阵列式光纤地震仪在西藏易贡湖地区的浅层探测实验研究  

A new application of fiber seismometer in the Yigong Lake,Tibetan Plateau

作　　者：张衡[1] 张文涛 黄稳柱[2,3] 裴顺平 恩和得力海[4] 李云月[5] 赵俊猛 ZHANG Heng;ZHANG WenTao;HUANG WenZhu;PEI ShunPing;Nilot Enhedelihai;LI Elita Yunyue;ZHAO JunMeng(State Key Laboratory of Tibetan Plateau Earth System,Environment and Resources(TPESER).Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083,China;Department of Civil and Environmental Engineering,National University of Singapore,Singapore 117576,Singapore;Department of Earth,Atmospheric,and Planetary Sciences,Purdue University,West Lafayette 47907,USA)

机构地区：[1]中国科学院青藏高原研究所,青藏高原地球系统与资源环境全国重点实验室,北京100101 [2]中国科学院大学材料科学与光电子技术学院,北京100049 [3]中国科学院半导体研究所传感技术国家重点实验室,北京100083 [4]新加坡国立大学土木与环境工程系,新加坡117576 [5]普度大学地球大气行星科学系,美国西拉法叶47907

出　　处：《地球物理学报》2023年第3期1153-1163,共11页Chinese Journal of Geophysics

基　　金：中国科学院科研仪器设备研制项目(YJKYYQ20190075);国家自然科学基金(U1939207,41974109,41776201);中国科学院青年创新促进会(2018097);第二次青藏科考项目(2019QZKK0708)资助。

摘　　要：随着野外观测数据的累积和地震成像技术的发展,对地球内部结构的探测范围越来越大,精度越来越高.利用新的技术手段获得更多的观测数据,不仅填补了研究区观测数据的空白,还有助于提高地下结构的探测精度.利用光纤地震仪耐极端环境和易于布设等优势,本研究使用自主研发的阵列式光纤地震仪在西藏易贡湖地区进行野外试验,首次获得了青藏高原地区主动源和背景噪声的光纤地震数据(包含一条水下测线的数据).利用背景噪声成像手段得到了易贡湖岸近地表S波速度结构,但未获得湖底的速度结构.经分析认为,湖水的流动对架设于湖底的探头造成了干扰.本次试验初步验证了阵列式光纤地震仪在极端野外环境中(尤其是水下)进行数据采集的可行性,为未来在极端环境下的数据采集提供了新思路.Due to the accumulation of observational data and the development of seismic tomography, our detection range of the internal structure of the Earth becomes larger, and the detection accuracy becomes higher. Applying new technologies to increase the amount of seismic observational data not only fills in the gaps of data but also further improves the detection accuracy of underground structures. Based on the development of fiber-optic sensing technology, fiber-optic seismometers have attracted more attention because they can be easily deployed in the field and can withstand extremely harsh environments. In this study, a field experiment using a self-developed fiber seismometer has been conducted in the Yigong Lake, which is located in the southeastern Tibetan Plateau. For the first time, fiber-optic data of the active source and ambient noise in the Tibetan Plateau were obtained, including the data from 8 fiber seismometers deployed at the bottom of the lake. Adopting the ambient noise tomography, near-surface S-wave velocity structure of the riparian was obtained, but the velocity structure beneath the Yigong Lake cannot be resolved at present. Our preliminary analysis is that data from the fiber seismometers under the lake were contaminated by the flowing noise of the lake water. This test verifies the feasibility of using these self-developed instruments for collecting data in extremely harsh environments, especially for collecting data in the water, and it provides new ideas for future data collection in such harsh environments.

关 键 词：阵列式光纤地震仪 数据采集 青藏高原 背景噪声成像 近地表结构 

分 类 号：P631[天文地球—地质矿产勘探]