Transcript Document 7699652

Volcanic Hazards
Primary Effects
-lava flows
-pyroclastic eruptions
-poisonous gas emissions
Secondary Effects
-mudflows and debris avalanches
-flooding (glacial outburst floods)
-tsunamis
-seismicity
-atmospheric effects and climate change
Volcanic Hazards along the Cascadia Subduction Zone
Predicting Eruptions
Monitoring the Movement of Magma
-seismic studies
-magnetic field changes
-electrical resistivity
Physical Anomalies and Precursor Phenomena
-ground deformation
-change in heat output
-change in the composition of gases
-local seismic activity
Volcanic Hazards
Primary Effects
-lava flows
-pyroclastic eruptions
-poisonous gas emissions
Secondary Effects
-mudflows and debris avalanches
-flooding (glacial outburst floods)
-tsunamis
-seismicity
-atmospheric effects and climate change
Volcanic Hazards along the Cascadia Subduction Zone
Predicting Eruptions
Monitoring the Movement of Magma
-seismic studies
-magnetic field changes
-electrical resistivity
Physical Anomalies and Precursor Phenomena
-ground deformation
-change in heat output
-change in the composition of gases
-local seismic activity
Aa Flow, Hawaii
Pahoehoe Flow, Hawaii
Basaltic lava flow, Hawaii.
Lava flow induced fire, Hawaii.
Landslide north face of Mt. St. Helens May 18, 1980.
Mt. St. Helens May 18, 1980
Mount St. Helens: Pyroclastic flow May 18, 1980.
Pompeii, Italy 79AD
Tephra distribution from Mt. Mazama,
Longvalley and Yellowstone eruptions.
Tephra distribution of Cascade volcanoes
Isopachs of Glacier Peak tephra distribution (13,100 yr BP).
Isopachs of Glacier Peak tephra distribution (13,100 yr BP).
Volcanic Hazards
Primary Effects
-lava flows
-pyroclastic eruptions
-poisonous gas emissions
Secondary Effects
-mudflows and debris avalanches
-flooding (glacial outburst floods)
-tsunamis
-seismicity
-atmospheric effects and climate change
Volcanic Hazards along the Cascadia Subduction Zone
Predicting Eruptions
Monitoring the Movement of Magma
-seismic studies
-magnetic field changes
-electrical resistivity
Physical Anomalies and Precursor Phenomena
-ground deformation
-change in heat output
-change in the composition of gases
-local seismic activity
Causal Factors for Lahar Flows
Lahar flows from Mt. Pinatubo, Phillipines.
Mt. Rainier’s glacial ice is a major
potential source
Oceola Lahar (~5200 yr BP) near Enumclaw, WA.
Unconsolidated pyroclastic deposits on north face of
Mt. St. Helens source of lahar flows.
Reworked pyroclastics incorporated into Mt. St.
Helens lahar deposits.
Volcanic Hazards
Primary Effects
-lava flows
-pyroclastic eruptions
-poisonous gas emissions
Secondary Effects
-mudflows and debris avalanches
-flooding (glacial outburst floods)
-tsunamis
-seismicity
-atmospheric effects and climate change
Volcanic Hazards along the Cascadia Subduction Zone
Predicting Eruptions
Monitoring the Movement of Magma
-seismic studies
-magnetic field changes
-electrical resistivity
Physical Anomalies and Precursor Phenomena
-ground deformation
-change in heat output
-change in the composition of gases
-local seismic activity