You are inside a volcano - Crater Lake, OR
Posted by: Groundspeak Premium Member saopaulo1
N 42° 54.696 W 122° 08.575
10T E 569960 N 4751354
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: WMYXBC
Location: Oregon, United States
Date Posted: 08/05/2018
Published By:Groundspeak Premium Member Volcanoguy
Views: 2

"Mount Mazama with its Crater Lake, is one of a thousand potentially active Volcanoes that ring the Pacific. For nearly half a million years, the great 12000 foot volcano stood here with its summit 5000 feet above the spot when you are standing! It was composed of an irregular complex of volcanic cones and domes. The landmarks on the caldera rim are the surviving remnants of these features.

What happened here? The mountain issued a number of warnings of the pending eruption in the preceding centuries. Lava flowes and smaller eruptions were evidence of thr active turmoil beneath Mount Mazama. During its cataclysmic eruption nearly 8000 years ago, about 12 cubic miles of magma erupted out and dispersed thousands of miles to the northeast. An equal amount of material collapsed from the summit , forming a caldera. In today's terms, 12 cubic miles of material would be enough to cover Oregon eight inches deep in ash."
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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OregonTrailRanger visited You are inside a volcano - Crater Lake, OR 11/27/2020 OregonTrailRanger visited it