马尼拉海沟俯冲带前缘(21°N)海底地震仪数据处理初步成果*

doi:10.11978/2016058

热带海洋学报 ›› 2017, Vol. 36 ›› Issue (2): 60-69.doi: 10.11978/2016058CSTR: 32234.14.2016058

所属专题：海洋大数据及应用

马尼拉海沟俯冲带前缘(21°N)海底地震仪数据处理初步成果^*

刘思青^1,³(), 赵明辉¹(), 张佳政¹, 孙龙涛¹, 徐亚², 詹文欢¹, 丘学林¹

1. 中国科学院边缘海地质重点实验室, 中国科学院南海海洋研究所, 广东广州 510301
2. 中国科学院油气资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029
3. 中国科学院大学, 北京 100049

收稿日期:2016-06-16 修回日期:2016-08-30 出版日期:2017-03-20 发布日期:2017-04-06
作者简介:
作者简介：刘思青(1990—), 女, 黑龙江省哈尔滨市人, 博士研究生, 主要从事海洋地球物理研究。E-mail: sqliu@scsio.ac.cn
基金资助:
国家自然科学基金项目(91428204、41376063、41449908、41576070);国家自然科学基金委员会共享航次(航次编号: NORC2015-08)和中国科学院战略性先导科技专项(B类)(XDB06030202)

OBS seismic data processing of the Manila Trench subduction zone (21°N) and some preliminary results

Siqing LIU^1,³(), Minghui ZHAO¹(), Jiazheng ZHANG¹, Longtao SUN¹, Ya XU², Wenhuan ZHAN¹, Xuelin QIU¹

1. Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2. Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2016-06-16 Revised:2016-08-30 Online:2017-03-20 Published:2017-04-06
Supported by:
Natural Science Foundation of China (91428204, 41376063, 41449908, 41576070);Natural Science Foundation of China Open Research Cruise (NORC2015-08);Strategic Priority Research Program of the Chinese Academy of Science (XDB06030202 )

摘要/Abstract

摘要：

在马尼拉海沟俯冲带前缘开展了二维海底地震仪(OBS)探测实验, 布置了一条东西走向的深地震测线—— OBS2015-2。以该测线上的2个台站(OBS04和OBS08)为例, 阐述了此次实验所用短周期国产OBS的数据处理流程。包括从原始数据到SAC格式、再到SEGY格式的转换; 同时包括炮点位置校正和OBS位置校正。数据处理结果表明, OBS2015-2测线的数据质量良好, 综合地震剖面显示来自深部的震相(如PsP、Pg、PmP等)信息十分清晰。利用Rayinvr软件正演试算, 进一步确认了震相类型, 特别是来自于输入板块莫霍面的反射震相非常丰富, 为马尼拉俯冲带的输入板块地壳底界面的确定提供了重要的数据基础。

关键词: 海底地震仪, 震相拾取, 马尼拉海沟俯冲带, 数据处理

Abstract:

A two-dimensional ocean bottom seismometer (OBS) survey line (OBS2015-2) was carried out in 2015, which was an E-W trending and located in the front of the Manila Trench subduction zone. In this study, we take two OBS stations (OBS04 and OBS08) as examples to introduce the data processing flow for this short-period OBS type of data. The process includes data format transforming from original RAW data to SAC format and then to SEGY format; and it contains shot relocation and OBS position relocation. The preliminary results of data processing demonstrate that the OBS data are of high quality in this experiment. The seismic phases, such as PsP, Pg, PmP, etc. are very clear along the OBSs’ seismic record sections. They are further identified by the forward modeling using the Rayinvr software. Especially, the reflective seismic phases from the Moho interface are abundant and obvious in the incoming plate along the Manila Trench subduction zone, which will provide good constraints for the crustal bottom of the incoming plate.

Key words: ocean bottom seismometer (OBS), seismic phase picking, the Manila Trench subduction zone, data processing

中图分类号:

P738

刘思青, 赵明辉, 张佳政, 孙龙涛, 徐亚, 詹文欢, 丘学林. 马尼拉海沟俯冲带前缘(21°N)海底地震仪数据处理初步成果^*[J]. 热带海洋学报, 2017, 36(2): 60-69.

Siqing LIU, Minghui ZHAO, Jiazheng ZHANG, Longtao SUN, Ya XU, Wenhuan ZHAN, Xuelin QIU. OBS seismic data processing of the Manila Trench subduction zone (21°N) and some preliminary results[J]. Journal of Tropical Oceanography, 2017, 36(2): 60-69.

图/表 10

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OBS站位	回收点位置		校正后位置		V_w /(km·s^-1)	校正后水深/km	单道水深/km	RMS/s	偏移距 /km
OBS站位	东经/º	北纬/º	东经/º	北纬/º	V_w /(km·s^-1)	校正后水深/km	单道水深/km	RMS/s	偏移距 /km
01	118.69265	21.00089	118.69188	21.00094	1.500	2605.69	2625.75	0.005	0.0801
02	118.83431	21.00134	—	—	—	—	—	—	—
03	118.98173	21.00177	118.98016	21.00130	1.502	2680.61	2704.50	0.019	0.1668
04	119.12634	21.00227	119.12363	21.00101	1.506	2723.99	2755.50	0.007	0.3113
05	119.27071	21.00244	119.26883	21.00141	1.483	2857.85	2809.50	0.011	0.2224
06	119.41483	21.00222	119.41351	21.00420	1.500	2930.82	2958.75	0.009	0.2557
07	119.70419	21.00212	119.70301	21.00114	1.502	3193.43	3213.75	0.007	0.1668
08	119.84892	21.00189	119.84903	21.00217	1.499	3418.00	3399.00	0.006	0.0332
09	119.99337	21.00018	119.99345	21.00204	1.500	3615.60	3660.75	0.009	0.2113

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马尼拉海沟俯冲带前缘(21°N)海底地震仪数据处理初步成果^*

OBS seismic data processing of the Manila Trench subduction zone (21°N) and some preliminary results

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