Crustal architecture of the Cascadia Forearc
Science
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Abstract
Seismic profiling data indicate that the thickness of an accreted oceanic terrane of Paleocene and early Eocene age, which forms the basement of much of the forearc beneath western Oregon and Washington, varies by approximately a factor of 4 along the strike of the Cascadia subduction zone. Beneath the Oregon Coast Range, the accreted terrane is 25 to 35 kilometers thick, whereas offshore Vancouver Island it is about 6 kilometers thick. These variations are correlated with variations in arc magmatism, forearc seismicity, and long-term forearc deformation. It is suggested that the strength of the forearc crust increases as the thickness of the accreted terrane increases and that the geometry of the seaward edge of this terrane influences deformation within the subduction complex and controls the amount of sediment that is deeply subducted.
Suggested Citation
Trehu, A., Asudeh, I., Brocher, T.M., Luetgert, J.H., Mooney, W.D., Nabelek, J., and Nakamura, Y., 1994, Crustal architecture of the Cascadia Forearc: Science, v. 266, no. 5183, p. 237-243, https://doi.org/10.1126/science.266.5183.237.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Crustal architecture of the Cascadia Forearc |
| Series title | Science |
| DOI | 10.1126/science.266.5183.237 |
| Volume | 266 |
| Issue | 5183 |
| Year Published | 1994 |
| Language | English |
| Publisher | Science |
| Contributing office(s) | Earthquake Science Center |
| Description | 7 p. |
| First page | 237 |
| Last page | 243 |