Tectonic Boundaries
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Transcript of Tectonic Boundaries
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Tectonic Plate Boundaries
By Drew Lindow
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Divergent Boundaries
• A divergent boundary is created when two plates move apart from one another.
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Mid-Atlantic Ridge• The Mid-Atlantic ridge is the most famous
divergent plate boundary. The ridge is spreading at a rate of 3.5 cm/year.
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South West Indian Ocean Ridge• The S. W. Indian Ocean Ridge separates the
Somalia and African plates from the Antarctic plate. It spreads at a rate of 1.5 cm/year.
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Convergent Boundaries
• A convergent boundary is created when two plates push towards each other.
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Himalayas • Continental - Continental• The Himalayas were formed by the converging of
the Eurasian plate and the Indian plate.
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The Chile Fault
• This is a double fault. On the west is an oceanic – continental boundary and east of that is a continental – continental boundary.
• This is a convergence of the Nazca and S. American plate.
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Aleutian Trench• Oceanic - Continental
• The Aleutian Trench and the Aleutian Islands were formed by the collision between the northern part of the Pacific plate and the North American plate.
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Java Trench• Oceanic – Continental
• The Java trench is a convergence of the India plate on the southwest and the Burma and Sunda plates on the northeast.
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Philippine Plate• Oceanic – Oceanic• The Philippine plate converges with the Pacific
plate to form the Marianas Trench.
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Caribbean Fault• Oceanic – Oceanic• The American plates are converging with the
Caribbean plate from the east.
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Transform Boundaries
• A transform boundary is created when two plates slide past each other. Earthquakes are commonly made when the two plates build up stress and suddenly release it.
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Alpine Fault• The Alpine Fault creates a transform boundary
between the Pacific plate and the Indo-Australian plate. The average slip rate is 3 cm/year.
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Alpine Fault
• This image shows the Alpine Fault line crossing the souther alps in New Zealand.
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Divergent Offsetting• Many transform faults are found on the ocean floor where
they offset diverging plates in a zig-zag like motion. Below is the Mid-Atlantic Ridge and some offsetting transform faults.
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Sources
• http://www.geography-site.co.uk• http://www.scarborough.k12.me.us• http://en.wikipedia.org• Google Earth