Brokeoff Volcano Map - Lassen Volcanic National Park
N 40° 27.930 W 121° 30.877
10T E 625928 N 4480484
One of several maps found throughout the park.
Waymark Code: WMHWGH
Location: California, United States
Date Posted: 08/19/2013
Views: 4
The drama of this view is not in what you see, but in what you don't see. Imagine a Mount Shasta-like volcano 11 miles across and towering 11,500 feet tall, filling this view. Some 400,000 years ago such a volcano stood here. The distant mountain peaks-Mount Conard, Brokepff Mountain, Mount Diller, and Pilot Pinnacle-mark the volcano's remnant edge. Diamond Peak (left center in the view) stands near the ancient volcano's core.
When the volcano ceased erupting 400,000 years ago, its slow decay and collapse began. Known as Mount Tehama, or more aptly named Brokeoff Volcano, the volcano simply fell apart over time. Hydrothermal features, like those at Sulphur Works and in Little Hot Springs Valley today, circulated hot, corrosive fluids through the volcano, weakening and softening its porous rock. Glaciers and flowing water further altered and eroded the rock. Bit by bit the volcano's structure was whittled and fell away leaving this valley depression and the resistant skeletal mountain rim you see today.
Location Name: Lassen Volcano National Park
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Visit Instructions:
A photo of either you or your GPS at the site is welcomed but not required.