Seismic evidence for a lower-crustal detachment beneath San Francisco Bay, California

Thomas M. Brocher, Jill McCarthy, Patrick E. Hart, W. Steven Holbrook, Kevin Patrick Furlong, Thomas V. McEvilly, John A. Hole, Simon L. Klemperer

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Abstract

Results from the San Francisco Bay area seismic imaging experiment (BASIX) reveal the presence of a prominent lower crustal reflector at a depth of ~ 15 kilometers beneath San Francisco and San Pablo bays. Velocity analyses indicate that this reflector marks the base of Franciscan assemblage rocks and the top of a mafic lower crust. Because this compositional contrast would imply a strong rheological contrast, this interface may correspond to a lower crustal detachment surface. If so, it may represent a subhorizontal segment of the North America and Pacific plate boundary proposed by earlier thermomechanical and geological models.

Original languageEnglish (US)
Pages (from-to)1436-1439
Number of pages4
JournalScience
Volume265
Issue number5177
DOIs
StatePublished - Sep 2 1994

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Brocher, T. M., McCarthy, J., Hart, P. E., Holbrook, W. S., Furlong, K. P., McEvilly, T. V., ... Klemperer, S. L. (1994). Seismic evidence for a lower-crustal detachment beneath San Francisco Bay, California. Science, 265(5177), 1436-1439. https://doi.org/10.1126/science.265.5177.1436
Brocher, Thomas M. ; McCarthy, Jill ; Hart, Patrick E. ; Holbrook, W. Steven ; Furlong, Kevin Patrick ; McEvilly, Thomas V. ; Hole, John A. ; Klemperer, Simon L. / Seismic evidence for a lower-crustal detachment beneath San Francisco Bay, California. In: Science. 1994 ; Vol. 265, No. 5177. pp. 1436-1439.
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Brocher, TM, McCarthy, J, Hart, PE, Holbrook, WS, Furlong, KP, McEvilly, TV, Hole, JA & Klemperer, SL 1994, 'Seismic evidence for a lower-crustal detachment beneath San Francisco Bay, California', Science, vol. 265, no. 5177, pp. 1436-1439. https://doi.org/10.1126/science.265.5177.1436

Seismic evidence for a lower-crustal detachment beneath San Francisco Bay, California. / Brocher, Thomas M.; McCarthy, Jill; Hart, Patrick E.; Holbrook, W. Steven; Furlong, Kevin Patrick; McEvilly, Thomas V.; Hole, John A.; Klemperer, Simon L.

In: Science, Vol. 265, No. 5177, 02.09.1994, p. 1436-1439.

Research output: Contribution to journalArticle

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Brocher TM, McCarthy J, Hart PE, Holbrook WS, Furlong KP, McEvilly TV et al. Seismic evidence for a lower-crustal detachment beneath San Francisco Bay, California. Science. 1994 Sep 2;265(5177):1436-1439. https://doi.org/10.1126/science.265.5177.1436