南海北部陆缘OBS2018-H2测线地壳结构初步结果*

doi:10.11978/2020131

热带海洋学报 ›› 2021, Vol. 40 ›› Issue (5): 111-122.doi: 10.11978/2020131CSTR: 32234.14.2020131

南海北部陆缘OBS2018-H2测线地壳结构初步结果^*

苏晓康^1,³(), 赵明辉^1,^2,³(), 李子正^1,³, 袁野^1,³, 王星月^1,³, 程锦辉^1,³, 张佳政^1,²

1.中国科学院边缘海与大洋地质重点实验室(南海海洋研究所), 南海生态环境工程创新研究院, 广东广州 510301
2.南方海洋科学与工程广东省实验室(广州), 广东广州 511458
3.中国科学院大学, 北京 100049

收稿日期:2020-11-10 修回日期:2021-01-04 出版日期:2021-09-10 发布日期:2021-01-08
通讯作者: 赵明辉
作者简介:苏晓康(1995—), 男, 河南省开封市人, 硕士研究生, 研究方向为海洋地球物理。email: suxiaokang@scsio.ac.cn
基金资助:
国家自然科学基金(41730532);国家自然科学基金(91958212);国家自然科学基金(42002222);国家自然科学基金(91858212);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0204)(GML2019ZD0204);广东省自然科学基金团队项目(2017A030312002)

Preliminary results of the crustal structure along OBS2018-H2 in the northern continental margin of the South China Sea^*

SU Xiaokang^1,³(), ZHAO Minghui^1,^2,³(), LI Zizheng^1,³, YUAN Ye^1,³, WANG Xingyue^1,³, CHENG Jinhui^1,³, ZHANG Jiazheng^1,²

1. CAS Key Laboratory of Ocean and Marginal Sea Geology (South China Sea Institute of Oceanology), Innovation Academy of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China
2. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2020-11-10 Revised:2021-01-04 Online:2021-09-10 Published:2021-01-08
Contact: ZHAO Minghui
Supported by:
Natural Science Foundation of China(41730532);Natural Science Foundation of China(91958212);Natural Science Foundation of China(42002222);Natural Science Foundation of China(91858212);Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2019ZD0204);Guangdong Natural Science Foundation research team project(2017A030312002)

摘要/Abstract

摘要：

南海北部陆缘洋陆转换带实施的OBS2018-H2测线的地壳速度结构, 将为探讨南海张裂-破裂机制提供重要证据。文章介绍了OBS2018-H2测线前期数据处理流程, 包括多道反射地震数据处理、海底地震仪OBS (Ocean Bottom Seismometer)数据格式转换、炮点和OBS位置校正, 以及OBS震相的初步识别, 并对地壳结构进行了初步分析。结果表明: 炮点和OBS位置校正效果良好; 多道反射地震数据为建立初始速度模型提供了良好约束; OBS综合地震剖面识别了多组清晰的P波震相, 包括Pw、Pg、PmP和Pn震相。根据测线西侧OBS36、OBS37两台站的震相分布特征初步估算台站下方地壳厚度约为6~7km, 与根据多道地震剖面LW3的双程走时估算的厚度6~9km大致相符。

关键词: 数据处理, 震相, 初始速度模型, 地壳厚度, 洋陆转换带, 南海北部陆缘

Abstract:

The crustal velocity structure along profile OBS2018-H2 located in the continent-ocean transition can provide important evidence for the rifting-breakup mechanism of the northern margin of the South China Sea (SCS). The preliminary data processing steps are presented in this paper, including multi-channel reflective data processing, OBS (Ocean Bottom Seismometer) data format conversion, shot and OBS relocation, and identification of OBS seismic phases, followed by a preliminary analysis of the crustal structure. Our results show that relocations of shots and OBSs are effective and reliable. The multi-channel seismic (MCS) profile provides a good constraint for building the initial velocity model. Several groups of seismic phases, e.g., Pg, PmP and Pn, are clearly identified in OBS comprehensive seismic profiles. Based on the distribution characteristics of the OBS36 and OBS37 seismic phases on the west side of OBS2018-H2, the thickness of the crust below these two stations is estimated to be about 6 ~ 7 km. It is roughly equivalent to the thickness of 6 ~ 9 km estimated from the two-way travel time in MCS profile LW3.

Key words: data processing, seismic phase, initial velocity model, crustal thickness, continent-ocean transition, northern margin of South China Sea

中图分类号:

P712.83

苏晓康, 赵明辉, 李子正, 袁野, 王星月, 程锦辉, 张佳政. 南海北部陆缘OBS2018-H2测线地壳结构初步结果^*[J]. 热带海洋学报, 2021, 40(5): 111-122.

SU Xiaokang, ZHAO Minghui, LI Zizheng, YUAN Ye, WANG Xingyue, CHENG Jinhui, ZHANG Jiazheng. Preliminary results of the crustal structure along OBS2018-H2 in the northern continental margin of the South China Sea^*[J]. Journal of Tropical Oceanography, 2021, 40(5): 111-122.

图/表 10

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OBS 编号	投放位置		校正后位置		校正后水深/m	海水声速/(m·s^-1)	漂移距离/m	RMS /ms
OBS 编号	东经/(°)	北纬/(°)	东经/(°)	北纬/(°)	校正后水深/m	海水声速/(m·s^-1)	漂移距离/m	RMS /ms
09	116.45648	18.48332	116.45343	18.48297	3800.2	1501.4	324.8	3.4
25	115.88451	18.41252	115.88423	18.41135	3768.7	1501.3	131.9	4.8
36	115.75399	18.39623	115.75665	18.39637	3766.2	1503.1	281.8	3.5
37	116.01618	18.42904	116.01979	18.42997	3762.6	1500.1	394.2	4.4
38	116.13817	18.44404	116.14042	18.44650	3763.0	1501.1	361.5	3.3
39	116.23545	18.45643	116.23679	18.45858	3772.5	1500.2	277.6	4.7
40	116.32148	18.46648	116.32100	18.46810	3781.6	1500.2	185.6	3.8
41	116.55881	18.49536	116.55592	18.49517	3813.9	1498.1	305.6	4.7
42	116.66120	18.50772	116.65918	18.50749	3837.5	1500.3	214.6	2.1
43	116.76341	18.52016	116.76122	18.51933	3871.1	1499.1	248.5	3.7

南海北部陆缘OBS2018-H2测线地壳结构初步结果^*

Preliminary results of the crustal structure along OBS2018-H2 in the northern continental margin of the South China Sea^*

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南海北部陆缘OBS2018-H2测线地壳结构初步结果*

Preliminary results of the crustal structure along OBS2018-H2 in the northern continental margin of the South China Sea*

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南海北部陆缘OBS2018-H2测线地壳结构初步结果^*

Preliminary results of the crustal structure along OBS2018-H2 in the northern continental margin of the South China Sea^*