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Geophysical detection of near-surface voids caused by mining, tunnels, karst features, etc., is a persistent problem that has not been solved either consistently or across multiple geologic settings. Multiple methods have been used with varying degrees of success. We present shallow seismic data collected at a test site with a 9.1-m deep tunnel in(More)
Geophysical detection of clandestine tunnels is a complex problem that has met with limited success. Multiple methods have been applied, spanning several decades, but a reliable solution has yet to be found. We evaluated shallow seismic data collected at a tunnel test site representative of geologic settings found along the southwestern U.S. border. Our(More)
Near-surface seismic data were collected at multiple sites in Afghanistan to detect and locate subsurface anomalies, including clandestine tunnels. Examples shown here include data collected over the escape tunnel discovered at the Sarposa prison in Kandahar, Afghanistan, that allowed over 480 prisoners to escape (data were collected post-discovery), data(More)
The use of dissolution wells for mining salt has been common practice for over a century, leaving behind brine-filled " salt jugs " or voids in the subsurface which, over time, can migrate through overlying rock formations, potentially leading to sinkhole formation and public safety hazards. In an effort to determine the relative range of stress on the roof(More)
Enhanced processing procedures on passive multichannel analysis of surface-waves (MASW) data were utilized to identify velocity anomalies above known salt solution voids in Hutchinson, Kansas, likely caused by the changing stress field due to the migration and/or expansion of the void. Previous geophysical studies within the study area provided information(More)
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