Cross-hole tests, such as cross-hole seismic and cross-hole sonic logging, can be beneficial for assessing soil and rock properties:

 Cross-hole tests, such as cross-hole seismic and cross-hole sonic logging, can be beneficial for assessing soil and rock properties: 

Cross-hole seismic tests

These tests can help identify hidden layer velocity anomalies that are not detectable using surface methods. They can also help determine the dynamic properties of soil and rock, which can be used for earthquake design, liquefaction potential studies, and more. 

Cross-hole sonic logging (CSL)

CSL is a reliable technique for assessing the structural integrity of deep foundations. It can help identify potential shaft anomalies, and can be used to collect data for engineering analysis. CSL test results are relatively easy to interpret, and are not affected by skin friction, soil stiffness, or damping characteristics. 

Ground improvement

Cross-hole geophysical testing can show that the ground has been improved in cases where cone penetration tests are unable to demonstrate the same level of improvement. 

Design verification

Cross-hole geophysical testing can be used to verify variations of commonly accepted designs, which can save construction time and costs.