山东地区壳幔耦合关系探讨
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摘要
通过将山东地区GPS观测结果与穿透整个岩石圈的SKS剪切波分裂及近场资料剪切波分裂的快波方向相比较,来探讨山东地区壳幔运动的耦合作用。结果发现,地壳内近场快剪切波偏振与SKS快剪切波偏振总是相差十几度以上,这种差异可能说明,山东地区壳幔之间构造活动可能有一定程度的解耦,表明山东地区的壳幔运动耦合作用可能既不是壳幔强耦合型,也不是简单的壳幔解耦型,该地区的壳幔运动耦合作用可能是2种模式共存的不均匀分布或者是物理性质介于两者之间的渐变模式,这与早先对华北地区的类似研究获得的结论相同。
GPS observation comparing with the SKS fast-wave polarization through the crustmantle and seismic anisotropy of the crust was used in this paper to study the coupling relationship between the crustal movement and the mantle deformation. We found that the fast-wave polarization in the crust is always a few degrees above ten with the SKS fast-wave. This difference may show the decoupling of crustal movement and mantle deformation in the Shandong region.The characteristic of Shandong region is that the crust-mantle coupling is not simply crust-mantle decoupling,nor a strong coupling. There may be an uneven distribution caused by two kinds of coexistent modes or a gradual change of physical property between the two modes. The finding is consistent with the previous conclusions by the similar studies of North China.
GPS observation comparing with the SKS fast-wave polarization through the crustmantle and seismic anisotropy of the crust was used in this paper to study the coupling relationship between the crustal movement and the mantle deformation. We found that the fast-wave polarization in the crust is always a few degrees above ten with the SKS fast-wave. This difference may show the decoupling of crustal movement and mantle deformation in the Shandong region.The characteristic of Shandong region is that the crust-mantle coupling is not simply crust-mantle decoupling,nor a strong coupling. There may be an uneven distribution caused by two kinds of coexistent modes or a gradual change of physical property between the two modes. The finding is consistent with the previous conclusions by the similar studies of North China.
引文
常利军、王椿镛、丁志峰,2009,中国东部上地幔各向异性研究,中国科学D辑,39(9),1169~1178。
高原、郑斯华、孙勇,1995,唐山地区地壳裂隙各向异性,地震学报,17(3),283~293。
高原、吴晶,2008a,利用剪切波各向异性推断地壳主压应力场———以首都圈地区为例,科学通报,53(23),2933~2939。
高原、石玉涛等,2008b,剪切波分裂分析系统,SAM(2007)———软件系统,中国地震,24(4),345~353。
高原、吴晶、易桂喜等,2010,从壳幔地震各向异性初探华北地区壳幔耦合关系,科学通报,55(29),2837~2843。
太龄雪、高原、石玉涛等,2009,辽宁区域地震台网的地壳剪切波分裂研究,地震地质,31(3),401~414。
石玉涛、高原、赵翠萍等,2009,汶川地震余震序列的地震各向异性,地球物理学报,52(2),398~407。
苗庆杰、刘希强、李永华等,2011,山东地区上地幔各向异性研究,地震学报,33(6),746~754。
任金卫、2004,中国大陆壳幔运动耦合作用分析,地震地质,26(4),566~575。
王椿镛、常利军、吕智勇等,2007,青藏高原东部上地幔各向异性及相关的壳幔耦合型式,中国科学D辑:地球科学,37(4),495~503。
殷海涛、李杰、张玲等,基于GPS观测网的山东地区地壳运动特征分析,西北地震学报,30(3),276~281。
周翠英、王铮铮、蒋海昆等,2005,华东地区现代地壳应力场及地震断层错动性质,地震地质,27(2),273~288。
Bowman J R,Ando M,1987,Shear-wave splitting in the upper-mantle wedge above the Tonga subduction zone,Geophys J RAstron Soc,88(1),25~41.
Barruol G,Silver P G,Vauchez A,1997,Seismic anisotropy in the eastern US:deep structure of a complex continental plate,Geophys Res,102(B4),8329~8348.
Crampin S,1978,Seismic wave propagation through a cracked solid:Polarization as a possible dilatancy diagnostic,Geophys J RAstron Soc,53(3),467~496.
Crampin S,Peacock S,Gao Y et al,2004,The scatter of time-delays in shear-wave splitting above small earthquakes,Geophys JInt,156(1),39~44.
Gao S S,Liu K H,2009,Significant seismic anisotropy beneath the southern Lhasa Terrane,Tibetan Plateau,Geochem GeophysGeosyst,10,Q02008,doi,10.1029/2008GC002227.
Hess H H,1964,Seismic anisotropy of the upper most mantle under oceans,Nature,203(9),629~631.
Mainprice D,Silver P G,1993,Interpretation of SKS wave using samples from the subcontinental lithosphere,Phys Earth PlanetSci,78(3-4),257~280.
Nicolas A,Christensen N I,1987,Formation of anisotropy in upper mantle peridotites:a review in composition structure anddynamics of the lithosphere-asthenosphere system,Geodyn Ser,111~123.
Plomerova J,Sileny J,Babuska V,1996,Joint interpretation of upper-mantle anisotropy based on teleseismic P-travel time delaysand inversion of shear2wave splitting parameters,Phys Earth Planet Int,95(3-4),293~309.
Silver P G,Chan W W,1991,Shear wave splitting and subcontinental mantle deformation,Jour Geophys Res,96(B10),16429~16454.
Silver P G,1996,Seismic anisotropy beneath the continents:Probing the depths of geology,Jour Annu Rev Earth Planet Sci,24,385~432,doi:10.1146/annurev.earth.24.1.385.
Vinnik L P,Green R W E,Nicolaysen L O,1995,Recent deformation of the deep continental root beneath South Africa,Nature,375,50~52,doi:10.1038/375050a0.
Vauchez A,Barruol G,1996,Shear-wave splitting in the Appalachians and the Pyrenees:Importance of the inheritedtectonicfabric of the lithosphere,Phys Earth Planet Int,95(3-4),127~138.
Vecsey L,Plomerova J,Babuska V,2008,Shear-wave splitting measurements—Problems and solutions,Tectonophysics,462(1-4),178~196.
Wang C Y,Flesch L M,Silver P G,et al,2008,Evidence for mechanically coupled lithosphere in central Asia and resultingimplications,Geology,36(5),363~366.
Wüstefeld A,Bokelmann G H R,2007,Null detection in shear-wave splitting measurements,Bull Seismol Soc Am,97(4),1204~1211.
1郑建常等,2009,山东地区地壳介质各向异性与剪切波分裂研究(见:山东省2009年度地震趋势研究报告)
高原、郑斯华、孙勇,1995,唐山地区地壳裂隙各向异性,地震学报,17(3),283~293。
高原、吴晶,2008a,利用剪切波各向异性推断地壳主压应力场———以首都圈地区为例,科学通报,53(23),2933~2939。
高原、石玉涛等,2008b,剪切波分裂分析系统,SAM(2007)———软件系统,中国地震,24(4),345~353。
高原、吴晶、易桂喜等,2010,从壳幔地震各向异性初探华北地区壳幔耦合关系,科学通报,55(29),2837~2843。
太龄雪、高原、石玉涛等,2009,辽宁区域地震台网的地壳剪切波分裂研究,地震地质,31(3),401~414。
石玉涛、高原、赵翠萍等,2009,汶川地震余震序列的地震各向异性,地球物理学报,52(2),398~407。
苗庆杰、刘希强、李永华等,2011,山东地区上地幔各向异性研究,地震学报,33(6),746~754。
任金卫、2004,中国大陆壳幔运动耦合作用分析,地震地质,26(4),566~575。
王椿镛、常利军、吕智勇等,2007,青藏高原东部上地幔各向异性及相关的壳幔耦合型式,中国科学D辑:地球科学,37(4),495~503。
殷海涛、李杰、张玲等,基于GPS观测网的山东地区地壳运动特征分析,西北地震学报,30(3),276~281。
周翠英、王铮铮、蒋海昆等,2005,华东地区现代地壳应力场及地震断层错动性质,地震地质,27(2),273~288。
Bowman J R,Ando M,1987,Shear-wave splitting in the upper-mantle wedge above the Tonga subduction zone,Geophys J RAstron Soc,88(1),25~41.
Barruol G,Silver P G,Vauchez A,1997,Seismic anisotropy in the eastern US:deep structure of a complex continental plate,Geophys Res,102(B4),8329~8348.
Crampin S,1978,Seismic wave propagation through a cracked solid:Polarization as a possible dilatancy diagnostic,Geophys J RAstron Soc,53(3),467~496.
Crampin S,Peacock S,Gao Y et al,2004,The scatter of time-delays in shear-wave splitting above small earthquakes,Geophys JInt,156(1),39~44.
Gao S S,Liu K H,2009,Significant seismic anisotropy beneath the southern Lhasa Terrane,Tibetan Plateau,Geochem GeophysGeosyst,10,Q02008,doi,10.1029/2008GC002227.
Hess H H,1964,Seismic anisotropy of the upper most mantle under oceans,Nature,203(9),629~631.
Mainprice D,Silver P G,1993,Interpretation of SKS wave using samples from the subcontinental lithosphere,Phys Earth PlanetSci,78(3-4),257~280.
Nicolas A,Christensen N I,1987,Formation of anisotropy in upper mantle peridotites:a review in composition structure anddynamics of the lithosphere-asthenosphere system,Geodyn Ser,111~123.
Plomerova J,Sileny J,Babuska V,1996,Joint interpretation of upper-mantle anisotropy based on teleseismic P-travel time delaysand inversion of shear2wave splitting parameters,Phys Earth Planet Int,95(3-4),293~309.
Silver P G,Chan W W,1991,Shear wave splitting and subcontinental mantle deformation,Jour Geophys Res,96(B10),16429~16454.
Silver P G,1996,Seismic anisotropy beneath the continents:Probing the depths of geology,Jour Annu Rev Earth Planet Sci,24,385~432,doi:10.1146/annurev.earth.24.1.385.
Vinnik L P,Green R W E,Nicolaysen L O,1995,Recent deformation of the deep continental root beneath South Africa,Nature,375,50~52,doi:10.1038/375050a0.
Vauchez A,Barruol G,1996,Shear-wave splitting in the Appalachians and the Pyrenees:Importance of the inheritedtectonicfabric of the lithosphere,Phys Earth Planet Int,95(3-4),127~138.
Vecsey L,Plomerova J,Babuska V,2008,Shear-wave splitting measurements—Problems and solutions,Tectonophysics,462(1-4),178~196.
Wang C Y,Flesch L M,Silver P G,et al,2008,Evidence for mechanically coupled lithosphere in central Asia and resultingimplications,Geology,36(5),363~366.
Wüstefeld A,Bokelmann G H R,2007,Null detection in shear-wave splitting measurements,Bull Seismol Soc Am,97(4),1204~1211.
1郑建常等,2009,山东地区地壳介质各向异性与剪切波分裂研究(见:山东省2009年度地震趋势研究报告)
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