disasters10.26notes

disasters10.26notes - 1 9.1 Ch 9 Volcano Case Histories...

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1 9.1: Ch. 9 – Volcano Case Histories: Killer Events Date:_________ Killer Events and Processes: volcanoes can kill in numerous ways, as they can burn you in a pyroclastic flow , slam and suffocate you with a lahar , batter and drown you with tsunami , poison you with gas , hit you with a pyroclastic bomb , fry you with a lava flow , and kill you with indirect events such as famine . Volcano Prediction: volcanologists can make long-term forecasts based on past history and once activity begins , can warn of an impending eruption, but at the current time, predicting a volcanic eruption in advance is not possible . Volcano Mitigation: a volcano may be active for millions of years, but centuries may pass between individual eruptions. The time scale of an active volcano must be considered by people living nearby. Signs of Impending Eruption: (1) seismic waves are created as magma rises, causing rocks to snap and break, and as magma moves through conduits and fills the magma chamber; (2) ground deformation as the surface rises up and sinks down as magma moves up or withdraws; (3) gas measurements of CO2 and SO2 , as both dissolved gases escape from magma nearing the surface; increasing SO2
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  • Fall '09
  • landin
  • Volcano, Vesuvius, pyroclastic flows, Volcano Case Histories, impending eruption, resurgent caldera eruption

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disasters10.26notes - 1 9.1 Ch 9 Volcano Case Histories...

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