lecture 14

Question 1

oslo landslide

Answer 1

deadliest ladnslide in history

• started as a debri slide from previous deposits
• 35 residents buried, 43 killed, both debri and rock

Question 2

precondition of oso landslide

Answer 2

toe of slope is unstable b/c inscision of river into valley

rain saturated and weakened soil making it heavy and less stable

Question 3

analysis of pre 2014

Answer 3

lidar imagery revealed that an earlier, smaller landslide in 2006 also destabalized slope
- numerous scars and deposits

Question 4

ground vibrations

Answer 4

generated and recorded by nearby seismic stations

- shows 2 stages of landslide

Question 5

montecito mudflows

Answer 5

vegetation acted as hillside soil stabilizers, healthy topsoil has burrowing animals that raises porosity allowing rain to pass through
- vegetation removed by wildfires leaves ash and clay with less porosity and doesnt absorb water as well causing flooding

Question 6

mt meager landslide

Answer 6

group of volcanic peaks in garibalid volcanic belt

• rock is weak from hydorthermal activity
• composite landslide started as rock fall then became avalanche then debris flow

Question 7

seismometers of mt meager landslide

Answer 7

timing of landslide including initial impact, debris flow in capricorn creek and impact with meager creek