Landslide

1. Which of the following was so unusual about the Oso landslide?

Select one:

a. 

Debris and dirt in the 600 ft high slope spread for an entire mile across the valley

b. 

The seismic signal for the event indicated 2 phases of flow

c. 

Covered a 1-mile wide stretch of HWY 530

d. 

This earth material came off the wall and travelled across the valley in 138 seconds

 

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