南海北部海盆三分量磁测结果分析
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摘要
1994年,中日双方合作在南海北部开展了海洋三分量磁测实验工作,采用日本东京大学地震研究所新研制的船载三分量磁力仪(Shipboard Three Component Magnetmeter,STCM)在南海北部海盆成功获得了6条共约2 500km的三分量磁测资料。本文根据前人的研究思路实现了对实测三分量磁测资料的处理分析,改进了补偿圆滑滤波算法,首次提出了比原方法更加综合直观表示测区各种磁边界状况的磁边界走向图(Magnetic boundary strikediagram,MBSD)法,并且将处理结果与南海北部海盆已识别的磁条带及其他一些典型地质现象进行了对比分析,发现本方法所揭示出的二维及三维磁边界与南海的实际地质状况有良好的吻合关系,这表明该方法可以有效处理所采集的三分量磁测资料并对研究海底磁性构造体性质有帮助。
In 1994,Sino-Japan cooperative cruise for shipboard three-component magnetic field test was carried out in northern region of the South China Sea,using new Shipboard Three Component Magnetometer(STCM) developed by the Earthquake Institute of Tokyo University.About 2 500 km(6 lines) field survey data were acquired successfully.According to the magnetic boundary strike diagram(MBSD) method proposed by Seama N et al.,the author analyzes these data and points out that the MBSD method can be used to express types of magnetic boundary synthetically and visibly.The author then conducts comparative analysis on the calculated result and the verified magnetic lineation of northern South China Sea basin and finds that they agree with each other very well.That study suggests that the MBSD method is useful when dealing with STCM data and studying marine magnetic structure.
In 1994,Sino-Japan cooperative cruise for shipboard three-component magnetic field test was carried out in northern region of the South China Sea,using new Shipboard Three Component Magnetometer(STCM) developed by the Earthquake Institute of Tokyo University.About 2 500 km(6 lines) field survey data were acquired successfully.According to the magnetic boundary strike diagram(MBSD) method proposed by Seama N et al.,the author analyzes these data and points out that the MBSD method can be used to express types of magnetic boundary synthetically and visibly.The author then conducts comparative analysis on the calculated result and the verified magnetic lineation of northern South China Sea basin and finds that they agree with each other very well.That study suggests that the MBSD method is useful when dealing with STCM data and studying marine magnetic structure.
引文
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[2]NAKASA Y.A Geophysical Study on the Rifting and Spreadi-ng of the South China Sea[D].Tokyo:Earthquake Research Institute,Univ of Tokyo,1995.
[3]KITAHARA Y,ISEZAKI N,KATAO H.Report on DELP 1984Cruises in the Middle Okinawa Trough,PartⅢ:Me-asurement of th Three Components of the Geomagnetic Fiel[R].Bull Earthq Res Inst Univ Tokyo,1986,61:203—249.
[4]FURUKAWA M,KONDO S,MIKI M,et al.Report on DELP1988 Cruises in the Okinawa Trough,Part 5:Meas-urement of the three components and Total Intensity of the Geomagnetic Field in the Okinawa Trough[R].Bull Earthq Res Inst UnivTokyo,1991,66:91—150.
[5]SEAMA N,ICHIKITA T,ISEZAKI N.Measurement of Three Component Geomagnetic Field by STCM:Preliminary Reportof the Hakuho Maru Cruise KH-89-1[R].1990:50—57.
[6]BLAKELY R J,COX A,IUFER E J.Vector Magnetic Da-ta for Detecting Short Polarity Internals in Marine Magneticprofiles[J].JGR,1973,78:6977—6983.
[7]ISEZAKI N.A new shipboard three component magnetometer[J].Geophysics,1986,51:1992—1998.
[8]ISEZAKI N,MATSUDA J,INOKUCHI H,et al.Shipboard Measurement of Three Components of Geomagnetic Field[J].J Geomag Geoelectr,1990,33:329—333.
[9]TIVEY M,JOHNSON H.The Central Anomaly Magnetic High:Implication for Ocean Crust Construction and Education[J].JGR,1987,92(B12):12685—12694.
[10]TAYLOR B,HAYES D E.Origin and History of the South China Sea Basin[J]//Hayes D E.The Tectonic and Geol-ogic Evolution of Southeast Asian Seas and Islands:Part 2,Geophysical Monograph Series.Washington:American Geop-hysical Union,1983,27:23—56.
[11]成都地质学院物探系.磁法勘探[M].北京:地质出版社,1976.
[12]中国科学院南海海洋研究所.南海地图[R].1981
[13]龚再生,李思田.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社,1997:12—26.
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