Geography revision: Intra/Inter plate boundaries.

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  • Created on: 20-01-13 15:27
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Intra-Plate volcanism:
Hawaii:
Hawaiian Volcanic observatory.
Hotspot.
Mauna Loa is among Earth's most active volcanoes, having erupted 33 times
since its first well-documented historical eruption in 1843. Its most recent
eruption was in 1984.
Mauna Loa is the largest volcano on our planet.
A'a lava is the most common lava type. Basaltic lava characterized by a rough or rubbly
surface "Erik Klemmetti"
Intra-Plate seismicity:
England:
www.guardian.co.uk:
A 2.9magnitude earthquake struck the east Midlands, the British Geological Survey
(BGS) said on Friday morning. The tremor was reported across Derbyshire,
Leicestershire and Nottinghamshire.
The epicentre of the seismic activity was near Loughborough, Leicestershire, where
residents would have felt a bang and a slight vibration.
million times weaker than the 8.9 earthquake that struck off the Japanese coast and
caused a devastating tsunami in March 2011.
Causes could be due to anthropogenic factors such as fracking (shale gas extraction). It
was "most likely" that the seismic events were caused by the direct injection of fluid into
the fault zone. ­
(Fracking: Untangling fact
from fiction)

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Inter-Plate seismicity:
Destructive Seismicity:
Sendai (Pacific Ring of Fire) 11th March 2011
Magnitude: 8.9
Duration: 3-5 minutes
Frequency: 1000 weak tremors a year. Strongest for 300 years
Areal Extent: 516km². Tremors as far as Tokyo, Tsunami waves moderately felt
as far as West coast of America.
Epicentre: 129km from Sendai ­ Japanese trench
Depth: 32 km
Cause:
o Result of thrust faulting along or near the destructive plate boundary where
the Pacific Plate (Oceanic) subducts beneath the Eurasian plate
(continental).…read more

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Inter-Plate Volcanism:
Destructive volcanism
Montserrat: 1995-1997 Soufriere Hills - Began 18th July
Magnitude: VEI 3 vulcanian (<20km)
Duration: 2 years
Extrusion Rate: 10 cubic meters / sec
Cause: Phreatic eruption, which are caused by volcanically heated rock coming
into contact with water, from a Strato volcano. The Oceanic North American plate
is forced beneath the less dense continental Caribbean plate at a rate of 2.2
cm/yr.…read more

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