Detecting an underground tunnel by applying joint traveltime and waveform inversion

Jiang, Wenbin; Zelt, Colin A.; Zhang, Jie

doi:10.1016/j.jappgeo.2020.103957

Detecting an underground tunnel by applying joint traveltime and waveform inversion

Journal Article · Mon Jan 20 23:00:00 EST 2020 · Journal of Applied Geophysics

DOI:https://doi.org/10.1016/j.jappgeo.2020.103957· OSTI ID:1801014

Jiang, Wenbin ^[1]; Zelt, Colin A. ^[2]; Zhang, Jie ^[3]

Nanjing Univ. (China); Univ. of Science and Technology of China, Hefei (China). Geophysical Research Inst.; OSTI
Rice Univ., Houston, TX (United States)
Univ. of Science and Technology of China, Hefei (China). Geophysical Research Inst.

Underground tunnel and void detection is a challenging geophysical problem, and many methods have been proposed. Seismic techniques are promising because of the large seismic velocity contrasts between the air-filled void and the surrounding sediment and concrete. We apply a joint seismic traveltime and waveform inversion method to image a buried tunnel with concrete walls and a void space inside. The joint inversion images the top of the concrete tunnel as a high-velocity anomaly and the void space as a low-velocity anomaly. The location of the velocity anomalies predicted by the method agrees with the known location of the tunnel. As a comparison, the stand-alone full waveform inversion is also applied to the data. The first-arrival traveltime tomography shows weak nonlinearity but fails to image the hidden low-velocity layer. Full waveform inversion is able to image complex near-surface structures, but fitting waveforms may not honor the traveltime fit, especially when the data contain noise. Synthetic and real data tests show that the joint inversion method retains the advantages of both traveltime inversion and full waveform inversion and overcomes their respective drawbacks at the same time. The field example shows the joint inversion provides a better reconstruction of the high-velocity feature representing the top of the concrete wall in terms of its magnitude and location.

View Accepted Manuscript (DOE)

Research Organization:: Rice Univ., Houston, TX (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); National Natural Science Foundation of China (NSFC); China Postdoctoral Science Foundation; National Science Foundation (NSF)

Grant/Contract Number:: FG07-97ER14827

OSTI ID:: 1801014

Alternate ID(s):: OSTI ID: 1702039

Journal Information:: Journal of Applied Geophysics, Journal Name: Journal of Applied Geophysics Journal Issue: C Vol. 174; ISSN 0926-9851

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Detecting an underground tunnel by applying joint traveltime and waveform inversion

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