Lecture 7: Volcanic Threat
Mt. Baker
Hazards
Hazard Rating Score
High silica content of eruptive products, >60% (andesite/dacite/rhyolite)
Major explosive activity within last 500 years
Major explosive activity within last 5000 years
Pyroclastic flows within last 500 years
Mudflows (lahars) within the last 500 years
Destructive tsunami within last 500 years
Occurrence of frequent volcano-seismic crises (volcanic earthquake swarms)
Occurrence of significant ground deformation within last 50 years
SCORE
Risk
Risk Rating Score
Population at risk >100
Population at risk >1,000
Population at risk >10,000
Population at risk >100,000
Population at risk >1,000,000
Historical fatalities
Evacuation as a result of historical eruption(s)
SCORE
TOTAL SCORE ___________
For each of the above queries to which the answer is yes, score 1. For an answer of no, score 0.
If no information is found, assume the answer is no and score 0.
Mt. Hood
Hazards
Hazard Rating Score
High silica content of eruptive products, >60% (andesite/dacite/rhyolite)
Major explosive activity within last 500 years
Major explosive activity within last 5000 years
Pyroclastic flows within last 500 years
Mudflows (lahars) within the last 500 years
Destructive tsunami within last 500 years
Occurrence of frequent volcano-seismic crises (volcanic earthquake swarms)
Occurrence of significant ground deformation within last 50 years
SCORE
Risk
Risk Rating Score
Population at risk >100
Population at risk >1,000
Population at risk >10,000
Population at risk >100,000
Population at risk >1,000,000
Historical fatalities
Evacuation as a result of historical eruption(s)
SCORE
TOTAL SCORE ___________
For each of the above queries to which the answer is yes, score 1. For an answer of no, score 0.
If no information is found, assume the answer is no and score 0.
Mt. Rainier
Hazards
Hazard Rating Score
High silica content of eruptive products, >60% (andesite/dacite/rhyolite)
Major explosive activity within last 500 years
Major explosive activity within last 5000 years
Pyroclastic flows within last 500 years
Mudflows (lahars) within the last 500 years
Destructive tsunami within last 500 years
Occurrence of frequent volcano-seismic crises (volcanic earthquake swarms)
Occurrence of significant ground deformation within last 50 years
SCORE
Risk
Risk Rating Score
Population at risk >100
Population at risk >1,000
Population at risk >10,000
Population at risk >100,000
Population at risk >1,000,000
Historical fatalities
Evacuation as a result of historical eruption(s)
SCORE
TOTAL SCORE ___________
For each of the above queries to which the answer is yes, score 1. For an answer of no, score 0.
If no information is found, assume the answer is no and score 0.
Mt. St. Helens
Hazards
Hazard Rating Score
High silica content of eruptive products, >60% (andesite/dacite/rhyolite)
Major explosive activity within last 500 years
Major explosive activity within last 5000 years
Pyroclastic flows within last 500 years
Mudflows (lahars) within the last 500 years
Destructive tsunami within last 500 years
Occurrence of frequent volcano-seismic crises (volcanic earthquake swarms)
Occurrence of significant ground deformation within last 50 years
SCORE
Risk
Risk Rating Score
Population at risk >100
Population at risk >1,000
Population at risk >10,000
Population at risk >100,000
Population at risk >1,000,000
Historical fatalities
Evacuation as a result of historical eruption(s)
SCORE
TOTAL SCORE ___________
For each of the above queries to which the answer is yes, score 1. For an answer of no, score 0.
If no information is found, assume the answer is no and score 0.
Mt. Shasta
Hazards
Hazard Rating Score
High silica content of eruptive products, >60% (andesite/dacite/rhyolite)
Major explosive activity within last 500 years
Major explosive activity within last 5000 years
Pyroclastic flows within last 500 years
Mudflows (lahars) within the last 500 years
Destructive tsunami within last 500 years
Occurrence of frequent volcano-seismic crises (volcanic earthquake swarms)
Occurrence of significant ground deformation within last 50 years
SCORE
Risk
Risk Rating Score
Population at risk >100
Population at risk >1,000
Population at risk >10,000
Population at risk >100,000
Population at risk >1,000,000
Historical fatalities
Evacuation as a result of historical eruption(s)
SCORE
TOTAL SCORE ___________
For each of the above queries to which the answer is yes, score 1. For an answer of no, score 0.
If no information is found, assume the answer is no and score 0.
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