Mass Movement Flashcards
What is regolith
A blanket of dust, broken rocks and other materials covering solid rock
How does an undercut happen
It happens when regolith becomes unstable due to undercutting by human activity or water
What is a mudflow
A wet or hard stream or avalanche of mud caused by heavy rain or a sudden thaw
What is a landslide
- A landslide is the sudden movement of rock, soil, & debris down a slope due to gravity
- Cause- heavy rainfall, deforestation, human activities
Is a landslide fast or slow
Fast
What is Pete
Material formed by partial decomposition of organic matter, from swamps, bogs and turf
Where does a bog burst occur
Upland areas
Types of mass movement
Avalanche, soil creep, slump, mudflow/bogbursts, earth flow, rockslide, rockfall
Name factors that influence mass movement
- Deforestation, heavy rainfall, human activities
- steep cut slopes, removed material, road surface, steep filled slope
Is soil creep fast or slow
Very slow
Is a bog burst fast or slow
Slow-fast
Is a mudflow slow or fast
Fast
Is an avalanche fast or slow
Fast
When did the montecito landslide occur
2018
How did the 2018 montecito landslide occur
Heavy rainfall in areas where deforestation recently occurred after the Thomas Forest Fires from 2017, after heavy rainfall left the soil unstable
What did the 2018 montecito landslide trigger
This triggered a fast-moving landslide destroying homes, roads, & infrastructure in Montecito and many injuries
How much people died in the 2018 montecito landslide
23 people
What are the steps called when soil creep occurs
Terracettes
Name 2 reasons you know soil creep has occurred
- Trees growing at an angle
- steps called terracettes
Name 2 types of slow mass movement
-Bog bursts
- Soil creep
Name 2 types of fast mass movement
-Avalanches
-Landslide
