After the Collapse

After the Collapse (HM16W0)

Location: CRATER LAKE, OR 97604 Klamath County
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Country: United States of America
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N 42° 54.78', W 122° 8.496'

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Mount Mazama

— Crater Lake National Park —

About 6,800 years ago, at the climax of a series of dramatic eruptions, the top of Mt. Mazama collapsed. Left behind was the huge crater, or caldera, you see today. But before the caldera filled with water, there were more eruptions.

The most striking evidence of post collapse volcanic activity is Wizard Island, the small volcano in front of you. Its symmetrical cone was formed by a fountain of cinders which erupted from the caldera floor. On the left side of the caldera, a similar cone appeared, but today it lies hidden 496 feet (151 m) below the lake surface.

Geologists believe that lava flows which erupted after the collapse helped to seal the fractured caldera floor, allowing melting snow and rain to accumulate.
HM NumberHM16W0
Placed ByNational Park Service
Marker ConditionNo reports yet
Date Added Friday, October 10th, 2014 at 11:50pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)10T E 570065 N 4751511
Decimal Degrees42.91300000, -122.14160000
Degrees and Decimal MinutesN 42° 54.78', W 122° 8.496'
Degrees, Minutes and Seconds42° 54' 46.80" N, 122° 8' 29.76" W
Driving DirectionsGoogle Maps
Area Code(s)541
Closest Postal AddressAt or near 1100-1146 Rim Dr, CRATER LAKE OR 97604, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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