PHY 105 4-2

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Southern New Hampshire University *

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105

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Geography

Date

Apr 3, 2024

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docx

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Uploaded by SuperFlowerAnteater39

Assignment 4-2 Part 1: Question 1: The Oso mudslide occurred on March 22, 2014. The debris from the slide was sent south-southeast, but the sediment traveled west down the river. Question 2: The geological feature that was affected was the North Fork Stillaguamish River. The river has already corrected its path close to what it was before the slide. The increased sediment has created shoals and sandy beaches downstream from the event. It is difficult to tell but it also looks like the river is slightly wider than it was prior to the event which could indicate it is shallower than before. Question 3: I do not think they were being honest. They may have known it was possible or they may not have been paying attention but there were certainly indications that the shelf was unstable. Between 12/2005 and 4/2006, there was a slide in the same location that redirected the river. This fact alone shows that the hillside was unstable. It was probably understood at this point by anyone who was paying attention that periods of heavy rain could further weaken the area and lead to future landslides. Unfortunately for the people who lost their lives in the slide, the previous month had seen nearly double the amount of rain than was average for that area. Part 2: Question 1: The slope failure appears to have started around 40°32’07.27” N 112°08’24.72” W. Question 2: From the top of the impacted area to the bottom measured approximately 2.68 kilometers. Question 3: There are two smaller slides from 2011 on the west side of the mine and a smaller slide on the east side in 2022. Part 3: Question 1: According to the slider, the avalanche took place between12/30/2012 and 1/2/2013 but according to the NASA Earth Observatory, the event took place on 1/21/2013. Question 2: The topography near the failure point was steep and jagged. Downslope, the topography was much more gradual. This explains the sharp initial avalanche near the top and the slower creep near the bottom.

Question 3: The material fell approximately 1.4 kilometers from the initial failure point.

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