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Volcano Types

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by

Nicole Seibert

on 22 August 2014

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Transcript of Volcano Types

http://wwnorton.com/college/geo/earth4/animations.aspx
Stratovolcano
Cinder cone
Shield volcano
Caldera
Dome
Types of Volcanoes
http://www.subduction.net/Storage%20for%20Animations/VolcanoTypes.html
Shape:
Conical
Eruption style:
Explosive
Gases:
Trapped
Products:
ash, lava, tephra,
pumice
Magma type:
FELSIC
Viscosity:
med to high
Examples:
Mt. St. Helens, USA
Pinatubo, Phillippines
Vesuvius, Italy
Mt Unzen, Japan
Assoc. rocks:
Rhyolite, Andesite,
pumice, ash, tuff
Plate Boundary type: :
Subduction zone
Shape:
steep and conical
Eruption style:
Explosive and effusive
Gases:
some trapped
Products:
scoria fragments, lava
Magma type:
MAFIC
Viscosity:
low
Examples:
Paricutin, Mexico
Sunset Crater, AZ
Sp Crater, AZ
Wizard Island, Crater Lake, OR
Associated rocks:
basalt, scoria
Plate Boundary type:
Varies
Shape:
Broad

shield shaped
Eruption style:
Effusive
Gases:
Escaped
Products:
pahoehoe and a'a lava flows
Magma type:
MAFIC
Viscosity:
low
Examples:
Mauna Loa, USA
Kilueaua, Hawaii
Galapagos
Iceland
Assoc. rocks:
basalt
Plate boundary type:
spreading rifts,
HOT SPOT
Shape:
cauldron shaped
Eruption style:
Explosive
Gases:
Trapped
Products:
ash, lava, tephra,
pumice
Magma type:
FELSIC
Viscosity:
high
Examples:
Yellowstone, WY
Toba
Santorini, Italy
Assoc. rocks:
Rhyolite, Andesite,
pumice, ash, tuff
Plate Boundary type:
Subduction zone,
continental hot spot
Shape:
steep dome
Eruption style:
Explosive
Gases:
Trapped
Products:
ash, lava, tephra,
pumice
Magma type:
FELSIC
Viscosity:
high
Examples:
Mt Elden, AZ
Mt St Helens dome, WA
Mono Crater, CA
Assoc. rocks:
Rhyolite, Andesite,
pumice, ash, tuff
Plate Boundary type:
varies
Types of Mafic Lava Flows
Pahoehoe - runny looks like leather,
fingers.
A'a - sharp fragments moving together as one unit
Types of Eruptions
Explosive - trapped gases
Effusive -escaped gases
How Many Volcanoes Are There?
Millions of volcanoes have been active during the whole lifespan of the earth.
During the past 10,000 years, there are about 1500 volcanoes on land that are known to have have been active, while the even larger number of underwater volcanoes is unknown.
At present, there are about 600 volcanoes that have had known eruptions during recorded history,
while about 50-70 volcanoes are active (erupting) each year.
At any given time, there is an average of about 20 volcanoes that are erupting.
How often do they erupt?
Where do volcanoes occur?
What kind is the most dangerous?
Which volcanoes are the largest?
D Dome
Putting it all together
Volcanoes in the USA
http://healthyhug.com/12-explosive-volcanoes-that-are-ready-to-blast.html
The west
Hawaii
Alaska
Yellowstone
Mt St Helens, WA
AZ and NM
Products from effusive eruptions
Results of explosive eruptions
Lava flows
Scoria
Volcanic bombs
Volcanic Ash
Lahars (Mudflows)
Pyroclastic Flows
Volcano Hazards
Viscosity
Gas content
Effusive
Explosive
Mafic
Felsic
Mafic
Felsic
Magma is like a lava lamp. it rises through the lithosphere because it has a lower density than the surrounding rock.
Depends on............
Associated Rocks
Full transcript