南海中北部OBS2006-3地震剖面中横波的识别与应用

doi:10.11978/j.issn.1009-5470.2010.05.072

Journal of Tropical Oceanography ›› 2010, Vol. 29 ›› Issue (5): 72-80.doi: 10.11978/j.issn.1009-5470.2010.05.072cstr: 32234.14.j.issn.1009-5470.2010.05.072

• Marine geophysics • Previous Articles Next Articles

Identification and application of shear waves along the profile OBS2006-3 in the mid-northern South China Sea

WEI Xiao-dong1,3, ZHAO Ming-hui1, RUAN Ai-guo2, QIU Xue-lin1, XIA Shao-hong1, ZHU Jun-jiang1, HUANG Hai-bo1,3

1. Key Laboratory of Marginal Sea Geology of CAS, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; 2. Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China; 3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2009-08-06 Revised:2009-09-21 Online:2010-10-30 Published:2011-10-10
Contact: 赵明辉(1967—), 女, 辽宁省锦州市人, 副研究员, 主要从事海洋地球物理研究。 E-mail:mhzhao@scsio.ac.cn
About author:卫小冬(1984—), 男, 河南省新安县人, 硕士研究生, 主要从事海洋地球物理研究。E-mail: richild@126.com
Supported by:
科技部“973”项目(2007CB411701); 国家自然科学基金(40876035; 40776025); 中国科学院南海海洋研究所领域前沿项目
(LYQY200704); 广东省自然科学基金(07004190); 中国科学院知识创新工程(KZCX2-YW-Q05-04)

Abstract

Abstract:

Applying the joint exploration of P-wave and S-wave, the complex subsurface crustal structure can be obtained. The association of P-wave velocity and S-wave velocity is very sensitive to the physical state of rocks, and is thus very useful in lithological studies. Compared with travel-time of P-wave and S-wave, apparent velocity and particle’s moving trajectory in vertical-component and radical-component seismic sections, converted S-wave phases were identified in OBS8 and OBS10 along the profile OBS2006-3 in the mid-northern South China Sea. In this paper, taking these two OBSs as examples, we discussed identification and analysis of converted S-waves in detail. A few of S-wave seismic phases (e.g., PwSs3, PgSs3, PmS) were identified based on the optimum P-wave model using the software Rayinvr and the ratio of Vp/Vs and Poisson’s ratio are calculated beneath these two OBSs stations. Based on P-wave velocity (VP=7.20?7.25km•s−1), S-wave velocity (VS= 4.20?4.23km•s−1) and Poisson’s ratio (0.24), we suggest that the high velocity layer in the lower crust has a mafic composition that may originate from magmatic underplating.

Key words: ocean bottom seismometer (OBS), converted S-wave, VP/VS ratio, the mid-northern South China Sea

WEI Xiao-dong,ZHAO Ming-hui,RUAN Ai-guo,QIU Xue-lin,XIA Shao-hong,ZH. Identification and application of shear waves along the profile OBS2006-3 in the mid-northern South China Sea[J].Journal of Tropical Oceanography, 2010, 29(5): 72-80.

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Identification and application of shear waves along the profile OBS2006-3 in the mid-northern South China Sea

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