Slide 1

Pacific Ring of Fire
Eric Angat
Teacher


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New Madrid fault
Convergent boundary subduction and volcanoes

Transform boundarySan Andreas fault

Charleston fault (SC)


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Convergent boundary subduction and volcanoes

Transform boundarySan Andreas fault


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Missouri
Kentucky
New Madrid fault

Tennessee

Arkansas


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The majority of the research shows that the plates move at the average rate of between
approximately 0.60 cm/yr to 10 cm/yr. Some sources state that in the North Atlantic, the
rate of movement is only about 1 cm (about 0.4 in) per year, while in the Pacific it amounts
to more than 4 cm (almost 2 in) annually, while others say that plates, in general, travel
from 5 to 10 cm/yr.


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Warm colours show regions with the
highest probability of strong shaking,
which tend to be located near, or
influenced by, major plate boundaries.
Earthquake clustering in midcontinental areas such as New Madrid
and Charleston is here interpreted to
reflect continuing deformation
sufficient to produce frequent large
earthquakes.


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1.What is pyroclastic flow?
2.How did the pyroclastic flow kill
the group of scientists and
press?
3.What is the Pacific Ring of Fire?
4. Where are the volcanoes in the
Pacific Ocean located?


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http://www.youtube.com/watch?v=Y7Z1cvXszac


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1. What is pyroclastic flow?

superheated volcanic dust and gases.
2. How did the pyroclastic flow kill the group of scientists
and press?

Their lungs were burned by the
pyroclastic gases.
3. What is the Pacific Ring of Fire?

Active volcanoes that circle the
Pacific Ocean.
4. Where are the volcanoes in the Pacific Ocean located?

The volcanoes occur along subduction
zones around the Pacific ocean.


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5. What is common along the
Pacific Ring of Fire?
6. What causes the frequent
earthquakes in the Pacific Ring
of Fire?
7. Which areas in the United
States are most prone to
earthquakes? Why?


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https://www.youtube.com/watch?v=jpqUu0PLkmM


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When Mount Vesuvius erupted cataclysmically in
the summer of A.D. 79, the nearby Roman town of
Pompeii was buried under several feet of ash and
rock. The ruined city remained frozen in time until
it was discovered by a surveying engineer in 1748.


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convergent

convergent

Transform or strike slip

Atlantic
Ocean

convergent
divergent

No plate
boundary

Pacific
Ocean

divergent


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convergent

convergent

Transform or strike slip

Atlantic
Ocean

convergent
divergent

No plate
boundary

Pacific
Ocean

divergent


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Hot Spots Volcanoes
Mantle plumes are areas of hot,
upwelling mantle. A hot spot develops
above the plume. Magma generated
by the hot spot rises through the rigid
plates of the lithosphere and produces
active volcanoes at the Earth's surface.
As oceanic volcanoes move away from
the hot spot, they cool and subside,
producing older islands, atolls, and
seamounts. As continental volcanoes
move away from the hot spot, they
cool, subside, and become extinct.

https://www.youtube.com/watch?v=AhSaE0omw9o


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5. What is common along the Pacific Ring of Fire?

Earthquake is most common in the
Pacific Ring of Fire.
6. What causes the frequent earthquakes in the
Pacific Ring of Fire?

The Pacific plate is constantly shifting
and subducting beneath the continental
plates.
7. Which areas in the United States are most
prone to earthquakes? Why?

Alaska and the Pacific North-West


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