|
|
A virtual world in 1699 images (213,296 worldwide)
See this sign in context.
Avalanche Boulders
The Devastated Area was formed by a volcanically
triggered avalanche and mudflow on May 19, 1915
and by the pyroclastic flow and mudflows on May
22, 1915.
The large black dacite boulders on this hillside are
pieces of a small dome that filled the crater on top
of Lassen Peak between May 14 and 19, 1915.
During the eruption, this dome was torn apart and
the fragments were thrown out onto the steep
snow-covered slopes. Melting snow slid down the
mountain entrapping these boulders in a fast-
moving avalanche. Tumbling and rolling on smaller
rocks and pebbles, these sizzling 50 to 100 ton
boulders came to rest on this hillside.
This sign is found along a route which has been photographed for inclusion in
the UntraveledRoad virtual world. To see and follow the route this sign
is on, click on its image.
|
In Lassen Park:
You are in:
Services:
|
Copyright 1999-2008 UntraveledRoad *
Home
Lassen Park Virtual Travel