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Geology; April 2000; v. 28; no. 4; p. 303-306; DOI: 10.1130/0091-7613(2000)28<303:RCTVOT>2.0.CO;2
© 2000 Geological Society of America
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Regional crustal thickness variations of the Peninsular Ranges, southern California

Jennifer L. Lewis1, Steven M. Day1, Harold Magistrale1, Jennifer Eakins2 and Frank Vernon2

1 Department of Geological Sciences, San Diego State University, San Diego, California 92182-1020, USA
2 Scripps Institute of Oceanography, University of California at San Diego, La Jolla, California 92093-0025, USA

We used the teleseismic receiver function technique to obtain a profile of the crustal thickness of the northern Peninsular Ranges, California. Depth to the Moho varies from ~37 km beneath the western Peninsular Ranges batholith to ~27 km at the western edge of the Salton trough, an average apparent dip of ~10° to the west over a lateral distance of 60 km. We previously obtained a similar result for a profile ~100 km to the south (a Moho dip of ~20° over 30 km lateral distance). In both cases, the Moho depth variations do not correlate with topography of the eastern batholith, but rather appear to parallel the trend of a boundary that separates compositionally distinct eastern and western terranes. These observations suggest that a steeply dipping Moho is a regional feature beneath the eastern Peninsular Ranges, and that compensation is through lateral variations in crustal or upper mantle density rather than through an Airy root.

Key Words: crustal thickness • isostasy • Peninsular Ranges • receiver functions




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