Fig. 8. P-wave travel-time residual curves for 17 teleseismic events which fall into 8 back-azimuth categories. Distance begins with station 002 (Azusa) at 0 km and increases northeast along the array. The travel times have been corrected for one-dimensional Earth model (IASP91) and for topography variations across the array. Note that for most arrivals, especially those from the northwest, residuals are relatively low at the southern end of the array (0-20 km) and relatively high under the San Gabriel Mountains (20-45 km). Residuals remain high in the Mojave Desert with more scatter due to errors in instrument clock timing. Mean residuals have been removed individually from each curve.