Symbols and abbreviations
Three types of observations are used to determine the location of the fault and indicate recency of movement. Each of these is labeled on the map in a different color. Abbreviations are also available as a single list for printing (abbreviations, 32kb PDF ). Data sources are labeled on the map as abbreviated references; full references are in the pamphlet.
G - Geomorphic evidence [Definitions and abbreviations]
C - Creep evidence [Discussion][Abbreviations]
T - Trenching evidence [Discussion] [Abbreviations]
The index maps and 1:100,000-scale poster use satellite imagery with shaded relief (Sleeter et al., 2004) for its base map. The 1:12,000-scale page-size plots use 0.3-m (1-ft) orthoimagery for the San Francisco-Oakland area for 2004 (USGS National Map).