
Imposing Active Sources during High-Frequency Passive Surface-Wave Measurement
Feng Cheng, Jianghai Xia, Chao Shen, Yue Hu, Zongbo Xu, Binbin Mi
Engineering ›› 2018, Vol. 4 ›› Issue (5) : 685-693.
Imposing Active Sources during High-Frequency Passive Surface-Wave Measurement
Passive surface-wave utilization has been intensively studied as a means of compensating for the shortage 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 propose a strategy for a high-frequency passive surface-wave survey that imposes active sources during continuous 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.
Passive surface wave / Active surface wave / High frequency / Mixed-source surface wave / Spatial autocorrelation / Multichannel analysis of passive surface waves
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This study is supported by the National Natural Science Foundation of China (41774115) and the National Nonprofit Institute Research Grant of the Institute for Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences (WHS201306). The authors thank the crews of AoCheng Technology for their help in data collection.
Feng Cheng, Jianghai Xia, Chao Shen, Yue Hu, Zongbo Xu, and Binbin Mi declare that they have no conflict of interest or financial conflicts to disclose.
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