3- Hazards Of Intermediatr And Felsic Volcanoes Flashcards
1
Q
Plinian eruption hazards
A
Ash cloud Pyroclastic cloud Ash and plumice fall Lahar Lava flow Poisonous gas
2
Q
Ash and pumice fall
A
Most fatal
Formed by volatile rich eruptions
Hazards: volcanic bombs, asphyxiation, burial, roof collapse, PGA, water contamination, kills vegetation
3
Q
Ash Clouds
A
Effect airplanes
Climate change- troposphere (trap sunlight: regional warming)
Stratosphere (reflects sunlight to space: global cooling)
4
Q
Pyroclastic flow
A
Fire fragment
Gravity driven hot clouds of ash, pumice rock that roll to ground
Confined to volcano and slopes
Produced by collapse of eruption column
Associated volcanoes: composite, calderas
Hazards: incinerate everything, catastrophe for towns, travel land and water
5
Q
Lahars
A
Water and volcanic material Volcanic mudflow Water source: rain/snow/river/glacier Volcanic material: tephra -viscosity of wet cement Travel far, confined to valley Associated volcanos: composite cones Hazards= hot or cold, may continue for years
6
Q
Poisonous gases
A
Associated volcanoes: all
Hazards= co2 lethal in high concentration, so2 with water forms acid rain
