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Waveform Retrieval and Phase Identification for Seismic Data from the CASS Experiment

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Abstract

The little destruction to the deployment site and high repeatability of the Controlled Accurate Seismic Source (CASS) shows its potential for investigating seismic wave velocities in the Earth's crust. However, the difficulty in retrieving impulsive seismic waveforms from the CASS data and identifying the seismic phases substantially prevents its wide applications. For example, identification of the seismic phases and accurate measurement of travel times are essential for resolving the spatial distribution of seismic velocities in the crust. Until now, it still remains a challenging task to estimate the accurate travel times of different seismic phases from the CASS data which features extended wave trains, unlike processing of the waveforms from impulsive events such as earthquakes or explosive sources. In this study, we introduce a time-frequency analysis method to process the CASS data, and try to retrieve the seismic waveforms and identify the major seismic phases traveling through the crust. We adopt the Wigner-Ville Distribution (WVD) approach which has been used in signal detection and parameter estimation for linear frequency modulation (LFM) signals, and proves to feature the best time-frequency convergence capability. The Wigner-Hough transform (WHT) is applied to retrieve the impulsive waveforms from multi-component LFM signals, which comprise seismic phases with different arrival times. We processed the seismic data of the 40-ton CASS in the field experiment around the Xinfengjiang reservoir with the WVD and WHT methods. The results demonstrate that these methods are effective in waveform retrieval and phase identification, especially for high frequency seismic phases such as PmP and SmS with strong amplitudes in large epicenter distance of 80–120 km. Further studies are still needed to improve the accuracy on travel time estimation, so as to further promote applicability of the CASS for and imaging the seismic velocity structure.

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Acknowledgments

We would like to thank the Editor, Dr. Elena Kozlovskaya, Dr. Mariusz Majdanski and an anonymous reviewer for their valuable comments, which greatly improved the manuscript. This work was supported by China Earthquake Administration fund (Grant No. 200808068), NSFC (Grant No. 41074032) and special fund from the State Key Laboratory of Geodesy and Earth’s Dynamics.

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Correspondence to Qingyu You or Sidao Ni.

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Li, Z., You, Q., Ni, S. et al. Waveform Retrieval and Phase Identification for Seismic Data from the CASS Experiment. Pure Appl. Geophys. 170, 815–830 (2013). https://doi.org/10.1007/s00024-012-0585-2

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  • DOI: https://doi.org/10.1007/s00024-012-0585-2

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