The Aftermath - Crater Lake, OR
Posted by: 
saopaulo1
N 42° 54.694 W 122° 08.571
10T E 569965 N 4751351
One of a few signs at Sinnott Memorial Overlook in Crater Lake National Park. Many of the plaque here deal with the lake's geological history.
Waymark Code: WMYXB3
Location: Oregon, United States
Date Posted: 08/05/2018
Views: 2
Mount Mazama was formed over a period of 400,000 years, but the collapse took only hours or days. During the climatic eruption, much of the mountain feel into the emptied magma chamber below, creating the caldera. The rugged, rocky and potentially active bottom of this caldera is hidden today by Crater Lake.
A New Terminology.
In the mid twentieth century. Geologists refinded the definitions of craters and calderas. A crater is the surface opening a vent that feeds the volcano, such as at the top of Wizard Island. A caldera is a basin many times larger than a crater, often created by a collapse. Crater Lake is actually in a caldera that is about 5 by six miles across and almost 4000 feet deep. The walls we see rise from 500 to nearly 2000 feet above the lake surface.
Historic Topic: Geological
Group Responsible for placement: National Parks Service
Marker Type: Trail
Region: Southern Oregon
County: Klamath
State of Oregon Historical Marker "Beaver Board": Not listed
Web link to additional information: Not listed
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