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Science Tour - 3D/4D mapping of the San Andreas Fault Zone

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distribution of recent earthquakes beneath the Santa Clara Valley Data integration: A 3D geologic model gives geoscientists new ways to examine the structure of the earth. These two views of the data model illustrate how data is used to construct a 3D model.



The 3-D distribution of recent earthquakes beneath the Santa Clara Valley and vicinity is used to define the location and shape of active fault surfaces within the map volume. Active faults include the Calaveras fault, the Loma Prieta fault, the Hayward fault, a concealed basinward strand of the Monte Vista fault system, and a possible steep fault within the Diablo Range defined by a band of earthquakes known informally as the Mount Lewis Trend.

Computer-based representations extend beyond the capability of a standard Geographic Information System to provide continuous quantitative information for land-use planning, hazard mitigation, and resource management. Such representations allow the non-geologist user to 'walk around' in the Earth to examine data and extract information.

3D geologic model of the southern San Francisco Bay region The project is using geologic map data from the San Francisco Bay area to compile 3-D geologic maps of a broad region centered on Silicon Valley. These maps will be used as a framework for ground-shaking estimation, refined earthquake and fault location, resource exploration, contaminant-source and dispersion-pathway definition, ground-water flow modeling, and landslide modeling.

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