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Summary for Field Activity Number 1991-032-FA

Area of Operations: Golden Gate Bridge to Farallon Islands, California, United States, North America, North Pacific

Dates: September 18, 1991 to September 20, 1991

Objectives: Determine an accurate two-dimensional velocity structure across the vicinity of San Francisco, from an accretionary prism overlying continental crust to normal oceanic crust. Image the lower crust and moho beneath the marginal sedimentary pile that is invisible in available multichannel seismic reflection lines across the margin. Establish the extent of subducted oceanic crust under the margin. Determine an accurate two-dimensional velocity structure along the San Francisco Bay. Search for major faults crossing the bay and continental margin. Augment the BASIX data set of marine multichannel seismic reflection and land seismic refraction to help determine whether major faults in the Bay Area are connected at depth.

Type of Activity:

Information to be derived:


USGS Project Number: BASIX

Contact: Uri ten Brink (

InfoBank: uses the identifier S-1-91-NC. Visit this site for more information.

Click to get Google Software - Download 91032.kml to view this field activity in Google Earth

Map for Area of Operations :

Map of field activity boundary.

Platform Info:

The following materials for this field activity are available in the Information Archives:

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