庞新明^1,3,,
赵明辉^1,3,,,
刘思青²,
王强^1,3,
张浩宇^1,3,
任昱^1,3,
丘学林^1,3
1. 中国科学院边缘海与大洋地质重点实验室, 中国科学院南海海洋研究所, 广州 510301
2. 广州海洋地质调查局, 广州 510760
3. 中国科学院大学, 北京 100049

基金项目: 国家自然科学基金重大研究计划（91428204，91958212），国家自然科学基金项目（41730532，41576070，41376063，41676043）联合资助


详细信息

作者简介: 庞新明, 女, 1990年生, 黑龙江省绥化市人, 在读博士研究生, 研究方向为海洋深部地球物理.E-mail:xmpang@scsio.ac.cn

通讯作者: 赵明辉, 女, 1967年生, 辽宁省锦州市人, 研究员, 博士, 主要从事海洋地球物理与深部结构研究.E-mail:mhzhao@scsio.ac.cn

中图分类号: P738

收稿日期:2018-07-23
修回日期:2018-09-26
上线日期:2019-09-05

Seismic phases identification in OBS seismic record sections across the complex geological structure

PANG XinMing^1,3,,
ZHAO MingHui^1,3,,,
LIU SiQing²,
WANG Qiang^1,3,
ZHANG HaoYu^1,3,
REN Yu^1,3,
QIU XueLin^1,3
1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2. Guangzhou Marine Geological Survey, Guangzhou 510760, China
3. University of Chinese Academy of Sciences, Beijing 100049, China


More Information

Corresponding author: ZHAO MingHui,E-mail:mhzhao@scsio.ac.cn

MSC: P738

--> Received Date: 23 July 2018
Revised Date: 26 September 2018
Available Online: 05 September 2019


摘要
摘要:震相识别对获取深部速度结构至关重要.横穿加瓜海脊的T1测线东段，地形高差达3 km，沉积厚度相差约2 km，沉积基底变化复杂，对海底地震仪（OBS）地震剖面的震相识别增加了难度.本文以该测线东段OBS数据为例，采用地形校正、基底校正、多次波识别、正演模拟、走时投影等多种手段，开展了复杂构造的OBS震相识别研究，获得了测线下方深部速度结构模型.结果表明，采用的方法对复杂地质结构下OBS震相识别是行之有效的，相比传统的方法提供了更多且准确的震相走时信息，获得的速度模型更加可靠.
关键词: 震相识别/
海底地震仪/
地形校正/
基底校正/
多次波识别

Abstract:Phase identification plays a critical role in modeling the deep velocity structure. The geological structure is complex along the east part of Line T1 across the Gagua Ridge since its topography of sea bottom reaching 3 km in height and the sediment arriving at about 2 km in thickness. As a result,it is difficult to identify seismic phase in Ocean Bottom Seismometer (OBS) seismic record sections. In this paper,we adopt many methods including topographic correction,basement correction,multiple wave identification,forward modeling and travel time projection,and build a set of measures about phase identification for the complex geologic structure taking the OBS data along the east part of Line T1 as examples. The results show that these technical measures of phase identification are useful and effective for OBS data along the complex geological structure,which offers much more accurate travel-time information and obtains more reliable deep velocity structure.
Key words:Phase identification/
Ocean bottom seismometer (OBS)/
Topographic correction/
Basement correction/
Multiple wave identification



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