|Looking south from Hurricane Ridge into the heart of Olympic National Park|
Subduction zones are places where oceanic crust sinks back into the Earth's mantle to be recycled at some future time as magma and lava. The mud and sand that blankets the coast and seafloor often will be scraped off against the edge of the continent to form a highly deformed and sheared deposit called an accretionary wedge. Much of the time, wedge deposits remain underwater or show as low-lying islands, but sometimes the rock gets pushed up into mountain ranges parallel to the coast and subduction zone. California's Coast Ranges resulted in part from such activity, but at Olympic National Park in Washington State, the results are nothing short of spectacular. The mountains have been pushed up into a series of peaks exceeding 7,000 feet in elevation, and with the intense amounts of snowfall, there are a surprising number of active glaciers.
|Looking north from Hurricane Ridge across the Juan de Fuca Strait to Vancouver Island|