2006年12月26日台湾屏东地震机制的地球动力学成因探讨
摘要
2006年12月26日发生了屏东Mw7.0级强烈地震,之后Harvard,USGS和中国台湾的BATS分别对其进行了定位.不同来源的震源机制研究结果均认为该地震属于正断层地震,但震源深度定位差别很大.多数学者都支持本次地震震源深度为40～44km之间.为进一步探讨本次地震的地球动力学成因,根据上述结果,在详细计算相关参数后进行了二维有限元数值实验分析.结果表明屏东地震发生的主要动力学背景与成因为:由于弧-陆碰撞的作用使得台湾地区地壳部分整体处于北西-南东向压应力状态,但由于柔性下地壳的存在,使得上地壳变形与岩石圈地幔变形解耦,岩石圈地幔板片在弯曲俯冲的过程中,会在其上表面处于拉张状态从而形成正断层机制的地震.
引文
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4Lee S J,Liang W T,Huang B S.Source mechanisms and rupture processes of the26December2006Pingtung earthquake doublet as determined from the regional seismic records.Terr Atmos Ocean Sci,2008,19:555—566
5张超凡.地震海啸和滑坡海啸的产生和传播过程数值模拟.硕士学位论文.北京:中国科学院研究生院,2008.34—38
6Wu Y M,Zhao L,Chang C H,et al.Relocation of the2006Pingtung earthquake sequence and seismotectonics in southern Taiwan.Tectonophysics,2009,479:19—27
7Liao Y C,Hsu S K,Chang C H,et al.Seismic tomography off SW Taiwan:A joint inversion from OBS and onshore data of2006Pingtung aftershocks.Terr Atmos Ocean Sci,2008,19:729—742
8Kao H,Chen W P.Seismicity in the outer rise-forearc region and configuration of the subducting lithosphere with special reference to the Japan trench.J Geophys Res,1996,101:27811—27831
9Dmowska R,Zheng G,Rice J R.Seismicity and deformation at convergent margins due to heterogeneous coupling.J Geophys Res,1996,101:3015—3029
10Abercrombie R E,Antolik M,Felzer K,et al.The1994Java tsunami earthquake:Slip over a subducting seamount.J Geophys Res,2001,106:6595—6607
11Kao H,Huang G C,Liu C S.Transition from oblique subduction to collision in the northern Luzon arc-Taiwan region:Constraints from bathmetry and seismic observations.J Geophys Res,2000,105:3059—3079
12Kaus B J P,Liu Y C,Becker T W,et al.Lithospheric stress-states predicted from long-term tectonic models:Influence of rheology and possible application to Taiwan.J Asian Earth Sci,2009,36:119—134
13Yu S B,Chen H Y,Kuo L C.Velocity field of GPS stations in the Taiwan area.Tectonophysics,1997,274:41—59
14Yu S B,Chen Y H.Global positioning system measurements of crustal deformation in the Taiwan arc-continent collision zone.Terr Atmos Ocean Sci,1994,5:477—498
15Heidbach O,Tingay M,Barth A,et al.The World Stress Map database release.2008,doi:10.1594/GFZ.WSM.Rel2008.2008
16郑魁香.台湾地区强震发生的构造环境与地震活动性分析.地震地质,2002,24:400—411
17Wang C Y,Shin T C.Illustrating100years of Taiwan seismicity.Terr Atmos Ocean Sci,1998,9:589—614
18Wu Y M,Chang C H,Zhao L,et al.A comprehensive relocation of earthquakes in Taiwan from1991to2005.Bull Seismol Soc Am,2008,98:1471—1481
19Wang Z,Zhao D,Wang J,et al.Tomographic evidence for the Eurasian lithosphere subducting beneath south Taiwan.Geophys Res Lett,2006,33:L18306
20McIntosh K,Nakamura Y,Wang T K,et al.Crustal-scale seismic profiles across Taiwan and the western Philippine Sea.Tectonophysics,2005,401:23—54
21石耀霖,范桃园.大洋板块拖曳窄条陆壳俯冲——大规模超高压变质形成的条件.地质学报,2002,76:77—82
22Lin C H.Thermal modeling of continental subduction and exhumation constrained by heat flow and seismicity in Taiwan.Tectonophysics,2000,324:189—201
23臧绍先,宋惠珍,宁杰远.日本海俯冲带的热结构及热源的影响.地球物理学报,1993,36:164—173
24Turcotte D L,Schubert G.Geodynamics.Cambridge:Cambridge University Press,1986.226—291
25Shiono K,Sugi N.Life of an oceanic plate:Cooling time and assimilation time.Tectonophysics,1985,112:35—50
26Karato S.Deformation of Earth Materials.New York:Cambridge University Press,2008.305—322
27Byerlee J D.Friction of rocks.Pure Appl Geophys,1978,116:615—626
28Sibson R H.Frictional constraints on thrust,wrench and normal faults.Nature,1974,249:542—544
29Ma K F,Song T R A.Thermo-mechanical structure beneath the young orogenic belt of Taiwan.Tectonophysics,2004,388:21—31
30Ranalli G,Murphy D C.Rheological stratification of the lithosphere.Tectonophysics,1987,132:281—295
31石耀霖,曹建玲.中国大陆岩石圈等效黏滞性系数的计算和讨论.地学前缘,2008,15:82—95
32安美建,石耀霖.中国大陆地壳和上地幔三维温度场.中国科学D辑:地球科学,2007,37:736—745
33Carter N L,Tsenn M C.Flow properties of continental lithosphere.Tectonophysics,1987,136:27—63
34Goetze C.The mechanisms of creep in olivine.Philos Trans R Soc London,1978,288:99—119
35Kirby S H,Kronenberg A K.Rheology of the lithosphere:Selected topics.Rev Geophys,1987,25:1219—1244
36Wilks K R,Carter N L.Rheology of some continental lower crustal rock.Tectonophysics,1990,182:57—77
37Zhou D,Yub H S,Xua H H,et al.Modeling of thermo-rheological structure of lithosphere under the foreland basin and mountain belt of Taiwan.Tectonophysics,2003,374:115—134
38Mouthereau F,Petit C.Rheology and strength of the Eurasian continental lithosphere in the foreland of the Taiwan collision belt:Constraints from seismicity,flexure,and structural styles.J Geophys Res,2003,108:2512
39Vita-Finzi C,Lin J C.Neotectonics and seismic hazard assessment in Hengchun Peninsula,southern Taiwan.C R Geosci,2005,337:1194—1199
40Yen H Y,Yeh Y H,Wu F T.Two-dimensional crustal structures of Taiwan from gravity data.Tectonics,1998,17:104—111
41臧绍先,宁杰远.俯冲带的负浮力及其影响因素.地球物理学报,1994,37:174—183
42Conrad C P,Hager B H.Effects of plate bending and fault strength at subduction zones on plate dynamics.J Geophys Res,1999,104:17551—17571
2Yen Y T,Ma K F,Wen Y Y.Slip partition of the26December2006Pingtung,Taiwan(M6.9,M6.8)earthquake doublet determined from teleseismic waveforms.Terr Atmos Ocean Sci,2008,19:567—578
3Chen Y R,Lai Y C,Huang Y L,et al.Investigation of source depths of the2006Pingtung earthquake sequence using a dense array at teleseismic distances.Terr Atmos Ocean Sci,2008,19:579—588
4Lee S J,Liang W T,Huang B S.Source mechanisms and rupture processes of the26December2006Pingtung earthquake doublet as determined from the regional seismic records.Terr Atmos Ocean Sci,2008,19:555—566
5张超凡.地震海啸和滑坡海啸的产生和传播过程数值模拟.硕士学位论文.北京:中国科学院研究生院,2008.34—38
6Wu Y M,Zhao L,Chang C H,et al.Relocation of the2006Pingtung earthquake sequence and seismotectonics in southern Taiwan.Tectonophysics,2009,479:19—27
7Liao Y C,Hsu S K,Chang C H,et al.Seismic tomography off SW Taiwan:A joint inversion from OBS and onshore data of2006Pingtung aftershocks.Terr Atmos Ocean Sci,2008,19:729—742
8Kao H,Chen W P.Seismicity in the outer rise-forearc region and configuration of the subducting lithosphere with special reference to the Japan trench.J Geophys Res,1996,101:27811—27831
9Dmowska R,Zheng G,Rice J R.Seismicity and deformation at convergent margins due to heterogeneous coupling.J Geophys Res,1996,101:3015—3029
10Abercrombie R E,Antolik M,Felzer K,et al.The1994Java tsunami earthquake:Slip over a subducting seamount.J Geophys Res,2001,106:6595—6607
11Kao H,Huang G C,Liu C S.Transition from oblique subduction to collision in the northern Luzon arc-Taiwan region:Constraints from bathmetry and seismic observations.J Geophys Res,2000,105:3059—3079
12Kaus B J P,Liu Y C,Becker T W,et al.Lithospheric stress-states predicted from long-term tectonic models:Influence of rheology and possible application to Taiwan.J Asian Earth Sci,2009,36:119—134
13Yu S B,Chen H Y,Kuo L C.Velocity field of GPS stations in the Taiwan area.Tectonophysics,1997,274:41—59
14Yu S B,Chen Y H.Global positioning system measurements of crustal deformation in the Taiwan arc-continent collision zone.Terr Atmos Ocean Sci,1994,5:477—498
15Heidbach O,Tingay M,Barth A,et al.The World Stress Map database release.2008,doi:10.1594/GFZ.WSM.Rel2008.2008
16郑魁香.台湾地区强震发生的构造环境与地震活动性分析.地震地质,2002,24:400—411
17Wang C Y,Shin T C.Illustrating100years of Taiwan seismicity.Terr Atmos Ocean Sci,1998,9:589—614
18Wu Y M,Chang C H,Zhao L,et al.A comprehensive relocation of earthquakes in Taiwan from1991to2005.Bull Seismol Soc Am,2008,98:1471—1481
19Wang Z,Zhao D,Wang J,et al.Tomographic evidence for the Eurasian lithosphere subducting beneath south Taiwan.Geophys Res Lett,2006,33:L18306
20McIntosh K,Nakamura Y,Wang T K,et al.Crustal-scale seismic profiles across Taiwan and the western Philippine Sea.Tectonophysics,2005,401:23—54
21石耀霖,范桃园.大洋板块拖曳窄条陆壳俯冲——大规模超高压变质形成的条件.地质学报,2002,76:77—82
22Lin C H.Thermal modeling of continental subduction and exhumation constrained by heat flow and seismicity in Taiwan.Tectonophysics,2000,324:189—201
23臧绍先,宋惠珍,宁杰远.日本海俯冲带的热结构及热源的影响.地球物理学报,1993,36:164—173
24Turcotte D L,Schubert G.Geodynamics.Cambridge:Cambridge University Press,1986.226—291
25Shiono K,Sugi N.Life of an oceanic plate:Cooling time and assimilation time.Tectonophysics,1985,112:35—50
26Karato S.Deformation of Earth Materials.New York:Cambridge University Press,2008.305—322
27Byerlee J D.Friction of rocks.Pure Appl Geophys,1978,116:615—626
28Sibson R H.Frictional constraints on thrust,wrench and normal faults.Nature,1974,249:542—544
29Ma K F,Song T R A.Thermo-mechanical structure beneath the young orogenic belt of Taiwan.Tectonophysics,2004,388:21—31
30Ranalli G,Murphy D C.Rheological stratification of the lithosphere.Tectonophysics,1987,132:281—295
31石耀霖,曹建玲.中国大陆岩石圈等效黏滞性系数的计算和讨论.地学前缘,2008,15:82—95
32安美建,石耀霖.中国大陆地壳和上地幔三维温度场.中国科学D辑:地球科学,2007,37:736—745
33Carter N L,Tsenn M C.Flow properties of continental lithosphere.Tectonophysics,1987,136:27—63
34Goetze C.The mechanisms of creep in olivine.Philos Trans R Soc London,1978,288:99—119
35Kirby S H,Kronenberg A K.Rheology of the lithosphere:Selected topics.Rev Geophys,1987,25:1219—1244
36Wilks K R,Carter N L.Rheology of some continental lower crustal rock.Tectonophysics,1990,182:57—77
37Zhou D,Yub H S,Xua H H,et al.Modeling of thermo-rheological structure of lithosphere under the foreland basin and mountain belt of Taiwan.Tectonophysics,2003,374:115—134
38Mouthereau F,Petit C.Rheology and strength of the Eurasian continental lithosphere in the foreland of the Taiwan collision belt:Constraints from seismicity,flexure,and structural styles.J Geophys Res,2003,108:2512
39Vita-Finzi C,Lin J C.Neotectonics and seismic hazard assessment in Hengchun Peninsula,southern Taiwan.C R Geosci,2005,337:1194—1199
40Yen H Y,Yeh Y H,Wu F T.Two-dimensional crustal structures of Taiwan from gravity data.Tectonics,1998,17:104—111
41臧绍先,宁杰远.俯冲带的负浮力及其影响因素.地球物理学报,1994,37:174—183
42Conrad C P,Hager B H.Effects of plate bending and fault strength at subduction zones on plate dynamics.J Geophys Res,1999,104:17551—17571
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