热带海洋学报 ›› 2017, Vol. 36 ›› Issue (3): 80-85.doi: 10.11978/2016076

• • 上一篇    下一篇

珠江口区域海陆联合三维地震构造探测的数据处理与震相识别*

吕作勇1,2,4(), 丘学林1,4(), 叶春明2, 孙金龙1, 段永红3, 吕金水2   

  1. 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), 广东 广州 510301
    2. 广东省地震局, 中国地震局地震监测与减灾技术重点实验室, 广东省地震预警与重大工程安全诊断重点实验室, 广东 广州 510070
    3. 中国地震局地球物理勘探中心, 河南 郑州, 450002
    4. 中国科学院大学, 北京 100049;
  • 收稿日期:2016-08-11 修回日期:2016-09-29 出版日期:2017-05-20 发布日期:2017-06-01
  • 作者简介:

    作者简介:吕作勇(1984—), 男, 江西省信丰县人, 在读博士, 主要从事地震监测和深部结构研究。E-mail: 154471897@qq.com

  • 基金资助:
    地震科技星火计划项目(XH16029Y);国家自然基金面上项目(41676057、41674092);广东省局合作项目

Data processing and phase identification of onshore-offshore 3D seismic exploration in Zhujiangkou area*

Zuoyong LYU1,2,4(), Xuelin QIU1,4(), Chunming YE2, Jinlong SUN1, Yonghong DUAN3, Jinshui LYU2   

  1. 1. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Guangzhou 510301, China
    2. Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology, China Earthquake Administration, Key Laboratory of Guangdong Province Earthquake Early Warning and Safety Diagnosis of Major Projects, Earthquake Administration of Guangdong Province, Guangzhou 510070, China
    3. Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China
    4. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-08-11 Revised:2016-09-29 Online:2017-05-20 Published:2017-06-01
  • Supported by:
    Science for Earthquake Resilience (XH16029Y);National Natural Science Foundation of China (41676057, 41674092);Cooperation Project between Earthquake Bureau and Province of Guangdong

摘要:

以海上气枪和陆地人工爆破作为震源, 利用陆地流动地震台站、固定地震台站和海底地震仪(OBS)同步接收信号, 首次在南海北部珠江口区域进行了海陆联合三维地震构造探测。文章详细介绍了此次海陆联测的地震数据采集和观测系统、数据预处理方法和震相识别。固定、流动地震台站和OBS大部分均能较清晰地识别出多种震相, 包括Pg、PcP、PmP、Pn、Sg等深部震相。气枪和人工爆破震源的联合使用以及海陆密集台站的同步接收信号, 有效地提高了海陆过渡带的射线覆盖和交叉程度, 为获取研究区海陆过渡带的地壳精细结构奠定了基础。

关键词: 海陆联测, 三维, 气枪震源, 人工爆破, 海底地震仪, 南海北部

Abstract:

Using offshore airguns and onshore explosions as seismic sources, along with portable seismic stations, permanent seismic stations and Ocean Bottom Seismometer (OBS) as a synchronously receiving array, a onshore-offshore 3D seismic exploration experiment was carried out for the first time in the Zhujiangkou area of the northern South China Sea. This paper introduces in detail the seismic data acquisition, observation system, data preprocessing method, and phase identification. A variety of seismic phases, including Pg, PcP, PmP, Pn, and Sg, can be clearly identified in most data collected by the permanent, portable seismic stations and OBS. Jointly using airgun and explosion sources, and dense stations receiving seismic signals simultaneously both on land and at sea, it can highly improve the ray coverage and cross overlap beneath the onshore-offshore transitional belt, which lays a foundation for obtaining fine crustal structure beneath such onshore-offshore area.

Key words: onshore-offshore seismic exploration, 3D, airgun, explosion, ocean bottom seismometer, northern South China Sea