Maps of Interest Series - The Washington Mountains

Jan 13, 2015 -- Maps of Interest includes downloadable large format maps of geological places of interest around the United States. Free for use but not for resale or modification.

 
Mount St. Helens
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On March 20, 1980 a magnitude 4.2 earthquake signaled the reawakening of the volcano after 123 years. During the Spring of 1980, rising magma pushed the volcano's north flank outward 5 feet per day. On the morning of May 18, 1980, the largest terrestrial landslide in recorded history reduced the summit by 1,300 feet and triggered a lateral blast.  Within 3 minutes, the lateral blast, traveling at more than 300 miles per hour, blew down and scorched 230 square miles of forest. Within 15 minutes, a vertical plume of volcanic ash rose over 80,000 feet. By afternoon of May 18, 1980, the dense ash cloud turned daylight into darkness in eastern Washington, causing streetlights to turn on in Yakima and Ritzville. The volcanic ash cloud drifted east across the United States in 3 days and encircled Earth in 15 days. (Source: USGS)
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Mount Rainier
The volcanic cone of Mount Rainier is about 500,000 years old, although an early ancestral cone
composed of lava flows is over 840,000 years old.
 
US Land GridThis map was made with all data sourced from US Land Grid vector and WMS layers. US Land Grid provides high resolution land grid data, cultural data, oil and gas data and ownership data.


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