A proposed modeling technique that yields a best fit to observed
wide-angle reflection profiles incorporates (1) the use of migrated vertical
reflection profiles to provide topographic control, (2) ray tracing
to produce theoretical wide-angle reflection profiles for hypothetical
crustal sections, and (3) the iterative adjustment of crustal layer dip,
thickness and velocity. The technique, applied to four successive wide angle
reflection profiles located due west of Callao, Peru, and extending
from 50 km west of to 80 km east of the axis of the Peru-Chile
trench, suggests (1) that a 5 km thick oceanic crust thickens to 7 km
at the trench axis, (2) that the oceanic plate underthrusts the continental
plate, and (3) the existence of a previously undetected 7.8 km per
sec oceanic layer. Migrated vertical reflection profiles show (1) a
series of block faults across 20 km of the trench edge of the continental
plate and (2) oceanic basement underthrusting 6 km of the trench edge
of the continental plate. / Graduation date: 1974
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/28334 |
| Date | 29 October 1973 |
| Creators | Goebel, Vaughn |
| Contributors | Johnson, Stephen |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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