Shear wave attenuation measurements from converted-wave VSP data

Michelle C. Montano, Donald C. Lawton, Gary F. Margrave

QS values were estimated from converted-wave VSP data using the spectral-matching method. These values were computed from a walk-away VSP. Then, we conveyed these results into a single value at zero-offset by using the QVO method. For this study, QS values determined range from 20 to 50, suggesting a strong attenuation for the shear waves. Moreover, we were able to compare QS/QP ratios versus VP/VS ratios to understand the rock properties of the study area.