1. How do floods relate to landslides? Do landslides cause floods? Explain. 2. E
ID: 294924 • Letter: 1
Question
1. How do floods relate to landslides? Do landslides cause floods? Explain.
2. Explain why both the 15-day and 3-day cumulative precipitation levels are critical in determining when landslides might occur.
3. Why might landslides not occur after even several inches of rain over 3 days if the amount of rain in the preceding 2 weeks has been low?
4. Why would landslides not occur even if there had been a large amount of rain in the previous 2 weeks, but little rain in the last 3 days?
5. In early 1997 there were indeed many landslides around Puget Sound. Many of these occurred in the glacial sediment that covers bedrock in the region. Landslides were particularly common in or near the transitional zone between a glacial outwash sand unit (the Esperance Sand) and the underlying glacial lacustrine unit (the Lawton Clay). Explain, in detail, why you think a stratigraphy of sand overlying clay is a particular landslide hazard.
6. Excessive precipitation is not the only trigger for landslides in Puget Sound. Explain how the incidence of landslides is related to earthquake hazard in the region.
Explanation / Answer
1)Rivers creates a significant amount of erosion over time but floods cause erosion to happen very quickly acting like powerful rivers.Floods can trigger landslides as it's heavy and adds extra weight to the land which makes that slope materials succumb to the forces of gravity.
In a landslide the masses of rock or debris move down a slope which can be small or large, slow or rapid. Landslides cannot initiate floods as they are themselves activated by floods,storms, earthquakes, volcanic eruptions and the modification of land by humans.
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