The best individual to determine the location and width of the surface rupture zone is the
engineering geologist. Seismic study maps, such as the State of California Special Studies
Zones Maps (1982), which were developed as part of the Alquist-Priolo Special Studies Zones
Act, delineate the approximate location of active fault zones that require special geologic
studies. These maps also indicate the approximate locations of historic fault offsets, which are
indicated by year of earthquake-associated event, as well as the locations of ongoing surface
rupture due to fault creep

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