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GEOPHYSICAL SERVICES

Crawford Hydrology Lab offers geophysical investigation services through the use of Microgravity and Ground Penetrating Radar to locate and identify subsurface anomalies.

MICROGRAVITY

Bouguer gravity can identify locations on the earth's surface that have relatively higher or lower gravity caused by lateral variations in subsurface density. Since regolith is less dense than limestone, Bouguer gravity can also identify variations in depth to bedrock. Low-Gravity anomalies indicate bedrock caves, voids in the regolith (such as regolith arches), or places where depth to bedrock is abruptly greater (which is often indicative of places where regolith may be descending along regolith arches into bedrock crevices).
Scintrex CG-3M Autograv
Microgravity Sensor
 
LaCoste and Romberg
Model D Microgravity Meter
 

Former projects include:

Sinkhole collapses

Detection of voids at potential highway, building and dam construction sites

Detection of cave streams prior to drilling of monitoring, injection or recovery wells

Detection of voids in regolith above bedrock and depth to bedrock 

Over 60 wells have been drilled by Dr. Crawford into caves detected through the use of Microgravity.
A collage of sinkhole
related projects.
 

 

GROUND PENETRATING RADAR

GPR can be used to detect voids in regolith, depth to bedrock, buried materials (such as drums or pipelines), and suspected collapses under buildings. Crawford Hydrology personnel uses GPR either in conjunction with microgravity or independently when strong vibrations are present (such as inside a factory) excluding the use of Microgravity.

Former projects include:

Detection of voids between a highway and the underlying regolith 

Detection of voids between a factory floor and the underlying regolith

Detection of soil pipes under a concrete floor.
For more detailed information on karst related issues, don't forget to visit:

Crawford Hydrology Laboratory
Center for Cave and Karst Studies
Department of Geography and Geology
1 Big Red Way / EST 403
Bowling Green, KY 42101
(270) 745-9224