Analysis on deep crustal structure along the onshore-offshore seismic profile across the Binhai (littoral) fault zone in northeastern South China Sea

被引:0
|
作者
Zhao, MH [1 ]
Qiu, XL
Ye, CM
Xia, KY
Huang, CL
Xie, JB
Wang, P
机构
[1] Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
[2] Chinese Acad Sci, Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Peoples R China
来源
关键词
northeastern South China Sea; onshore-offshore deep seismic experiment; Binhai(littoral) fault zone; crustal structure; low-velocity layer;
D O I
暂无
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The onshore-offshore deep seismic experiment was carried out for the first time and filled the blankness of the seismic surveys in the transition area between South China and northeastern South China Sea. The seismic data were analyzed and processed. The different seismic phases were identified and their travel time arrivals were modeled by ray-tracing to study the P-wave velocity crustal structure of this area. The crustal structure of this area is the continental crust. The crust thickness is gradually decreasing southward along the on-shore-offshore seismic line. The low-velocity layer (5.5 similar to 5.9 km (.) s(-1)) exists generally in the middle crust (about 10.0 similar to 18.0km)with about 2.5 similar to 4.0 km thickness, which is also thinning seaward. No obvious high-velocity layer appears in the lower crust. The Binhai (littoral) fault zone is a low velocity zone, which is located about 35km southeast to the Nan'ao station and corresponding to the gradient belt of gravity & magnetism anomalies. The depth of the fault zone is close to the Moho discontinuity. The littoral fault zone is a boundary between the normal continental crust of South China and the thinned continental crust of the sea area.
引用
收藏
页码:845 / 852
页数:8
相关论文
共 25 条
  • [1] Velocity structure beneath the eastern offshore region of southern Taiwan based on OBS data
    Chen, AT
    Nakamura, Y
    [J]. TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES, 1998, 9 (03): : 409 - 424
  • [2] Gong Z., 1997, Continental margin basin analysis and hydrocarbon accumulation of the northern South China sea
  • [3] GU ZJ, 1995, SCI CHINA SER B, V25, P108
  • [4] THROUGHGOING CRUSTAL FAULTS ALONG THE NORTHERN MARGIN OF THE SOUTH-CHINA-SEA AND THEIR ROLE IN CRUSTAL EXTENSION
    HAYES, DE
    NISSEN, SS
    BUHL, P
    DIEBOLD, J
    YAO, BC
    ZENG, WJ
    CHEN, YQ
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 1995, 100 (B11) : 22435 - 22446
  • [5] Structural evolution from Paleogene extension to Latest Miocene-Recent arc-continent collision offshore Taiwan: comparison with on land geology
    Huang, CY
    Xia, KY
    Yuan, PB
    Chen, PG
    [J]. JOURNAL OF ASIAN EARTH SCIENCES, 2001, 19 (05) : 619 - 639
  • [6] Li T. G., 1992, GEOLGOIC GEOPHYSICS, P248
  • [7] Liao Qi-Lin, 1988, Acta Geophysica Sinica, V31, P270
  • [8] LU YX, 1994, NEOTECTONICS CRUSTAL, P85
  • [9] Preliminary results of a large offset seismic survey west of Hengchun Peninsula, southern Taiwan
    Nakamura, Y
    McIntosh, K
    Chen, AT
    [J]. TERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCES, 1998, 9 (03): : 395 - 408
  • [10] LARGE-OFFSET SEISMIC SURVEYING USING OCEAN-BOTTOM SEISMOGRAPHS AND AIR GUNS - INSTRUMENTATION AND FIELD TECHNIQUE
    NAKAMURA, Y
    DONOHO, PL
    ROPER, PH
    MCPHERSON, PM
    [J]. GEOPHYSICS, 1987, 52 (12) : 1601 - 1611