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Imposing Active Sources during High-Frequency passive surface-Wave Measurement

Engineering 2018年第5期4卷 685-693页

作者： Feng Cheng Jianghai Xia Chao Shen Yue Hu Zongbo Xu Binbin Mi Subsurface Imaging and Sensing Laboratory Institute of Geophysics and Geomatics China University of Geosciences Wuhan 430074 China School of Earth Sciences Zhejiang University Hangzhou 310027 China School of Measurement and Testing Engineering China Jiliang University Hangzhou 310018 China Department of Geosciences Boise State University Boise ID 83725 USA

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

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