Lecture19_ocean floor

Lecture19_ocean floor - Ocean ridge system The Mid-Atlantic...

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Ocean ridge system
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The Mid-Atlantic Ridge is a high elevation on the ocean floor as seen in this drawing of the ridge south of Iceland.
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One of the most destructive volcanic eruptions in the history of Iceland began in the early morning of January 23, 1973, near the Nation‘s premier fishing port, the town of Vestmannaeyjar (Vést- mun- ayar), on Heimaey (Háme-a- ay), the only inhabited isle in the Vestmannaeyjar volcanic archipelago.
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Heimaey Volcano erupting on a small island off the south coast of Iceland.
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Shoveling black volcanic ash to prevent roof collapse.
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Heimaey Volcano erupting at night.
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Basalt lava from Heimaey Volcano, invading the village.
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Pumping sea water onto the advancing front of the basalt flow, to freeze the lava and prevent further advance.
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The Mid-Atlantic Ridge continues southward, maintaining a precise midway position between the Old World and New World. Fracture zones cut the ridge, offsetting segments of the ridge relatively to the left or to the right.
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sharply through a bend, individual segments are offset along fracture zones. Brazil
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This note was uploaded on 07/07/2010 for the course GEO geo taught by Professor Long during the Spring '10 term at University of Texas.

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Lecture19_ocean floor - Ocean ridge system The Mid-Atlantic...

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