Diffraction enhancement is a seismic data processing method that is used to locate anomalies within the subsurface based on the diffraction that is generated as seismic waves interact with the anomaly. This method is often employed to aid in the detection of voids (i.e. tunnels) in the shallow subsurface. Conventionally, diffraction enhancement processing takes advantage of the higher velocity p-wave energy without consideration for the s-wave returns due to the s-wave having a more complex interaction with the subsurface and a higher amount of interference at the s-wave velocity due to other near surface wavefields. The work presented here shows that when the s-wave is considered and processed correctly it can help to improve precision of the void location estimation and increase certainty of detection for difficult to interpret datasets.
Presentation Date: Tuesday, September 17, 2019
Session Start Time: 8:30 AM
Presentation Time: 11:00 AM
Presentation Type: Oral