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Two-dimensional compressional wave velocity structure under San Francisco volcanic field, Arizona, from teleseismic P residual measurements.

Journal of Geophysical Research
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Abstract

A low compressional-wave velocity region in the midcrust below the San Francisco Mountain stratovolcano, Arizona, has been detected by the teleseismic P residual technique. This region is approx 6km wide, lies between elevations of 9km and 34km below sea level, and has a compressional velocity reduction of 65 with respect to the surrounding rocks. Several mechanisms are found to be quantitatively sufficient to produce such a feature. These include 1) a cool silicic pluton enclosed in a more mafic crust, 2) high temperature (near but below the solidus) in a quartz-bearing rock in the low-velocity region, 3) high density of water-filled cracks having pore pressures nearly equal to lithostatic pressure, and 4) the presence of melt, either in intergranular pores or in crystal-poor dikes.-Author

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Two-dimensional compressional wave velocity structure under San Francisco volcanic field, Arizona, from teleseismic P residual measurements.
Series title Journal of Geophysical Research
Volume 87
Issue B7
Year Published 1982
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Geophysical Research
First page 5451
Last page 5459