4 Spectral Analysis of the Parkfield dataset
To investigate the effects of different assumptions about source model, and spatial and temporal variation in path effects (and ECS), we perform a sequence of independent inversions. All of these start from the event spectra calculated in the single spectral decomposition inversion of the entire dataset. We first investigate the effects of spatial binning only, using the entire data set, and then separate the earthquakes into 3 time intervals related to the 2004 M6 earthquake to investigate temporal variation.