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Bulletin of the Seismological Society of America; August 1986; v. 76; no. 4; p. 1011-1024
© 1986 Seismological Society of America
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Crustal structure of the Washington continental margin from refraction data

J. JOHN TABER* and B. T. R. LEWIS

GEOPHYSICS PROGRAM AK-50 UNIVERSITY OF WASHINGTON, SEATTLE, WASHINGTON 98195
SCHOOL OF OCEANOGRAPHY WB-10 UNIVERSITY OF WASHINGTON, SEATTLE, WASHINGTON 98195

Abstract

Refraction data were collected in an onshore-offshore experiment in 1978 near Grays Harbor, Washington. Two-dimensional raytracing and synthetic seismograms were used to model the data along the refraction lines. The resulting velocity model uses a broad-scale subduction zone geometry to explain the major features of the data. The three main contributions of the onshore-offshore model are: (1) evidence for an approximately 9° dip of the subducting oceanic lithosphere; (2) a clear indication of the point at which the subducting slab begins to bend beneath the margin; and (3) confirmation of the continuity of the slab from the buried trench offshore to beneath Puget Sound. The model also helps explain the distribution and stress orientation of earthquakes within the subduction zone.

Footnotes

* Present address: Lamont-Doherty Geological Observatory, Palisades, New York 10964.




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