3-dimensional geologic map of the San Andreas fault

The images on the left (upper is geologic map, lower, aeromagnetic map) are critical inputs into creating a 3-dimensional geologic map of the central San Andreas fault between Parkfield and Pinnacles National Park, California. Fault surfaces are in red and stratigraphic horizons are other colors. The 3-dimensional map shows that these rocks are offset mot just by the San Andreas fault, but a broad zone of deformation that includes thrust faults and significant folding. Although the San Andreas fault is famous, some of these smaller faults have produced damaging earthquakes. This information allows us to understand how these faults have evolved through time and model how these structures interact.