geology

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Hazards

Risk

Rainier

Hood

Crater Lake

SCORE

THREAT SCORE = HAZARD SCORE x RISK SCORE

Rainier

Hood

Crater Lake

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.

Hazards

Volcano is a stratocone/stratovolcano, lava dome, complex volcano, maar, or caldera

Maximum known VEI ≥ 3

Maximum known VEI ≥ 5

Maximum known VEI ≥ 7

VEI 3+ eruption within the past 500 years

VEI 4+ eruption within the past 5,000 years

Pyroclastic flows within last 10,000 years

Mudflows (lahars) within the last 10,000 years

Destructive tsunami within last 10,000 years

Occurrence of frequent volcano-seismic crises (volcanic earthquake swarms)

Occurrence of significant ground deformation within last 50 years

SCORE

Risk

St. Helens

Lassen

Shasta

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)

Volcano within 300 km of a passenger airport

Volcano within 300 km of an international airport

SCORE

THREAT SCORE = HAZARD SCORE x RISK SCORE

St. Helens

Lassen

Shasta

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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