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The Cascadia Subduction Zone: two contrasting models of lithospheric structure

Physics and Chemistry of the Earth

By:
, , and
DOI: 10.1016/S0079-1946(98)00028-7

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Abstract

The Pacific margin of North America is one of the most complicated regions in the world in terms of its structure and present day geodynamic regime. The aim of this work is to develop a better understanding of lithospheric structure of the Pacific Northwest, in particular the Cascadia subduction zone of Southwest Canada and Northwest USA. The goal is to compare and contrast the lithospheric density structure along two profiles across the subduction zone and to interpet the differences in terms of active processes. The subduction of the Juan de Fuca plate beneath North America changes markedly along the length of the subduction zone, notably in the angle of subduction, distribution of earthquakes and volcanism, goelogic and seismic structure of the upper plate, and regional horizontal stress. To investigate these characteristics, we conducted detailed density modeling of the crust and mantle along two transects across the Cascadia subduction zone. One crosses Vancouver Island and the Canadian margin, the other crosses the margin of central Oregon.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The Cascadia Subduction Zone: two contrasting models of lithospheric structure
Series title:
Physics and Chemistry of the Earth
DOI:
10.1016/S0079-1946(98)00028-7
Volume
23
Issue:
3
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Physics and Chemistry of the Earth
First page:
297
Last page:
301