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Lecture 9: Volcanic Hazards Our Hazardous Environment GEOG 1110 Dr. Thieme.

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Presentation on theme: "Lecture 9: Volcanic Hazards Our Hazardous Environment GEOG 1110 Dr. Thieme."— Presentation transcript:

1 Lecture 9: Volcanic Hazards Our Hazardous Environment GEOG 1110 Dr. Thieme

2 Volcanic Hazards gases 2 CO 2 SO 2 H 2 S F 2 lava flows bombs, ash pyroclastic flows landslides mudflows (“lahars”)

3 Molten Sulfur and Sulfur Gases in an Indonesian volcano

4 Lake Nyos, Cameroon, West Africa

5 Carbon Monoxide (CO) is poisonous

6 Mt Unzen, Japan 1991 eruption pyroclastic flows killed 43 more than 600 homes and one school destroyed claimed the lives of volcanologists Maurice and Katya Kraft

7 Pyroclastic Flow (nuée ardentes)

8 Pyroclastic Flows along the Mitzunashi River

9 A lahar triggered by rainfall on the Nima II River in Guatemala. The lahar developed on the slopes of Santiaguito volcano

10 Damage caused by a lahar on the Toutle River triggered by the Mount St. Helens eruption in Washington state.

11 Pompeii - pyroclastic flows killed over 16,000

12 High Risk in Cascade Mtns High Risk in Yellowstone Moderate Risk in Areas of Southwest Caldera eruption could impact entire U.S.

13 06.13.a-d How Do We Monitor Volcanoes? Increased seismic activity Increased gas activity Changes in topography Changes in temperature

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15 Volcanoes and climate Explosive eruptions emit huge quantities of gases and fine-grained debris into the atmosphere which filter out and reflect a portion of the incoming solar radiation Examples of volcanism affecting climate Mount Tambora, Indonesia – 1815 Krakatau, Indonesia – 1883 Mount Pinatubo, Philippines


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