Bulletin of the Seismological Society of America; February 2003; v. 93; no. 1;
p. 14-26; DOI: 10.1785/0120020013
© Seismological Society of America
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Figure 6. Schematic cross sections along profile AA' across the northern part of the San Leandro gabbro. (A) Model of a tabular San Leandro gabbro body detached from oceanic basement layer; (B) model suggesting that the San Leandro gabbro is attached to flat lying oceanic basement; (C) model with the San Leandro gabbro and coast range fault folded and thrusted and extending to the Mount Diablo region. Geophysical modeling may not be able to resolve the differences between model A and B, but model C is unlikely. Geologic symbols: Qa, Quaternary alluvium and related low-density materials; Ts, undifferentiated Tertiary sedimentary rocks; KJf, Franciscan Complex; Ku, undifferentiated Cretaceous Great Valley Complex; Jgb, gabbro. Inverted black triangles, recent trace of Hayward Fault (HF) and Chabot Fault (CF); ?, questionable boundary, other boundaries based on geologic information and geophysical modeling.
