1. By Hyungbae Park (Tyler) ESS 315
Hebgen Lake Landslide
By Hyungbae Park (Tyler)
ESS 315

2. Overview Also, known as 1959 Yellowstone Earthquake
11:37 pm (MST) on August 17th, 1959
Southwestern Montana, United States
Cause:
Magnitude of 7.5 earthquake for about 40 seconds
Strongest earthquake to hit Montana since Helena earthquake
Worst landslides in the history of Northwestern U.S. since 1927
Damage:
28 deaths
$11 million damage

3. Location

4. Characteristics Type: Rock, Trees, and Debris Avalanches Type of Soil:
15 ft
Type: Rock, Trees, and Debris Avalanches
Type of Soil:
Schistose Bedrock
Sedimentary layer (Dolomite)
Thin layer of foliation
Landslide created a lake as it slid into the valley
Later named Quake Lake
Quake Lake
Quickly filled with water
Growing Quake Lake swept homes and highways
Fault Scarp
Ripped through the camp grounds to the north of the Madison River
The length of the scarp is about 12 miles
Fault Scarp Campground 1959
Fault Scarp in campground 2004

5. Damages Highway 287 Madison River Landslide
Highway 287 & 191 were mostly damaged causing huge cracks
Many people used these roads for fleeing
28 deaths were caused due to Madison slide

6. Building collapse at the Blaneystone Ranch, near Hebgen Lake
A fault scarp near Red Canyon Creek – 5.7 meter displacement from the earthquake
White Ridge of dolomite boulders due to the Madison River landslide
Disrupted trees, roads
& swept house

7. Sources
bWheeler_hebgen.pdf
formed.html
and-landslide