两种可控震源的浅层地震六分量波场特征  

Six-component Wave Fields Characteristics of Shallow Earthquake of Two Vibroseises

作　　者：李维 郭高源[1,2] 王赟 张丁凡[3] 曹瑜珈 吴志芳 张宝剑 钱荣毅[1,2] Li Wei;Guo Gaoyuan;Wang Yun;Zhang Dingfan;Cao YuJia;Wu Zhifang;Zhang Baojian;Qian Rongyi(School of Geophysics and Information Technology,China University of Geoscience,Beijing 100083,China;MWMC Research,China University of Geoscience,Beijing 100083,China;Youfu Technology Co.,Ltd,Hangzhou Zhejiang 311200,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;College of Information Science and Technology,Zhongkai University of Agriculture and Engineering,Guangzhou Guangdong 510225,China;Fujian Earthquake Agency,Fuzhou Fujian 350001,China)

机构地区：[1]中国地质大学地球物理与信息技术学院,北京100083 [2]中国地质大学“MWMC”研究组,北京100083 [3]杭州友孚科技有限公司,杭州浙江311200 [4]中国地震局地球物理研究所,北京100081 [5]仲恺农业工程学院信息科学与技术学院,广州广东510225 [6]福建省地震局,福州福建350001

出　　处：《工程地球物理学报》2022年第5期716-728,共13页Chinese Journal of Engineering Geophysics

基　　金：国家自然科学基金项目(编号:U1839208,62127815,42150201)。

摘　　要：随着旋转地震学的发展,地震旋转分量观测在浅层工程地质勘查领域的应用值得关注。甲烷爆炸震源和电火花震源是近些年浅层工程地震勘查使用的新型震源,这两种可控震源激发条件下的旋转运动特征尚未得知。本文利用在广州城区进行的甲烷震源和电火花震源激发试验,结合二维浅层介质模型平动和旋转地震的数值模拟结果,证明了在浅层工程地震中进行旋转分量观测的可行性;通过分析两种震源采集数据的频谱特征和不同频带范围的质点偏振特征,对比平动与旋转分量的响应的异同点,发现旋转分量可以提供额外的不同于平动分量的信息、高频信号在旋转分量上更为凸显;河道会令观测数据10Hz以下的面波信号能量大幅衰减。分析结果主要表明了在旋转分量上面波不同于平动分量的特征及应用前景。With the development of rotational seismology,the observation of seismic rotational components deserves more attention in shallow engineering geological prospecting.In shallow seismic exploration,methane detonation source and electric spark source as new sources,and the characteristics of rotational motion under the excitation of these two vibroseises are worth studying.Based on the six-component seismic observation experiments of methane and electric spark sources in Guangzhou city and combining the experiments with numerical simulation of translational and rotational motions in a shallow 2-dimensional model,this paper proves that it’s feasible to capture the rotations induced by shallow engineering vibrations.By analyzing spectrum characteristics and particles polarization of the seismic data in different frequency bands and different frequency characteristics of these two sources,this paper compares the similarities and differences between translational and rotational components,and finds that rotational components can provide additional information different from the translational component and high frequency signals are more prominent in rotational components.Besides,river channel greatly diminishes the energy of surface waves below 10 Hz of observed data.These analyses indicate the characteristics and possible applications of surface waves in rotational components are so different from the ones in translational components.

关 键 词：旋转地震学 六分量 数值模拟 甲烷震源 电火花震源 

分 类 号：P631.4[天文地球—地质矿产勘探]