Imposing Active Sources during High-Frequency Passive Surface-Wave Measurement  

作　　者：Feng Cheng Jianghai Xia Chao Shen Yue Hu Zongbo Xu Binbin Mi 

机构地区：[1]Subsurface Imaging and Sensing Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China [2]School of Earth Sciences, Zhejiang University, Hangzhou 310027, China [3]School of Measurement and Testing Engineering, China Jiliang University, Hangzhou 310018, China [4]Department of Geosciences, Boise State University, Boise, ID 83725, USA

出　　处：《Engineering》2018年第5期685-693,共9页工程（英文）

摘　　要：Passive surface-wave utilization has been intensively studied as a means of compensating for the short-age of low-frequency information in active surface-wave measurement, In general, passive surface-wave methods cannot provide phase velocities up to several tens of hertz; thus, active surface-wave methods are often required in order to increase the frequency range, To reduce the amount of field work, we pro-pose a strategy for a high-frequency passive surface-wave survey that imposes active sources during con-tinuous passive surface-wave observation; we call our strategy ＂mixed-source surface-wave （MSW） measurement,＂ Short-duration （within 10 min） passive surface waves and mixed-source surface waves were recorded at three sites with different noise levels： namely, inside a school, along a road, and along a railway, Spectral analysis indicates that the high-frequency energy is improved by imposing active sources during continuous passive surface-wave observation, The spatial autocorrelation （SPAC） method and the multichannel analysis of passive surface waves （MAPS） method based on cross-correlations were performed on the recorded time sequences, The results demonstrate the flexibility and applicability of the proposed method for high-frequency phase velocity analysis, We suggest that it will be constructive to perform MSW measurement in a seismic investigation, rather than exclusively performing either active surface-wave measurement or passive surface-wave measurement,

关 键 词：Passive surface wave Active surface wave High frequency Mixed-source surface wave Spatial autocorrelation Multichannel analysis of passive surface WAVES 

分 类 号：TB1[一般工业技术]