Crosshole surveying of rock quality
Assessing possible dam damage
Testing integrity of concrete foundations

Typical source and receiver configuration for crosshole surveys, here used to examine the quality of rock surrounding a tunnel.

From reseller Geotomographie, used by permission.

Assessing possible earthquake damage in dams.

From Application of Elastic Wave Tomography for Dam safety. Sheng-Hsung Hsieh, Chih-Hsin Hu, Shih-Hsien Hsieh, Jen-Kai Huang, Cheng-Yang Yen, Wen-Lung Chi, and Caho-Ming Lin. Presented at SAGEEP 2012, Tucson, AZ, USA, Mar.25-29, 2012, Poster Session Two, Wed. Mar.28. Used by permission.

Testing integrity of deep concrete foundations.

This picture shows an application in checking the integrity of deep concrete foundations. Access tubes placed in the foundation as it is made allow sources and receivers to measure traveltimes in the concrete, and then tomographic inversion is used to determine if there are zones of low velocity indicating voids or poor concrete.

From reseller Olson Instruments, Inc., used by permission.