To address questions raised by the 1989 Loma Prieta earthquake, the USGS conducted two seismic refraction/wide-angle reflection surveys in the San Francisco Bay area during 1991. the depth and wave propagation characteristics of the 1989 Loma Prieta earthquake pointed out the need for a more detailed understanding of the crustal structure within the greater San Francisco Bay area. To better understand the Loma Prieta epicentral region, a 25-km-long high resolution profile was recorded across the Santa Cruz Mountains; the LP profile. A 180-km-long profile (SF profile) was recorded along the San Francisco and Marin Peninsulas to determine the wave propagation effects in the San Francisco region.
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