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Puget sound low lands WA state?
I heard that the low lands in WA state thousands of years ago where part of the puget sound. When Mt. Rainier exploded the lava filled in the low land just enough where the puget sound cant flow. Is this true?
3 Answers
- SkookumLv 71 decade agoFavorite Answer
Lava flows in Mount Rainier's past seem to have only effected areas on or very near the mountain, only up to about 9 miles away. (source 1 below)
That area of the Pacific Coast is uplifting. That lowland area (lowland is one word) used to be submerged, but the uplift has brought it above sea level.
Shorelines rose as much as 7 meters along southern Puget Sound and Hood Canal between 500 and 1700 years ago. Evidence for this uplift consists of elevated wave-cut shore platforms near Seattle and emerged, peat-covered tidal flats as much as 60 kilometers to the southwest. The uplift was too rapid for waves to leave intermediate shorelines on even the best preserved platform. The tidal flats also emerged abruptly; they changed into freshwater swamps and meadows without first becoming tidal marshes. Where uplift was greatest, it adjoined an inferred fault that crosses Puget Sound at Seattle and it probably accompanied reverse slip on that fault 1000 to 1100 years ago. The uplift and probable fault slip show that the crust of the North America plate contains potential sources of damaging earthquakes in the Puget Sound region. (source 2 below)
Source(s): http://www.emporia.edu/earthsci/student/zellers1/r... http://www.sciencemag.org/cgi/content/abstract/258... - ?Lv 61 decade ago
It has been a long time since I lived in that area, but my memory of the geology would make me doubt this. That would be one heck of a long lava flow, and the cone of Rainier doesn't indicate a flow like that. I suspect that Puget Sound is tectonic, not volcanic.
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