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 5. Gravity and magnetic models across the San Leandro gabbro. Physical properties are based on measurements on rocks and core samples (Table 1). Profile AA' is along and partly based on a geologic cross section by Graymer (2000a). Profile BB' and CC' are based on surface geology by Graymer (2000a). Geologic symbols: Qa, Quaternary alluvium and related low-density materials; Tn, Neroly Sandstone; Ts, undifferentiated Tertiary sedimentary rocks; KJf, Franciscan Complex; Kjm, Joaquin Miller Formation; KJk, Knoxville Formation; Ko, Oakland Conglomerate; Ks, undifferentiated Cretaceous sedimentary rocks; Jb, basalt; Jgb, gabbro; Jpb, pillow basalt; Jsv, quartz keratophyre; sp, serpentinite; sp-px, pyoxenite. Geographic and other symbols: SF Bay, San Francisco Bay; SL Res, San Leandro Reservoir; Inverted red triangles, recent trace of Hayward Fault (HF) and Chabot Fault (CF); D, density in g/cm3; S, susceptibility in CGS units; Drillhole symbol, thickness of offshore sedimentary basin from seismic and gravity data (Marlow et al., 1999); +, seismicity from relocated hypocenters using a high-resolution double difference relocation procedure within 5 km of the profile (Waldhauser and Ellsworth, 2000, 2002). No vertical exaggeration.
