Utilities for working with seismic waveform data via ObsPy. Brad T. Aagaard, U.S. Geological Survey Features * Boore (1999) V0 baseline corrections. * Add longitude, latitude, distance, and azimuth to waveform metadata. * Remove structures from CISN station lists. * Group waveforms by station. * Pickle/Unpickle helper functions. * Convert SPECFEM3D waveform output to ObsPy stream.