TECTONIC ENVIRONMENTS OF VOLCANISM. Ocean Plate/Continental Plate Convergence: Stratovolcanoes on a Continental Margin.

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Presentation transcript:

TECTONIC ENVIRONMENTS OF VOLCANISM

Ocean Plate/Continental Plate Convergence: Stratovolcanoes on a Continental Margin

ANDES MOUNTAINS

Ocean Plate/Ocean Plate Convergence: Volcanic Island Arcs

Mt. Pinatubo: The Philippene Islands

Mt. Vesuvius

Divergent Plate Boundaries: Spreading Ridge Volcanism

ICELAND

HOT SPOT VOLCANOES

Mauna Kea: A Shield Volcano

Stratovolcano Shield Volcano

Olympus Mons: Mars

VOLCANO ERUPTION PREDICTION: 1.Volcanologists need to use scientific information to accurately predict eruptions. 2.Communicate information effectively to government and local officials. 3.Eruption predictions will help save life and property.

HOW DO GEOLOGISTS PREDICT ERUPTIONS? 1. Doming and Tilting:

HOW DO GEOLOGISTS PREDICT ERUPTIONS? 2. Seismicity: Changes in the number of earthquakes. 3. Changes in gas emissions: Example – There is an increase in the amount of hydrogen gas emitted before Kileaua erupts. 4. Periodicity: Cycles of eruptions

What can we do with predictions?  Hazard Maps  Evacuations

VOLCANIC HAZARDS IN THE UNITED STATES Mt. Ranier – Lahar Hazard