Lahars Flashcards
1
Q
Lahars
A
Hot and cold mixture of water, soil, and rock fragments that flow down slopes of a volcano.
2
Q
Lahar Deposits
A
Contain many dark angular rock fragments.
They are not always originally from volcanoes.
3
Q
Causations of Lahars
A
- During an Eruption: melting of snow and ice by pyroclastic flows.
- After Eruption: heavy rainfall which mobilizes freshly deposited material.
- Without Eruption: Sudden landslides, earthquakes
4
Q
Flavors of Lahars
A
- Debris Flow
- Mudflow
- Hyperconcentrated Streamflow
- Cohesive Lahars
- Non-Cohesive Lahars
5
Q
What tragedy is associated with Lahars?
A
1985 Amero-Nevado del Ruiz (highest Colombian volcano with historic activity)
6
Q
Real Time Warning for Lahars
A
AFM (Acoustic Flow Monitors) in which signals are made from loud flow/movement (sound)
7
Q
Mt. Rainier’s Lahars
A
Nine large Lahars in 5600 years; 40 AFMs
