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Volcanoes and society

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Page 1: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Volcanoes and society

Page 2: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Location• Usually at plate boundaries• At hot spots

• The ring of fire is the coastal regions around the pacific ocean where plates are moving, creating volcanoes.

Page 3: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Risks

• Ash and tephra• Rocks• Sun is blocked out.• Climatic changes• Pyroclastic flows• Lahars• Earthquakes• Lava

http://www.geo.mtu.edu/volcanoes/hazards/primer/images/volc-images/augustine033186.jpg
Page 4: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Volcanic ash and gasses

• SO2 Sulfur dioxide, is a deadly gas.

• CO2 Carbon dioxide.• Water vapor (HOT).• Tiny molten silica (glass).• Ash consists of tiny jagged pieces of rock and glass. • Ash is hard, abrasive, mildly corrosive, conducts

electricity when wet, and does not dissolve in water.

• Ash is spread over broad areas by wind.

Page 5: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Bombs and other debris

• LARGE objects usually really hot thrown from volcano.

http://en.wikipedia.org/wiki/File:VolcanicBombMojaveDesert.JPG
Page 6: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Flows and Lahars

• Pyroclastic flows are fast-moving current (450mph) of superheated (1400oF)

• Lahars are mudslides created when ice is melted from the eruption and flows down the slope.

Page 7: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Earthquakes

• Before an eruption earthquakes increase in size and numbers.

Page 8: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Climate changes• The ash and debris from the eruption is shot

into the upper atmosphere (50 miles!) and the winds carry that ash around the world.

• Lowers temperatures (blocks out the sun), and creates storm systems.

Page 9: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Prevention

• No real accurate prevention. • When the pressure builds it will release it

somehow.

Page 10: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Predictions

• Can we predict, Yes. It is like predicting the weather!

• Scientists use earthquake swarms to predict a possibility of an eruption.

• The lava dome inside the volcano is observed, if it builds then pressure is increasing.

Page 11: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Protection

• Knowledge!• The land around the volcano is very fertile, but

unpredictable.• Know routes out of the area.• Have a plan.• Have a supply kits in the home.

• If it happens and your in the way most likely there isn't much you can do.

Page 12: Volcanoes and society. Location Usually at plate boundaries At hot spots The ring of fire is the coastal regions around the pacific ocean where plates

Major past events

• 1980 Mt. St Helens (Washington,USA)• 2010 Eyjafjallajökull (Iceland)• 1991 Mt. Pinatubo (Philippines)• 1982 El Chicho (Mexico)• 1883 Krakatoa (Indonesia)• 1815 Tambora (Indonesia)• 1630 BC Santorini (Greece)• 79 AD Vesuvius (Italy)

http://en.wikipedia.org/wiki/File:Santorini_Landsat.jpg

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