ISP 203B EXAM 2 Questions With Solutions
Strato-Volcanoes - Very steep, tall, conical mountains formed of strata (layers) of lava
flows and pyroclastic flows.
- Associated with dangerous ash clouds and pyroclastic flows.
- They may have lava domes at the summit.
Calderas - Very large voids f...
Strato-Volcanoes - Very steep, tall, conical mountains formed of strata (layers) of lava
flows and pyroclastic flows.
- Associated with dangerous ash clouds and pyroclastic flows.
- They may have lava domes at the summit.
Calderas - Very large voids formed by large explosions of magma that destroyed
previously existing volcanic shapes.
- Depressions that are often filled by lakes.
Typical Eruption Warning - Includes increasing seismicity (earthquakes)
- Increase in degassing
- Ground movements
- Changes in ground temp.
- Small short-lived eruptions may announce a larger one
Typical Eruption Warning probs... - Most of these events are not followed by a major
eruption
- Evacuations are costly and if no eruption follows scientist credibility is reduced.
, ISP 203B EXAM 2 Questions With Solutions
- However, lack of evacuation has been the origin of terrible volcanic disasters
Mt. Vesuvius - Strato volcano in S Italy
- Near populated Naples Italy
- Most famous for the Pompeii eruption in AD 79, which got buried in ash fallout and pyroclastic
flows
Large Volcanic Eruptions - Have the capability to affect the Earth's global climate, at least
for a few years.
- Very large ash clouds stall in the high atmosphere, where they block parts of the radiation that
Earth receives from the sun. Less radiation= Cooler temps.
- Volcanic gases can have similar affect
Mt. Pinatubo, Phillipines June 12-15 1991 - 2nd largest eruption of 20th century
- 5km of magma
- Had been dormant for 500 years
- Death toll was low (740), because of awareness and quality evac policies
Mt. Tambora, Indonesia 1815 - Largest eruption known in historical times
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