南海中北部地壳深部结构探测新进展
摘要
2006年8～10月间,国家海洋局第二海洋研究所使用德国SEDIS型三分量海底地震仪以气枪为震源在南海中北部开展了广角地震反射/折射勘测,这是我国大陆科研单位第一次自主开展长距离多剖面的海底地震仪人工地震探测。勘测线共三条,总长达1176.8km,工区最大水深4137m,共投放48台次,回收成功率95.8%。所获得的数据质量良好,深部信息丰富,可直观地分辨出Pg、Pn、PmP等震相,为南海中北部深部地壳结构、洋壳与陆壳分界和西北、西南次海盆的形成演化研究提供了重要的依据。
The Second Institute of Oceanography, State Oceanic Administration (SOA), has just successfully carried out a marine survey from Aug. to Oct. in 2006 for deep crust structure sounding in the mid-northern South China Sea (SCS), which is the first time for Chinese mainland scientists to use ocean bottom seismometer (OBS) for sounding long distance multi-profiles independently. In this active wide angle seismic reflection and refraction profiling survey, 15 sets of three-component Germany SEDIS IV OBS were used with air gun array as the seismic source. Three profiles with a total length of 1176.8 km were sounded in the area and the largest water depth reaches 4137 m. Totally 48 OBS stations were deployed with a recovering rate of 95.8% for the three profiles. The obtained seismic records have a high quality, containing various kinds of seismic signals from deep crust structure and Moho discontinuity. Various seismic phases, such as Pg, Pn and PmP, can be distinguished directly from the records. It is believed that the data obtained from this cruise would play an important role in the investigation of deep crust structure of mid-northern SCS, continental and oceanic crust mapping in SCS as well as evolution of north-western and south-western sub-basins of SCS.
The Second Institute of Oceanography, State Oceanic Administration (SOA), has just successfully carried out a marine survey from Aug. to Oct. in 2006 for deep crust structure sounding in the mid-northern South China Sea (SCS), which is the first time for Chinese mainland scientists to use ocean bottom seismometer (OBS) for sounding long distance multi-profiles independently. In this active wide angle seismic reflection and refraction profiling survey, 15 sets of three-component Germany SEDIS IV OBS were used with air gun array as the seismic source. Three profiles with a total length of 1176.8 km were sounded in the area and the largest water depth reaches 4137 m. Totally 48 OBS stations were deployed with a recovering rate of 95.8% for the three profiles. The obtained seismic records have a high quality, containing various kinds of seismic signals from deep crust structure and Moho discontinuity. Various seismic phases, such as Pg, Pn and PmP, can be distinguished directly from the records. It is believed that the data obtained from this cruise would play an important role in the investigation of deep crust structure of mid-northern SCS, continental and oceanic crust mapping in SCS as well as evolution of north-western and south-western sub-basins of SCS.
引文
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[3]何廉声,陈邦彦.南海地质构造图、南海地质地球物理图集[M].广州:广东地图出版社,1987.
[4]金翔龙.南海地球科学研究报告[J].东海海洋,1989,7(4):21-29.
[5]任纪瞬.中国东部及邻区大陆岩石圈的构造演化与成矿[M].北京:科学出版社,1990.
[6]刘光鼎.中国海区及邻域地质地球物理系列图及说明书(1:500万)[M].北京:地质出版社,1992.
[7]姚伯初.南海海盆在新生代的构造演化[J].南海地质研究,1991,3:9-23.
[8]Ludwig W.J.et al.,Sediments and structure of the Japan Sea[J].Geol.Soc.Amer.Bull,1975,88:651-664.
[9]Yan,P.,Zhou,D.,Liu,Z.S.A crustal structure profile across the northern continental margin of the South China Sea[J].Tectonophysics,2001,338(1):1-21.
[10]李家彪.南海东部海盆的张裂特征及扩张方式研究[D].中国科学院,2001.
[11]李家彪.“中国边缘海的形成演化及重要资源的关键问题”973项目结题总结报告[R],杭州:国家海洋局第二海洋研究所,2005.
[12]丘学林,施小斌,阎贫,等.南海北部地壳结构的深地震探测和研究新进展[J].自然科学进展,2003,(3):231-236.
[13]阎贫,刘昭蜀,姜绍人.南海北部地壳的深地震地质结构探测[J].海洋地质与第四纪地质,1997,17(2):21-27.
[14]Nakamura,Y.,McIntosh,K.,Chen,A.T.Preliminary results of a large offset seismic survey west of Hengchun Peninsula,sourthern Taiwan[J].TAO,1998,9(3):359-408.
[15]Qiu,X..,Ye,S.,Wu,S.,Shi,X.,Zhou,D.,Xia,K.,Flue,E.R.,Crustal structure across the Xisha Trough,northwestern South China Sea[J].Tectonophysics,2001,341:179-193.
[16]Wang,Tan.K.,Ming-Kai.Chen,Chao-Shing Lee et al.Seismic imaging of the transitional crust across the northeastern margin of the South China Sea[J].Tectonophysics,2006,412:237-254.
[17]游庆瑜,刘福田,冉崇荣,等.高频微功耗海底地震仪研制[J],地球物理学进展,2003,.18(1):173-176.
[18]李湘云,吴振利,薛彬,等.SEDIS IV型短周期自浮式海底地震仪及应用体会[J].热带海洋学报,2007,26(5):35-39.
[19]Cohen Jack K.,Stockwell John W..The SU user's manual[M].Colorado School of Mines,Chicago,USA.1995.
[20]Makris,J.and Thie?en,J.,Wide-Angle Reflections:a Tool to Penetrate Horizons with High Acoustic Impedance Contrasts[C].Exp.Abstr.,SEG54th annual meeting,Atlanta.1984.
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