This preview shows page 1. Sign up to view the full content.
Unformatted text preview: A.D accompanied by a tsunami in Puget sound- Rates of displacement and earthquake recurrence intervals for the Seattle fault are essentially unknown. Cascadia subduction zone northwestern NA, boundary between juan de fuca and north American plate-its trenches disappeared only because rivers filled it up after the glaciers left. - the two plates are locked, the NA plate is being uplifted and shortened. - such large earthquakes occur every 539 years. Basin and range province of the western US is a world-famous region of crustal extension and thinning. Extension occurs by displacements along the normal faults that bound the many mountain ranges within the province and that define its western sierra Nevada and eastern Wasatch front boundaries....
View Full Document
- Fall '07