘启元,李顺成等.青藏高原东北缘-鄂尔多斯地块地壳上地幔S波速度结构.地球物理学报,2005,48(2):333~342Chen J H,Liu Q Y,Li S C,et al.Crust and upper mantle S wave velocity structure across Northeastern Tibetan plateau and Ordos block.Chinese J.Geophys.(in Chinese),2005,48(2):333~342
[4]黄甫岗,姜朝松.腾冲火山研究.昆明:云南科技出版社,2000Huang F G,Jiang C S.Study of Tengchong Volcanoes.Kunming:Yunnan Science and Technology Press,2000
[5]Kan R,Hu H,Zeng R,et al.Crustal structure of Yunnan province,People’s Republic of China.Science,1986,234:433~437
[6]Wang E,Burchfiel B C.Late Cenozoic to Holocene deformation in southwestern Sichuan and adjacent Yunnan,China,and its role in formation of the southeastern part of the Tibetan Plateau.Geol.Soc.Amer.Bull.,2000,112:413~423
[7]张中杰,白志明,王椿镛等.三江地区地壳结构及动力学意义:云南遮放-宾川地震反射/折射剖面的启示.中国科学(D辑),2005,48(9):314~319Zhang ZJ,Bai Z M,Wang C Y,et al.The crustal structure under Sanjiang andits dynamic implications:Revealed byseismic reflection/refraction profiling between Zhefang and Binchuan,Yunnan.Science in China(Series D)(in Chinese),2005,48(9):1329~1336
[8]Zhao LS,Sen MK,Stoffa P,et al.Application of veryfast simulated annealingtothe determination of the crustal structure beneath Tibet.Geophys.J.Int.,1996,125:355~370
[9]周莹.接收台站精细地壳结构的波形反演[硕士论文].北京:中国科学院地球物理研究所,1999Zhou Y.Waveforminverse for fine crustal structure beneath seismic station[M.A.thesis](in Chinese).Beijing:Institute of Geophysics,Chinese Academy of Sciences,1999
[10]王卫民,姚振兴.用转换函数方法研究台湾地区三维深部结构.地球物理学报,2003,46(5):628~632Wang WM,Yao Z X.Astudy on the3D crustal structure beneath Taiwan by teleseismic transform function method.Chinese J.Geophys.(in Chinese),2003,46(5):628~632
[11]高星,王卫民,姚振兴.中国及邻近地区地壳结构.地球物理学报,2005,48(3):591~601Gao X,Wang W M,Yao Z X.Crustal structure of China mainland andits adjacent regions.Chinese J.Geophys.(in Chinese),2005,48(3):591~601
[12]朱介寿,曹家敏,蔡学林等.中国及邻近陆域海域地球内部三维结构及动力学研究.地球科学进展,2003,18(4):497~503Zhu J S,Cao J M,Cai X L,et al.Study for three-dimensional structure of earthinterior and geodynamicsin China and adjacent land andsea regions.Advance in Earth Sciences(in Chinese),2003,18(4):497~503
[13]刘启元,Kind R,李顺成.中国数字地震台网的接收函数及其非线性反演.地球物理学报,1997,40(3):356~367Liu QY,Kind R,Li S C.The receiverfunctions at the stations of the Chinese digital seismic network(CDSN)and their nonlinear inversion.Chinese J.Geophys.(in Chinese),1997,40(3):356~367
[14]王椿镛,W.D.Mooney,王溪莉,吴建平等.川滇地区地壳上地幔三维速度结构研究.地震学报,2002,24(1):1~16Wang C Y,W.D.Mooney,Wang XL,Wu J P,et al.Study on3-D velocity structure of crust and upper mantle in Sichuan-Yunnan region,China.Acta Seismologica Sinica,2002,24(1):1~16
[15]Royden L H,Burchfiel B C,King R W,et al.Surface deformation andlower crustal flowin eastern Tibet.Science,1997,276:788~790
[16]SchoenbohmL M,Burchfiel B C,Chen L,Yin J.Miocene to present activity alongthe Red River fault,China,inthe context of continental extrusion,upper-crustal rotation,and lower-crustal flow.Geol.Soc.Amer.Bull.,2006,118:672~688
[17]黄怀曾,吴功建等.岩石圈动力学研究.北京:地质出版社,1994.131Huang HZ,Wu G J,et al.Researches on Lithospheric Dynamics.Beijing:Geological Publishing House,1994.131
[18]Wittlinger G,Tapponnier P,Poupinet G,Jiang M,et al.Tomographic evidencefor localized lithospheric shear along the Altyn Tagh fault.Science,1998,282:74~76
[19]Liu J H,Liu F T,He J K,et al.Seismic tomographic research onthe Panxi paleorift:implication on crust-mantle structure and its evolution.Science in China(D),2001,44(3):277~288
[20]秦嘉政,皇甫岗,李强等.腾冲火山及其邻区速度结构的三维层析成像.地震研究,2000,23(2):157~163Qin J Z,Huang F G,Li Q,et al.3-Dtomography of velocitystructure in Tengchong Volcano areas and nearby.Journal of Seismological Research(in Chinese),2000,23(2):157~163
[21]贺传松,王椿镛,吴建平.腾冲火山区S波速度结构接收函数反演.地震学报,2004,26(1):11~18He C S,Wang C Y,Wu J P.S-wave velocity structure inferred from receiver function inversion in Tengchong Volcanic Area.Journal of Seismological Research(in Chinese),2004,26(1):11~18
[22]王椿镛,皇甫岗,万登堡等.腾冲火山区地壳结构的人工地震探测.地震研究,2000,23(2):148~156Wang C Y,Huang F G,Wan D B,et al.Deep seismic sounding of crustal structure in Tengchong Volcanic area.Journal of Seismological Research(in Chinese),2000,23(2):148~156
[23]吴建平,明跃红,王椿镛.云南数字地震台站下方的S波速度结构研究.地球物理学报,2001,44(2):228~237Wu J P,Ming YH,Wang C Y.The S wave velocitystructure beneath digital seismic stations of Yunnan province inferred fromteleseismic receiver function modeling.Chinese J.Geophys.(in Chinese),2001,44(2):228~237
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心