1. Volcanism Volcanic Features Location and Types of Volcanic Activity
Effusive Eruptions  
Explosive Eruptions  
Volcano Forecasting and Planning

2. Volcanic Settings
Figure

3. Shield and Composite Volcanoes
Figure

4. 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

6. FLOOD BASALTS

7. Composite Volcano
Columbia River basalt flow

8. 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

9. Composite Volcanoes
Figure

11. 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.

12. 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.