Pete is applying the methods of Shiomi et al. (1997), whom correlated the power spectral densities of sonic logs to tectonic provinces in Japan, to Oklahoma.  Using the sonic logs, as well as gamma ray, ITT, and resistivity logs that he has collected, digitized and QCed, Pete is studying how the slope of the power-spectral densities correlates to varying crustal provinces of Oklahoma.  He will also compare the results to regions of induced seismicity in the attempt to better understand potential subsurface heterogeneities that may be contributing to seismicity.