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Tectonics and seismicity of the southern Washington Cascade range

Bulletin of the Seismological Society of America

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Abstract

Geophysical, geological, and seismicity data are combined to develop a transpressional strain model for the southern Washington Cascades region. We use this model to explain oblique fold and fault systems, transverse faults, and a linear seismic zone just west of Mt. Rainier known as the western Rainier zone. We also attempt to explain a concentration of earthquakes that connects the northwest-trending Mount St. Helens seismic zone to the north-trending western Rainier zone. Our tectonic model illustrates the pervasive effects of accretionary processes, combined with subsequent transpressive forces generated by oblique subduction, on Eocene to present crustal processes, such as seismicity and volcanism.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Tectonics and seismicity of the southern Washington Cascade range
Series title:
Bulletin of the Seismological Society of America
Volume
86
Issue:
1 SUPPL. A
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of the Seismological Society of America
First page:
1
Last page:
18
Number of Pages:
18