Highlight 17--Experimental
Three-Dimensional Geologic Maps
Figure 17 is derived from a three-dimensional (3-D) geologic and geophysical data base consisting of digitally defined 3-D map elements (for example, faults, depositional strata, and topography) for the southern San Francisco Bay area. It also includes scattered data such as earthquake hypocenters and continuous physical and chemical property fields. These elements are linked by quantitative relationships that specify the spatial interactions among the various data. In this portrayal of the relationships among geology, active faults, and seismicity in the San Francisco Bay area, Cenozoic deposits are shown in yellow, Franciscan Complex rocks are shown in green, and Cretaceous granitic basement rocks are shown in pink. Major strike-slip faults are indicated by vertical red curtains, and earthquake hypocenters for 1969-94 are represented by spheres color coded by magnitude.
Figure 17. Experimental three-dimensional depiction of geologic and seismic data for the southern San Francisco Bay area. From Robert C. Jachens, USGS (unpublished data, 1998).
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Maintained by L. McElroy
Last updated 04.08.98