Manuscript received 15 February 2001.

Cong et al. (2000) used P-wave dispersion from small earthquakes in the New Madrid Seismic Zone to estimate QP through the use of a continuous-relaxation model. This technique was used as an alternative to the usual spectral-slope techniques and employed an innovative step of comparing group delays relative to those at a reference frequency in order to reduce the bias in the dispersion due to errors in the assumed distance and velocity. The resultant Qm values showed an increasing trend with distance, which they interpreted as due to an increase...

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