Two-dimensional compressional wave velocity structure under San Francisco Volcanic Field, Arizona, from teleseismic P residual measurements
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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 approximately 6 km wide, lies between elevations of 9 km and 34 km below sea level, and has a compressional velocity reduction of more than 6% 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.
| 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 Solid Earth |
| DOI | 10.1029/JB087iB07p05451 |
| Volume | 87 |
| Issue | B7 |
| Publication Date | September 20, 2012 |
| Year Published | 1982 |
| Language | English |
| Publisher | American Geophysical Union |
| Description | 9 p. |
| First page | 5451 |
| Last page | 5459 |