USGS/Cascades Volcano Observatory, Vancouver, Washington
REPORT:
Catastrophic Debris Flows Transformed from Landslides in Volcanic Terrains: Mobility, Hazard Assessment and Mitigation Strategies
--
Scott, K.M., Macías, J.L., Naranjo, J.A., Rodriguez, S., and McGeehin, J.P., 2001,
Catastrophic Debris Flows Transformed from Landslides in Volcanic Terrains: Mobility, Hazard Assessment and Mitigation Strategies:
U.S. Geological Survey Professional Paper 1630
Table of Contents
- Abstract
- Introduction
- Sediment terminology - size and texture
- Landslides and volcano collapses
- Debris avalanches
- Debris flows
- Acknowledgments
- "La avalancha" in the Río Páez, Colombia -- an archetypal seismogenic debris flow in volcanic terrain
- Formation of "la avalancha"
- Dynamics of "la avalancha"
- Velocity of the wave front
- Cross-sectional area and discharge
- Flow hydrograph - the rise
- Flow hyrdograph - the recession
- Formation of the single wave
- Flow mobility
- Other debris flows transformed from landslides in volcanic terrains
- Rainfall-triggered debris flows
- Earthquake-triggered debris flows
- Mexico, 1920
- Chile, 1960
- Ecuador, 1987
- Debris flows from landslides and volcano collapses -- triggering mechanisms
- Magmatic destabilization
- Rainfall
- Earthquakes
- Gravity
- Hydrovolcanic activity (phreatic and phreatomagmatic)
- Triggering mechanisms related to possibility of pre-event warning
- Recognition of volcanic debris avalanches and cohesive debris flows (lahars) from deposits
- Longitudinal transformations and textural changes
- Interpreting flows and their behavior from their deposits
- Examples from Mount Rainier
- Examples from New Zealand
- Debris flows from landslides and volcano collapses - flow mobility
- Debris flows from landslides and volcano collapses - extrapolating case histories
- Forensic documentaion of flow pathways - Past events and future predicitons
- Hazard assessments
- Risk analysis - Example of Mount Rainier
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10/25/04, Lyn Topinka