What are the characteristics of a Stratovolcano?
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- interbedded lava flows, pyroclastic flows, lahars
- usually intermediate or felsic
- frequently explosive, often viscous magma
- may erupt many times and stay active for 100,000 years
- usually relatively tall and somewhat wide
What are the characteristics of felsic lava?
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, - high gas content
- high viscosity
- explosive eruptions
- dangerous
What are 4 types of extrusive rock types and their composition?
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1. Basalt: dark colour, mafic, hot magma, low viscosity, non-explosive
2. Andesite: darkish colour, maficish, hotish, lower viscosity, not likely to
explode
3: Dacite: lightish colour, felsicish, cooler, higher viscosity, potential to
explode
4. Rhyolite: light colour, felsic, cold magma, high viscosity, explosive
What are lahars?
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Volcanic mud flow that consist of water and loose volcanic debris
What are felsic rocks?
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Rocks high in silica levels, light in colour, high viscosity
, How does one make a hazard map?
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1. map volcanic deposits
2. determine deposit type
3. determine age of deposits and eruption frequency
4. consider the risk
What are the characteristics of a Plinian eruption?
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- andesitic/rhyolitic ash
- violently explosive
- pyroclastic flows
- ash plume
- volcanic ash rain
What are some triggers of landslides?
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- earthquakes, snow melt, heavy rainfall, skiing, excavation, loud noises
What is the driving force of landslides?
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- interbedded lava flows, pyroclastic flows, lahars
- usually intermediate or felsic
- frequently explosive, often viscous magma
- may erupt many times and stay active for 100,000 years
- usually relatively tall and somewhat wide
What are the characteristics of felsic lava?
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, - high gas content
- high viscosity
- explosive eruptions
- dangerous
What are 4 types of extrusive rock types and their composition?
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1. Basalt: dark colour, mafic, hot magma, low viscosity, non-explosive
2. Andesite: darkish colour, maficish, hotish, lower viscosity, not likely to
explode
3: Dacite: lightish colour, felsicish, cooler, higher viscosity, potential to
explode
4. Rhyolite: light colour, felsic, cold magma, high viscosity, explosive
What are lahars?
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Volcanic mud flow that consist of water and loose volcanic debris
What are felsic rocks?
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Rocks high in silica levels, light in colour, high viscosity
, How does one make a hazard map?
Give this one a try later!
1. map volcanic deposits
2. determine deposit type
3. determine age of deposits and eruption frequency
4. consider the risk
What are the characteristics of a Plinian eruption?
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- andesitic/rhyolitic ash
- violently explosive
- pyroclastic flows
- ash plume
- volcanic ash rain
What are some triggers of landslides?
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- earthquakes, snow melt, heavy rainfall, skiing, excavation, loud noises
What is the driving force of landslides?
Give this one a try later!
