Volcanism
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Volcanism. Volcanic Features   Location and Types of Volcanic Activity   Effusive Eruptions   Explosive Eruptions   Volcano Forecasting and Planning. Volcanic Settings. Figure 12.24. Shield and Composite Volcanoes. Figure 12.32. EFFUSIVE ERUPTIONS.

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Volcanism

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Volcanism

Volcanism

  • Volcanic Features  

  • Location and Types of Volcanic Activity  

  • Effusive Eruptions  

  • Explosive Eruptions  

  • Volcano Forecasting and Planning


Volcanic settings

Volcanic Settings

Figure 12.24


Shield and composite volcanoes

Shield and Composite Volcanoes

Figure 12.32


Effusive eruptions

EFFUSIVE ERUPTIONS

  • Generally at hots spots, spreading centers

  • Mantly comes directly to surface

  • Hot lava; low viscosity, very mafic, flows easily, gases escape easily

  • Forms shields, flood basalts


Volcanism

FLOOD BASALTS


Volcanism

Composite Volcano

Columbia River basalt flow


Explosive eruptions

EXPLOSIVE ERUPTIONS

  • Found at subduction zones

  • Magma low temp (800 degrees C), high viscosity, does not flow easilty, more felsic mineralogy, gases trapped, hard to predict explosions

  • Forms composite volcanoes, cinder cones, calderas, aerial bombs, nuee ardente gas flows, very destructive


Composite volcanoes

Composite Volcanoes

Figure 12.34


Volcanism

Nuee ardente: pyroclastic flow, of searing superheated gas and incandescent volcanic ash and dust

Mount Pelee, on the Carribean island of Martinique, 1902 eruption. All but 2 of the more than

20,000 people in the town of St. Pierre were killed.


Volcanism

KRAKATAU: World’s largest explosion?

Over a century ago, on August 26,1883, the island volcano of Krakatau ("Krakatoa") in Indonesia,

a virtually unknown volcanic island with a history of violent volcanic activity, exploded with

devastating fury. The eruption was one of the most catastrophic natural disasters in recorded history.

The effects were experienced on a global scale. Fine ashes from the eruption were carried by upper

level winds as far away as New York City. The explosion was heard more than 3000 miles away.

Volcanic dust blew into the upper atmosphere affecting incoming solar radiation and the earth's

weather for several years. A series of large tsunami waves generated by the main explosion, some

reaching a height of nearly 40 meters (more than 120 feet) above sea level, killed more than 36,000

people in the coastal towns and villages along the Sunda Strait on Java and Sumatra islands.

Tsunami waves were recorded or observed throughout the Indian Ocean, the Pacific Ocean, the

American West Coast, South America, and even as far away as the English Channel.


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