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David Griffing   |   Experiencing Cascade Volcanoes   |   geology   |   October 2009

The tranquil blue of Crater Lake belied its violent history…

 
The field trip participants at Crater Lake National Park, Oregon.
Dr. Johnson and students identify different volcanic rocks in the visitor's center wall at Crater Lake.
Brandt Kayser '11 (foreground) and Brian Terbush '11 (background) examine volcanic deposits at Crater Lake.
Skylar Haas '11 (left) and Kim Negrich '11 (right) take in the view while eating lunch at Crater Lake.
The "Pumice Desert" (foreground) represents an ancient pyroclastic flow; a fast-moving cloud of hot gas, ash and pumice blocks that kills everything in its path.
The central caldera (collapse crater) of Newberry Volcano at Newberry National Volcanic Monument, Oregon.
Andrew Parisi '11 examines a block of solid volcanic glass at Big Obsidian Flow in Newberry caldera.
The group examines features along the Lava Tree Forest Trail, Newberry National Volcanic Monument, Oregon.
Matt Caldwell '11 examines a tree mold formed as lava cool against a Ponderosa Pine tree before burning it away.
The group investigates a series of volcanic mudflow deposits in Mount St. Helens National Volcanic Monument, Washington.
Sarah Timm '10 stands by blocks of volcanic breccia (pronounced bret-cha); a rock made of many erupted rock fragments. Mount St. Helens National Volcanic Landmark, Washington.
The base of Mount St. Helens (obscured by clouds in background) slowly returns to life after the 1980 eruption that removed the peak and northern flank of the mountain.
 
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The department led a three-day field trip to three Cascade Range volcanoes in Oregon and Washington for 12 students. The tranquil blue of Crater Lake belied its violent history; nearly 7,000 years ago, an eruption removed 4,000 feet of the mountain! We were amazed by the spectacular Big Obsidian Flow (a 100-foot thick lava flow made of volcanic glass) during a hike through Newberry Volcano caldera. Although the summit remained in clouds during our visit, Mount St. Helens didn’t disappoint; the features around Johnston Ridge told the almost unbelievable story of the massive 1980 eruption.

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