Marine geomorphology

OBS seismic data processing and preliminary results on the hydrothermal field of the Southwest Indian Ridge

  • ZHANG Jia-Zheng ,
  • DIAO Meng-Hui ,
  • QIU Hua-Lin ,
  • Ruan-Ai-Guo ,
  • LI Jia-Biao ,
  • CHEN Yong-Shun ,
  • AO Wei ,
  • WEI Xiao-Dong
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  • 1. Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
    2. Second Institute of Oceanography, SOA, Hangzhou 310012, China;
    3. Computational Geodynamics Laboratory, Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China;
    4. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2011-10-25

  Revised date: 2011-12-26

  Online published: 2012-09-11

Abstract

Three-dimensional (3D) ocean bottom seismometer (OBS) survey provides a significant foundation for the deep crustal and upper mantle structure of the hydrothermal field (49°39′E) (Area A) in the Southwest Indian Ridge. OBS data processing is the basic step of obtaining the 3D seismic velocity structure. The flow steps for data processing of three types of OBS (domestic, French and Germanic OBS) were firstly introduced, containing the decompilation, cutting and seismic signal visualization. Taking the shot 2790th for example, waveforms and frequency spectrums of three types of OBSs were then analyzed, which were related to frequency band, sensor and seismograph for different OBSs. Domestic and French OBSs recorded long-periodic and short-periodic noises, and Germanic OBS only recorded short-periodic noises. However, air-gun signals were highlighted and noises were suppressed for all the OBSs after using a band-passed filter. Moreover, several seismic phases, e.g., Pg, PmP and Pn, were clearly revealed in the recorded seismic sections of three types of OBSs (OBS04, OBS08 and OBS23) along the profile X1X2. These phases will provide a strong data base for 3D tomography for studying Area A.

Cite this article

ZHANG Jia-Zheng , DIAO Meng-Hui , QIU Hua-Lin , Ruan-Ai-Guo , LI Jia-Biao , CHEN Yong-Shun , AO Wei , WEI Xiao-Dong . OBS seismic data processing and preliminary results on the hydrothermal field of the Southwest Indian Ridge[J]. Journal of Tropical Oceanography, 2012 , 31(3) : 79 -89 . DOI: 10.11978/j.issn.1009-5470.2012.03.011

References

[1] DICK H J B, LIN J, SCHOUTEN H. An ultraslow-spreading class of ocean ridge [J]. Nature, 426(27): 405-412.

[2] MENDEL V, SAUTER D, PARSON L, et al. Segmentation and morphotectonic variations along a super slow-spreading center: the Southwest Indian Ridge (57°E-70°E) [J]. Marine Geophysical Researches, 1997, 19: 505-533.

[3] CANNAT M, ROMMEVAUX-JESTIN C, SAUTER D, et al. Formation of the axial relief at the very slow spreading Southwest Indian Ridge(49°to 69°E) [J]. Journal of Geophysical Research, 1999, 104: 22825-22843.

[4] CANNAT M, SAUTER D, MENDEL V, et al. Modes of seafloor generation at a melt-poor ultraslow-spreading ridge [J]. Geology, 2006, 34(7): 605-608.

[5] SAUTER D, PATRIAT P, ROMMEVAUX-JESTIN C, et al. The Southwest Indian Ridge between 49°15?E and 57°E: Focused accretion and magma redistribution [J]. Earth and Planetary Science Letter, 2001, 192: 303–317.

[6] PATRIAT P, SAUTER D, MUNSCHY M, et al. A survey of the Southwest Indian Ridge axis between Atlantis II fracture zone and the Indian Ocean triple junction: Regional setting and large scale segmentation [J]. Marine Geophysical Researches, 1997, 19: 457-480.

[7] MENDEL V, SAUTER D, ROMMEVAUX-JESTIN C, et al. Magmato-tectonic cyclicity at the ultra-slow spreading Southwest Indian Ridge: Evidence from variations of axial volcanic ridge morphology and abyssal hills pattern [J]. Geochemistry Geophysics Geosystems, 2003, 4(5): 1-23.

[8] GOMEZ O, BRIAIS A, SAUTER D, et al. Tectonics at the axis of the very slow spreading Southwest Indian Ridge: Insights from TOBI side-scan sonar imagery [J]. Geochemistry Geophysics Geosystems, 2006, 7:1-24.

[9] ROMMEVAUX-JESTIN C, DEPLUS C, PATRIAT P. Mantle Bouguer Anomaly along an ultra slow spreading ridge: implications for accretionary process and comparison with results from central Mid-Atlantic Ridge [J]. Marine Geophysical Researches, 1997, 19: 481-503.

[10] GRINDLAY N R, MADSEN J A, ROMMEVAUX-JESTIN C, et al. A different pattern of ridge segmentation and mantle Bouguer gravity anomalies along the ultra-slow spreading Southwest Indian Ridge (15°30E-70°E) [J]. Earth and Planetary Science Letters, 1998, 161: 243-253.

[11] GEORGEN J E, LIN J, DICK H J B. Evidence from gravity anomalies for interactions of the Marion and Bouvet hotspots with the Southwest Indian Ridge: effects of transform offsets [J]. Earth and Planetary Science Letters, 2001, 187: 283-300.

[12] SAUTER D., CANNAT M., MEYZEN C., et al. Propagation of a melting anomaly along the ultraslow Southwest Indian Ridge between 46°E and 52°20'E: interaction with the Crozet hotspot? [J]. Geophysical Journal International, 2009, 179(2): 687-699.

[13] HOSFORD A, TIVEY M, MATSUMOTO T, et al. Crustal magnetization and accretion at the Southwest Indian Ridge near the Atlantis II fracture zone, 0-25 Ma [J]. Journal of Geophysical Research, 2003, 108: 1-23.

[14] MULLER M R, ROBINSON C J, MINSHULL T A, et al. Thin crust beneath borehole 735B at the Southwest Indian Ridge? [J]. Earth and Planetary Science Letters, 1997, 148: 93-107.

[15] MINSHULL T A, MULLER M R, WHITE R S. Crustal structure of the Southwest Indian Ridge at 66°E: Seismic constraints [J]. Geophysical Journal International, 2006, 166: 135-147.

[16] GERMAN C R, BAKER E T, MEVEL C, et al. Hydrothermal activity along the southwest Indian ridge [J]. Nature, 1998, 395(6701): 490-493.

[17] TAO C H, LIN J, GUO S, et al. Discovery of the first active hydrothermal vent field at the ultraslow spreading Southwest Indian Ridge [J]. InterRidge News, 2007, 16: 25-26.

[18] GEORGEN J E, KURZ M D, DICK H J B, et al. Low He-3/He-4 ratios in basalt glasses from the western Southwest Indian Ridge (10 degrees-24 degrees E) [J]. Earth and Planetary Science Letters, 2003, 206(3-4): 509-528.

[19] COOGAN L A, THOMPSON G M, MACLEOD C J, et al. A combined basalt and peridotite perspective on 14 million years of melt generation at the Atlantis Bank segment of the Southwest Indian Ridge: evidence for temporal changes in mantle dynamics? [J]. Chemical Geology, 2004, 207(1-2): 13-30.

[20] LIN J, ZHANG C. The first collaborative China- International cruises to investigate Mid-Ocean ridge hydrothermal vents [J]. Ridge Crest News, 2006, 15:33-34.

[21] ZHU J, LIN J, CHEN Y S, et al. A reduced crustal magnetization zone near the first observed active hydrothermal vent field on the Southwest Indian Ridge [J]. Geophysical Research Letters, 2010, 37: 1-5.

[22] THOMPSON G, HUMPHRIS S E, SCHROEDER B, et al. Active vents and massive sulfides at 26°N (TAG) and 23°N (Snakepit) on the Mid-Atlantic Ridge [J]. Canadian Mineral, 1988, 26: 697-711.

[23] TIVEY M K, HUMPHRIS S E, THOMPSON G, et al. Deducing patterns of fluid flow and mixing within the active TAG mound using mineralogical and geochemical data [J]. Journal of Geophysical Research, 1995, 100(12): 527-556.

[24] 赵明辉, 丘学林, 李家彪, 等. 慢速、超慢速扩张洋中脊三维地震结构研究进展与展望[J]. 热带海洋学报, 2010, 29(6): 1-7.

[25] 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进展[J]. 自然科学进展, 2003, 13(3): 231-236.

[26] 赵明辉, 丘学林, 夏少红, 等. 大容量气枪震源及其波形特征[J]. 地球物理学报, 2008, 51(2): 558-565.

[27] 敖威, 赵明辉, 丘学林, 等. 西南印度洋中脊三维地震探测中炮点与海底地震仪的位置校正[J]. 地球物理学报, 2010, 53(12): 2982-2991.

[28] BARRY K M, CAVERS D A, KNEALE C W. Recommended standards for digital tape formats [J]. Geophysics, 40(2): 344-352.

[29] FORSYTH D, DETRICK B. Ocean Mantle Dynamics Science Plan [R]. Woods Hole Oceanographic Institution, 2000: l-36.

[30] 阮爱国, 李家彪, 冯占英, 等. 海底地震仪及其国内外发展现状[J]. 东海海洋, 2004, 22(2): 19-27.

[31] 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.

[32] 邵安民, 张玉云, 赵风文. 海底地震数据记录器[J]. 地球物理学报, 2003, 46(2): 224-228.

[33] 王嘹亮, 张志荣, 阎贫, 等.潮汕坳陷地壳结构探测初步成果[J]. 南海地质研究, 2003, 15: 62-67.

[34] 阮爱国, 李家彪, 陈永顺, 等. 国产I-4C型OBS在西南印度洋中脊的试验[J]. 地球物理学报, 2010, 53(4): 1015-1018.

[35] 王芳. 国产海底地震仪产业化之路——海底流动地震观测台阵研发记[J]. 中国发明与专利, 2011, 4: 105-107.

[36] 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): 735-39.

[37] WILLIAM C T, JOSEPH E T.SAC-Seismic Analysis Code USERS MANUAL [M]. Lawrence Livermore National Laboratory, Livermore, CA, 1991:1-153.

[38] COHEN J K, STOCKWELL J W. The SU user’s manual [R]. Colorado School of Mines, 1995: 1-40.

[39] 赵明辉, 丘学林, 夏戡原, 等. 南海东北部海陆联测地震数据处理及初步结果[J]. 热带海洋学报, 2004, 23(1): 58-63.

[40] 敖威, 赵明辉, 阮爱国, 等. 利用海底地震仪数据分析台风对海底环境噪音的影响[J]. 热带海洋学报, 2009, 28(6): 61-67.

[41] 刘宏扬, 牛雄伟, 阮爱国, 等. 海底地震仪实测信号特性分析[J]. 热带海洋学报, 2012, 31(3):90-96.
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