| 海底地震仪(OBS)主动源转换横波的应用 |
| |
| 引用本文： | 张洁,李家彪,阮爱国,卫小冬,牛雄伟,于志腾,庞新明.海底地震仪(OBS)主动源转换横波的应用[J].地球科学,2018,43(10):3778-3791. |
| |
| 作者姓名： | 张洁 李家彪 阮爱国 卫小冬 牛雄伟 于志腾 庞新明 |
| |
| 作者单位： | 1.国家海洋局海底科学重点实验室, 国家海洋局第二海洋研究所, 浙江杭州 310012 |
| |
| 基金项目： | 国家重大研究计划重点支持项目91228205国家重大研究计划重点支持项目91428204国家青年科学基金项目41706044国家重大研究计划重点支持项目91628301"全球变化与海气相互作用"专项GASI-GEOGE-01国家重大研究计划重点支持项目91028006国家海洋局第二海洋研究所基本科研业务费专项JG1509国家海洋局第二海洋研究所基本科研业务费专项JG1602 |
| |
| 摘 要： | 横波（S波）为偏振波，具有不同于纵波（P波）的特性，对于地震探测具有特殊的意义.在被动源地震探测中已得到广泛的应用，如接收函数、S波分裂等.在主动源（气枪）海底地震（OBS）探测中，震源在水中，S波为地层转换波，其应用还不多.本文在介绍转换S波的产生、模式、处理和识别的基础上，以实例为切入点简述其具体应用.这些应用主要是基于1D/2D转换S波，用于揭示海底岩石类型、推断地壳性质、共轭陆缘问题、判定地幔蛇纹石化、估算天然气水合物的饱和度和预测流体等.目前在南海已获得了大量的2D和3D的OBS转换S波数据，可将转换S波的研究逐步从2D发展到3D研究，同时结合其他地球物理资料进行共同分析.利用转换S波的研究，有利于揭示南海扩张停止后形成的海山下不同地层的岩性和判定上地幔低速的性质等.
|
| 关 键 词： | 海底地震仪(OBS) 转换横波 纵横波速比 地球物理 |
| 收稿时间： | 2018-01-19 |
Application of Converted S-Waves from the Active-Source Ocean Bottom Seismometer Experiment |
| |
| Abstract: | Shear waves are polarized waves showing different characteristics from compressional waves, which are specially important to the seismic exploration. They have been widely used in the passive-source seismic studies, such as the receiver functions and shear wave splitting. However the application of shear waves is still limited in the active-source ocean bottom seismometer exploration. Shear waves are converted waves for the underwater seismic source. In this paper, we firstly summarize the conversion, mode type, processes and identification of shear waves. And we also use real examples to introduce different applications in different oceans. The studies of converted shear waves are mainly used to reveal the submarine rock property, infer the crustal type, discuss the conjugate relationship of the continental margin, identify the mantle serpentinization, infer gas hydrate saturation and predict the fluids based on 1D/2D converted shear waves. Numerous 2D/3D OBS data have been collected in the South China Sea, hence we can gradually change the studies of converted shear waves from 2D to 3D and conduct analysis in combination with other geophysical data. Using those data will help to reveal the composition of seamounts and identify the porosity of the low-velocity upper mantle in the South China Sea. |
| |
| Keywords: | |
|
| 点击此处可从《地球科学》浏览原始摘要信息 |
| 点击此处可从《地球科学》下载免费的PDF全文 |
|
