| 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 |
| Genre: | Article |
| ProdID: | 70011606 |
| Citation Author: | Stauber, D. A. |
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| Citation End Page: | 5459 |
| Citation Issue: | B7 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geophysical Research |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | Two-dimensional compressional wave velocity structure under San Francisco volcanic field, Arizona, from teleseismic P residual measurements.; 1982; Article; Journal; Journal of Geophysical Research; Stauber, D. A. |
| Citation Start Page: | 5451 |
| Citation Volume: | 87 |
| Citation Year: | 1982 |
| Type: | citation/reference |
| Text: | Two-dimensional compressional wave velocity structure under San Francisco volcanic field, Arizona, from teleseismic P residual measurements.; 1982; Article; Journal; Journal of Geophysical Research; Stauber, D. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1982 00:00 -0600 |
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