| The San Andreas fault rupture of the 1906 San Francisco earthquake in Marin County was documented by G.K. Gilbert and others and is well preserved within the Point Reyes National Seashore. Published and unpublished historical photographs, notebooks, aerial photographs, and maps were analyzed to document the exact location and style of deformation of the earthquake and the morphological changes in the landscape.; Relocated 1906 photographs, survey data, and historic maps were compiled into a digital GIS database. Analyses of the position of a pre- and post-earthquake meander loop, fence location, and utility poles adjacent to the famous 20-foot road offset indicate coseismic slip between 4.4-7.5m. A new coseismic slip of 5m is also documented from{09}historical notes at the Vedanta wind gap site.; High-resolution topographic data from RTK GPS and conventional surveying yields a displacement 6-8 m cumulative displacement along the 1906 trace for this site. |
