geology

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.