Which of the following statements about the deadly Oso landslide is untrue?
Nova's Killer Landslides is a very real and informative overview of this event, which is the type of landslide that residents along the west coast of North America should expect. Be sure to read ALL the fine print and hire a geologist for consult BEFORE purchasing a home.
a. This earth material came off the wall and travelled across the valley in 138 seconds
b. The seismic signal of shaking during the event indicated 2 pulses of flow
c. Covered a 1-mile wide stretch of HWY 530
d. Debris and dirt in the 600 ft high slope spread for an entire mile across the valley
e. The sediments that rapidly slid downslope, destroying vehicles, roadways, and homes, were not saturated with water.
Which of the following factors factor bear on the likelihood of a landslide?
a. All of these
b. Slope steepness
c. Degree of weathering
d. Amount of water
If a landslide on a slope blocks or dams a river, which feature will form near the toe of the slide soon thereafter?
a. high ridges on the toe of the slide
b. a lake
c. an unconsolidated gaping chasm and scarp at the head of a landslide