Types of volcanoes composite volcanoes

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Types of Volcanoes Composite Volcanoes (Stratovolcanoes) are built up of layers of lava and pyroclastics – Mix of lavas and pyroclastic layers allows for a tall volcano to form – Usually associated with subduction zones – These tend to be violent and explosive – Example: Mount St. Helens, Cascade Range, Northwest U.S.A.
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Stratovolcanoe
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Andesitic eruption: Stratovolcano
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Caldera Formation
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Hazards Related to Volcanoes Lava , the principal hazard. But not life-threatening generally Pyroclastics , more dangerous than lava flows Lahars , a volcanic ash and water mudflow Pyroclastic Flows - Nuées Ardentes (hot avalanches) Toxic Gases Ash Falls Steam Explosions Secondary Effects ; Climate and Atmospheric Chemistry Tsunamis (phreatic explosion), land slides, earthquakes
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Hazards Related to Volcanoes Lava , the principal hazard. But not life-threatening generally Pyroclastics , more dangerous than lava flows Lahars , a volcanic ash and water mudflow Pyroclastic Flows - Nuées Ardentes (hot avalanches) Toxic Gases Ash Falls Steam Explosions Secondary Effects ; Climate and Atmospheric Chemistry Tsunamis (phreatic explosion), land slides, earthquakes
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Predicting Volcanic Eruptions Classification by activity Active : erupted in recent history Dormant : no historic erupts but not badly eroded Extinct : no historic eruptions and badly eroded Volcanic Precursors – Seismic activity – Bulging, tilting or uplift – Monitoring gas emissions around volcano
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- Collection of geologic evidence of past activity, - Seismic activity (tremors), - Changes in magnetic, thermal, hydrologic, and geochemical conditions, - Topographic monitoring, - Monitoring of volcanic gases Prediction of Volcanic Activity
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Indicators of magma motion toward surface
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Tilt of the Earth Surface
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  • Fall '19
  • Volcano, Mantle, Cascade Volcanoes, Cinder Cones, • Pyroclastics, Volcanoes Formation

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