Figure 1. Location of the two-color EDM network and the BTSM network with respect to the San Andreas fault and other localities at Parkfield, CA. The monuments at POMO and MIDE have nearby monuments POMM and MIDA (not identified in the figure). POMM and MIDA are deeply anchored and are described by Langbein et al. (1995). Geophysical Research Letters, 1999.