西太平洋Benioff带的形态及其应力状态
|
摘要
利用 1 970～ 1 998年的地震资料 ,研究了西太平洋Wadati Benioff带形态 ,发现各区域Wadati Benioff带的倾角与板块俯冲速度有关 ,俯冲速度越大 ,倾角越小 ;利用 1 976～ 2 0 0 2年哈佛大学的震源机制资料 ,对各区域地震断层类型进行了统计 ,结果表明 :地震断层类型也与俯冲速度有关 ,俯冲速度大的地区逆断层数量高达 74 %以上 ,俯冲速度小的地区正断层数量上升到 4 5 %左右 ;本文还探讨了西太平洋板块水平向运移的主动力方向 ,认为该方向为2 83°.
The distribution of earthquakes in the western Pacific is studied using the hypocenters determined by ISC. from 1970 to 1998. The result shows that the dip angles of the Benioff zone are correlated with velocity of the plate movement in different regions. The dip angles become smaller when the speed becomes larger. Focal mechanisms of events M b≥5.0 from 1976 to 2002 are analyzed using the data from Harvard university. It shows that types of faults are related with velocity of plate motion. In the area of higher velocity of plate motion, the number of thrust faults is more than 74% of the total. In the area of smaller one, the proportion of normal faults raises up to about 45%. The western Pacific horizontal movement dominants force direction, which is 283°.
The distribution of earthquakes in the western Pacific is studied using the hypocenters determined by ISC. from 1970 to 1998. The result shows that the dip angles of the Benioff zone are correlated with velocity of the plate movement in different regions. The dip angles become smaller when the speed becomes larger. Focal mechanisms of events M b≥5.0 from 1976 to 2002 are analyzed using the data from Harvard university. It shows that types of faults are related with velocity of plate motion. In the area of higher velocity of plate motion, the number of thrust faults is more than 74% of the total. In the area of smaller one, the proportion of normal faults raises up to about 45%. The western Pacific horizontal movement dominants force direction, which is 283°.
引文
[1] McKenzieDP ,ParkerRL .NorthPacific:anexampleoftectonicsonsphere.Nature,1967,216:1276～1280
[2] MorganWJ.Rises,trenches,greatfaultsandcrustalblocks.J .Geo phys.Res.,1968,73:1959～1982
[3] LePichonX .Sea floorspreadingandcontinentaldrift.J .Geophys.Res.,1968,73:3661～3697
[4] WadatiK .Ontheactivityofdeep focusearthquakesinthejapanis landsandneighborhoods.Geophys.Mag.,1935,8:305～325
[5] BenioffH .Orogenesisanddeepcrustalstructure:additionalevidencefromseismicity.Geol.Soc.Amer.Bull.,1954,65:385～400
[6] 吴忠良,臧绍先.千岛—鄂霍次克海地区的地震分布、震源机制及应力状态.地震地质,1989,11(2):85～95WuZL ,ZangSX .DistributionandfocalmechanismofearthquakesandstressstateonKurilislandsandseaofOkhotsk.SeismologyandGeology(inChinese),1989,11(2):85～95
[7] 宁杰远,臧绍先.日本海及中国东北地震的深度分布及其应力状态.地震地质,1987,9(2):49～61NingJY ,ZangSX .ThedistributionofearthquakesandstressstateintheJapanseaandthenortheastChina.SeismologyandGeology(inChinese),1987,9(2):49～61
[8] 臧绍先,宁杰远.西太平洋俯冲带的研究及其动力学意义.地球物理学报,1996,39(2):188～202ZangSX ,NingJY .Studyonthesubductionzoneinwesternpacificanditsimplicationforthegeodynamics.ChineseJ.Geophys.(ActaGeophysicaSinica)(inChinese),1996,39(2):188～202
[9] 朱介寿,曹家敏,蔡学林等.东亚及西太平洋边缘海高分辨率面波层析成像.地球物理学报,2002,45(5):646～664ZhuJS ,CaoJM ,CaiXL ,etal.Highresolutionsurfacewaveto mographyineastAsiaandwestPacificmarginalseas.ChineseJ .Geophys.(inChinese),2002,45(5):646～664
[10] 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(2):174～183ZangSX ,NingJY .Thenegativebuoyancyofthesubductionzoneanditsaffectingfactors.ChineseJ.Geophys.(ActaGeophysicaSini ca)(inChinese),1994,37(2):174～183
[11] FukaoY ,ObayashiM ,InoueH ,etal.Subductingslabstagnantinmantletransitionzone.JournalofGeophysicalResearch,1992,97:4809～4822
[12] VanderHilstRD ,EngdahlER ,SpakmanW ,etal.TomographicimagingofsubductedLithospaherebelownorthwestPacificislandarcs.Nature,1991,353:37～43
[13] 周元泽,臧绍先.牡丹江和海拉尔台下方地幔间断面结构及推论.地球物理学报,2001,44(6):761～773ZhouYZ ,ZangSX .MantlediscontinuitiesbeneaththestationsMDJandHIAanditsimplications.ChineseJ.Geophys.(inChinese),2001,44(6):761～773
[14] 孙文斌,和跃时,李英波.日本海区板块俯冲与华北地震.地震学报,1985,7(1):33～44SunWB ,HeYS ,LiYB .SubductionofthepacificplateintheseaofJapanandearthquakesofnortheasternChina.ActaSeismologicaSinica(inChinese),1985,7(1):33～44
[15] 洪汉净,于 泳,郑秀珍等.全球火山活动分布特征.地学前缘,2003,10(增刊):11～16HongHJ ,YuY ,ZhengXZ ,etal.Globalvolcanodistribution:pat ternandvariation.EarthScienceFrontiers,2003,10(Suppl.):11～16
[2] MorganWJ.Rises,trenches,greatfaultsandcrustalblocks.J .Geo phys.Res.,1968,73:1959～1982
[3] LePichonX .Sea floorspreadingandcontinentaldrift.J .Geophys.Res.,1968,73:3661～3697
[4] WadatiK .Ontheactivityofdeep focusearthquakesinthejapanis landsandneighborhoods.Geophys.Mag.,1935,8:305～325
[5] BenioffH .Orogenesisanddeepcrustalstructure:additionalevidencefromseismicity.Geol.Soc.Amer.Bull.,1954,65:385～400
[6] 吴忠良,臧绍先.千岛—鄂霍次克海地区的地震分布、震源机制及应力状态.地震地质,1989,11(2):85～95WuZL ,ZangSX .DistributionandfocalmechanismofearthquakesandstressstateonKurilislandsandseaofOkhotsk.SeismologyandGeology(inChinese),1989,11(2):85～95
[7] 宁杰远,臧绍先.日本海及中国东北地震的深度分布及其应力状态.地震地质,1987,9(2):49～61NingJY ,ZangSX .ThedistributionofearthquakesandstressstateintheJapanseaandthenortheastChina.SeismologyandGeology(inChinese),1987,9(2):49～61
[8] 臧绍先,宁杰远.西太平洋俯冲带的研究及其动力学意义.地球物理学报,1996,39(2):188～202ZangSX ,NingJY .Studyonthesubductionzoneinwesternpacificanditsimplicationforthegeodynamics.ChineseJ.Geophys.(ActaGeophysicaSinica)(inChinese),1996,39(2):188～202
[9] 朱介寿,曹家敏,蔡学林等.东亚及西太平洋边缘海高分辨率面波层析成像.地球物理学报,2002,45(5):646～664ZhuJS ,CaoJM ,CaiXL ,etal.Highresolutionsurfacewaveto mographyineastAsiaandwestPacificmarginalseas.ChineseJ .Geophys.(inChinese),2002,45(5):646～664
[10] 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(2):174～183ZangSX ,NingJY .Thenegativebuoyancyofthesubductionzoneanditsaffectingfactors.ChineseJ.Geophys.(ActaGeophysicaSini ca)(inChinese),1994,37(2):174～183
[11] FukaoY ,ObayashiM ,InoueH ,etal.Subductingslabstagnantinmantletransitionzone.JournalofGeophysicalResearch,1992,97:4809～4822
[12] VanderHilstRD ,EngdahlER ,SpakmanW ,etal.TomographicimagingofsubductedLithospaherebelownorthwestPacificislandarcs.Nature,1991,353:37～43
[13] 周元泽,臧绍先.牡丹江和海拉尔台下方地幔间断面结构及推论.地球物理学报,2001,44(6):761～773ZhouYZ ,ZangSX .MantlediscontinuitiesbeneaththestationsMDJandHIAanditsimplications.ChineseJ.Geophys.(inChinese),2001,44(6):761～773
[14] 孙文斌,和跃时,李英波.日本海区板块俯冲与华北地震.地震学报,1985,7(1):33～44SunWB ,HeYS ,LiYB .SubductionofthepacificplateintheseaofJapanandearthquakesofnortheasternChina.ActaSeismologicaSinica(inChinese),1985,7(1):33～44
[15] 洪汉净,于 泳,郑秀珍等.全球火山活动分布特征.地学前缘,2003,10(增刊):11～16HongHJ ,YuY ,ZhengXZ ,etal.Globalvolcanodistribution:pat ternandvariation.EarthScienceFrontiers,2003,10(Suppl.):11～16
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