长白山天池火山区及邻近地区壳幔结构探测研究
|
摘要
对长白—敦化深地震测深剖面资料利用二维射线追踪程序包进行走时拟合及地震图计算 ,得到了长白山天池火山区及邻近地区地壳上地幔速度结构和深部构造 .结果表明 ,以C2 界面为标志 ,研究区地壳可分为上部地壳和下部地壳 .上部地壳厚 1 9— 2 3km ,P波速度为 6 0 0— 6 2 5km s;下部地壳厚 1 2— 1 7km ,它是由一个较均匀的速度层和一个厚 6— 9km的壳幔过渡层构成 .地壳厚度由敦化一带 31— 33km向东南逐渐增厚 ,至天池火山区最深达39km .在天池火山区地壳存在低速体 ,其速度较周围介质低约为 0 1 5km s.利用地震剖面探测、地震CT和大地电磁测深等结果显示 ,在天池火山区地壳内存在低速、低密度及低阻异常体 ,该异常体可能表明壳内岩浆囊的存在 .
In this paper 2-D ray tracing software package is used to compute synthetic seismogram and to fit travel time data of Changbai-Dunhua DSS profile. The crustal and upper mantle velocity structure and deep tectonic feature in Tianchi volcanic region and its adjacent area of Changbaishan are obtained. The results show that the crust in this region consists of the upper crust and the lower crust separated by C_2 interface. The upper crust is 19-23km thick, P wave velocity is 6.00-6.25km/s. The lower crust is 12-17km thick, which consists of a homogeneous velocity layer and a transient layer of 6-9km thick. The crustal thickness is 31-33km thick in the Dunhua, and becomes thicker gradually towards the southeast direction, reaching 39km deep in the Tianchi volcanic region. There is a low velocity body in Tianchi volcanic region, and its velocity is lower about 0.15km/s than its adjacent medium velocity. The results of the seismic prospecting, seismic tomography and magnetotelluric sounding show that there is a low velocity, low density and low resistivity abnormal body, suggesting a magma chamber in the crust of this region.
In this paper 2-D ray tracing software package is used to compute synthetic seismogram and to fit travel time data of Changbai-Dunhua DSS profile. The crustal and upper mantle velocity structure and deep tectonic feature in Tianchi volcanic region and its adjacent area of Changbaishan are obtained. The results show that the crust in this region consists of the upper crust and the lower crust separated by C_2 interface. The upper crust is 19-23km thick, P wave velocity is 6.00-6.25km/s. The lower crust is 12-17km thick, which consists of a homogeneous velocity layer and a transient layer of 6-9km thick. The crustal thickness is 31-33km thick in the Dunhua, and becomes thicker gradually towards the southeast direction, reaching 39km deep in the Tianchi volcanic region. There is a low velocity body in Tianchi volcanic region, and its velocity is lower about 0.15km/s than its adjacent medium velocity. The results of the seismic prospecting, seismic tomography and magnetotelluric sounding show that there is a low velocity, low density and low resistivity abnormal body, suggesting a magma chamber in the crust of this region.
引文
1)张先康.长白山天池火山区岩浆系统、地壳结构的三维深地震测深探测研究.郑州:中国地震局物探中心,1999.
[1] 刘若新,魏海泉,汤吉等.长白山天池火山研究进程.地震地磁观测与研究,1996,17(4):2—11.LIURuoXin,WEIHaiQuan,TANGJi,etal.ProgressofthestudyonTianchivolcano,Changbaishan.SeismologicalandGeomagneticObservationandResearch,(inChinese),1996,17(4):2—11.
[2] 刘若新,李继泰,魏海泉等.长白山天池火山———一座具潜在喷发危险的近代火山.地球物理学报,1992,35(5):661—664.LIURuoXin,LIJiTai,WEIHaiQuan,etal.VolcanoatTianchilake,Changbaishan—amodernvolcanowithpotentialdangeroferuption.ChineseJ.Geophys.(ActaGeophysicaSinica),1992,35(5):661—664.
[3] 刘若新,魏海泉,李继泰等.长白山天池火山.见:刘若新主编.火山作用与人类环境.北京:地震出版社,1995.1—13.LIURuoXin,WEIHaiQuan,LIJiTai,etal.Changbaishantianchivolcano.In:LiuRuoXined.VolcanicFunctionandMankindEnvironment,(inChinese),Beijing:SeismologicalPress,1995.1—13.
[4] 上官志冠,郑雅琴,董继川.长白山天池火山地热区逸出气体的物质来源.中国科学(D辑),1997,27(4):318—324.SHANGGUANZhiGuan,ZHENGYaQin,DONGJiChuan.MatterSourceofreleasedgasinChangbaishanTianchivolcanicgeothermalregion.ScienceinChina(SeriesD)(inChinese),1997,27(4):318—324.
[5] 上官志冠,孙明良.长白山天池火山区幔源稀有气体释放特征.科学通报,1996,41(18):1695—1698.SHANGGUANZhiGuan,SUNMingLiang.ReleasingcharacteristicofraregasfrommantleinChangbaishanTianchivolcanicregion.ChineseScienceBulletin(inChinese),1996,41(18):1695—1698.
[6] 刘若新,魏海泉,李继泰等.长白山天池火山近代喷发.北京:科学出版社,1998.LIURuoXin,WEIHaiQuan,LIJiTai,etal.TheRecentEruptionofTianchiVolcano,Changbaishan,(inChinese),Beijing:SciencePress,1998.
[7] 马明志,张兴科,侯立平.长白山天池火山地震类型与地震分布.地震地磁观测与研究,1996,17(6):39—44.MAMingZhi,ZHANGXingKe,HOULiPing.VolcanicearthquaketypesanddistributionatTianchi,Changbaishan.SeismologicalandGeomagneticObservationandResearch(inChinese),1996,17(6):39—44.
[8] 郭履灿,马石庄,张禹慎.应用地震CT技术研究长白山火山的岩浆囊.CT理论与应用研究,1996,5(1):47—52.GUOLuCan,MAShiZhuang,ZHANGYuShen.StudyofappliedseismicCTonChan baishanvolcanomagmachamber.CTTheoryandApplications(inChinese),1996,5(1):47—52.
[9] 汤吉,刘铁胜,江钊等.长白山天池火山区大地电磁测深初步观测.地震地质,1997,19(2):164—170.TANGJi,LIUTieSheng,JIANGZhao,etal.PreliminaryobservationsoftheTianchivolcanoareainChangbaishanmountainbyMTmethod.SeismologyandGeology(inChinese),1997,19(2):164—170.
[10] 汤吉,邓前辉,赵国泽等.长白山天池火山区电性结构和岩浆系统.地震地质,2001,23(2):191—200.TANGJi,DENGQianHui,ZHAOGuoZe,etal.ElectricconductivityandmagmachamberattheTianchivolcanoareainChangbaishanmountain.SeismologyandGeology(inChingess),2001,23(2):191—200.
[11] MichelB ,HirnA .Velocity depthestimationfromWideangleseismicreflectionarrivals.AnnalesdeGeophysique,1980,36(1):107—118.
[12] GervenyV .Raytheoreticalseismogramsforlaterallyinhomogeneousstructures.J.Geophys,1979,46:335—342.
[13] HolbrookWS ,MooneyWD ,andChristensenNI..Theseismicvelocitystructureofthecontinentalcrust.In:FountainDM ,etal.eds.,TheContinentalLowerCrust.Netherlands:ElsevierSciencePublishers.1992,1—43.
[14] 张先康,王椿镛,刘国栋等.延庆—怀来地区地壳结构———利用深地震反射剖面.地球物理学报,1996,39(3):356—364.ZHANGXianKang,WANGChunYong,LIUGuoDong,etal.FinecrustalstructureinYanqingHuailairegionbydeepseismicreflectionprofiling.ChineseJ.Geophys.(ActaGeophysicaSinica),1996,39(3):356—364.
[1] 刘若新,魏海泉,汤吉等.长白山天池火山研究进程.地震地磁观测与研究,1996,17(4):2—11.LIURuoXin,WEIHaiQuan,TANGJi,etal.ProgressofthestudyonTianchivolcano,Changbaishan.SeismologicalandGeomagneticObservationandResearch,(inChinese),1996,17(4):2—11.
[2] 刘若新,李继泰,魏海泉等.长白山天池火山———一座具潜在喷发危险的近代火山.地球物理学报,1992,35(5):661—664.LIURuoXin,LIJiTai,WEIHaiQuan,etal.VolcanoatTianchilake,Changbaishan—amodernvolcanowithpotentialdangeroferuption.ChineseJ.Geophys.(ActaGeophysicaSinica),1992,35(5):661—664.
[3] 刘若新,魏海泉,李继泰等.长白山天池火山.见:刘若新主编.火山作用与人类环境.北京:地震出版社,1995.1—13.LIURuoXin,WEIHaiQuan,LIJiTai,etal.Changbaishantianchivolcano.In:LiuRuoXined.VolcanicFunctionandMankindEnvironment,(inChinese),Beijing:SeismologicalPress,1995.1—13.
[4] 上官志冠,郑雅琴,董继川.长白山天池火山地热区逸出气体的物质来源.中国科学(D辑),1997,27(4):318—324.SHANGGUANZhiGuan,ZHENGYaQin,DONGJiChuan.MatterSourceofreleasedgasinChangbaishanTianchivolcanicgeothermalregion.ScienceinChina(SeriesD)(inChinese),1997,27(4):318—324.
[5] 上官志冠,孙明良.长白山天池火山区幔源稀有气体释放特征.科学通报,1996,41(18):1695—1698.SHANGGUANZhiGuan,SUNMingLiang.ReleasingcharacteristicofraregasfrommantleinChangbaishanTianchivolcanicregion.ChineseScienceBulletin(inChinese),1996,41(18):1695—1698.
[6] 刘若新,魏海泉,李继泰等.长白山天池火山近代喷发.北京:科学出版社,1998.LIURuoXin,WEIHaiQuan,LIJiTai,etal.TheRecentEruptionofTianchiVolcano,Changbaishan,(inChinese),Beijing:SciencePress,1998.
[7] 马明志,张兴科,侯立平.长白山天池火山地震类型与地震分布.地震地磁观测与研究,1996,17(6):39—44.MAMingZhi,ZHANGXingKe,HOULiPing.VolcanicearthquaketypesanddistributionatTianchi,Changbaishan.SeismologicalandGeomagneticObservationandResearch(inChinese),1996,17(6):39—44.
[8] 郭履灿,马石庄,张禹慎.应用地震CT技术研究长白山火山的岩浆囊.CT理论与应用研究,1996,5(1):47—52.GUOLuCan,MAShiZhuang,ZHANGYuShen.StudyofappliedseismicCTonChan baishanvolcanomagmachamber.CTTheoryandApplications(inChinese),1996,5(1):47—52.
[9] 汤吉,刘铁胜,江钊等.长白山天池火山区大地电磁测深初步观测.地震地质,1997,19(2):164—170.TANGJi,LIUTieSheng,JIANGZhao,etal.PreliminaryobservationsoftheTianchivolcanoareainChangbaishanmountainbyMTmethod.SeismologyandGeology(inChinese),1997,19(2):164—170.
[10] 汤吉,邓前辉,赵国泽等.长白山天池火山区电性结构和岩浆系统.地震地质,2001,23(2):191—200.TANGJi,DENGQianHui,ZHAOGuoZe,etal.ElectricconductivityandmagmachamberattheTianchivolcanoareainChangbaishanmountain.SeismologyandGeology(inChingess),2001,23(2):191—200.
[11] MichelB ,HirnA .Velocity depthestimationfromWideangleseismicreflectionarrivals.AnnalesdeGeophysique,1980,36(1):107—118.
[12] GervenyV .Raytheoreticalseismogramsforlaterallyinhomogeneousstructures.J.Geophys,1979,46:335—342.
[13] HolbrookWS ,MooneyWD ,andChristensenNI..Theseismicvelocitystructureofthecontinentalcrust.In:FountainDM ,etal.eds.,TheContinentalLowerCrust.Netherlands:ElsevierSciencePublishers.1992,1—43.
[14] 张先康,王椿镛,刘国栋等.延庆—怀来地区地壳结构———利用深地震反射剖面.地球物理学报,1996,39(3):356—364.ZHANGXianKang,WANGChunYong,LIUGuoDong,etal.FinecrustalstructureinYanqingHuailairegionbydeepseismicreflectionprofiling.ChineseJ.Geophys.(ActaGeophysicaSinica),1996,39(3):356—364.
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