Where was the Gros Ventre landslide?
Kelly, Wyoming
On June 23, 1925, one of the largest fast-moving landslides in generations occurred near the town of Kelly, Wyoming. In just three minutes, huge amounts of rock and debris cascaded down the north slope of Sheep Mountain, changing the area forever.
What happened in the 1925 Gros Ventre Slide in Wyoming?
On June 23, 1925, hurling down the slope at 50 mph, the mile-wide Gros Ventre Slide carried 50,000,000 cubic yards of debris down the mountain and then another 300 feet up the opposite slope. The Slide blocked the Gros Ventre River, and formed a five-mile long body of water known today as Lower Slide Lake.
Why did the Gros Ventre landslide occur?
The landslide occurred on June 23, 1925, following melt from a heavy snowpack, several weeks of heavy rain, and earthquake tremors in the area.
How would you classify the Gros Ventre landslide?
Landslides are prone along failure planes (clay beds and old soils) on these dip slopes. The Gros Ventre landslide is a good example of this. Classifications of different landslides are: Flow, Debris avalanches and Creep. Flows occur when material moves downslope as a thick mass of water and soil.
What factors led to the massive rockslide at Gros Ventre Wyoming?
A combination of three factors caused the rock slide: 1) heavy rains and rapidly melting snow saturated the Tensleep Sandstone causing the underlying shale of the Amsden Formation to lose its shear strength, 2) the Gros Ventre River cut through the sandstone creating an oversteepened slope, and 3) soil on top of the …
What happened in the 1925 Gros Ventre Slide in Wyoming quizlet?
The Gros Ventre Slide occurred as a slump that dammed the Gros Ventre River and created the Lower Slide Lake. Which of the following was primarily responsible for this famous event? Shale A was responsible for the failure because it was mechanically weak and dipped in a downslope direction.
Is the best example of landslide?
1980, Mount Saint Helens, Washington: On May 18, 1980, a 5.1-magnitude earthquake triggered the largest landslide observed in the historical record. This landslide was followed by the lateral eruption of Mount Saint Helens volcano, and the eruption was followed by volcanic debris flows known as lahars.
What is an example of landslides?
An example of a landslide is when heavy rains cause dirt and earth to fall rapidly down a cliff, sometimes even carrying buildings down with them. An example of a landslide is when a candidate wins by 100 to 1.
What are the six 6 major landslide triggering mechanism?
The most common natural landslide triggers are described in this chapter, including intense rainfall, rapid snowmelt, water-level change, volcanic erup- tion, and earthquake shaking, and examples are pro- vided in which observations or measurements have documented the relationship between triggers and landslides.
What factors increase the risks of landslides?
Landslides can be initiated in slopes already on the verge of movement by rainfall, snowmelt, changes in water level, stream erosion, changes in ground water, earthquakes, volcanic activity, disturbance by human activities, or any combination of these factors.
