Chapt03_ PlateTectonics

Chapt03_ PlateTectonics - Plate Tectonics Tools of the...

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Unformatted text preview: Plate Tectonics Tools of the Trade How do we learn about the nature of the ocean floor and structure of the oceanic crust? a. Ocean Floor Mapping using sound: multi- beam (SEA BEAM), side-scan (SEA MARK) B. Seismic studies: reflection and refraction of low frequency sound (earthquake) waves c. Magnetic Studies d. Dredging/Camera Tows e. Deep Submersibles f. Satellite geodesy: measuring gravity and sea-surface height g. Deep Sea Drilling Evidence for Plate Tectonics A. Evidence from the continents 1. Shape of the continental boundaries 2. Paleomagnetic pole positions 3. Matching geologic features 4. Large displacement on transcurrent faults 5. Most seismicity and volcanism restricted to narrow zones 6. Seismicity of Benioff zones (deep earthquakes only in such zones; near trenches) B. Evidence from the Oceans 1. Improved fit of the continents with continental margins rather coast lines 2. Mid-ocean ridges 3. Trenches and Island arcs 4. Magnetic anomaly patterns 5. Seismicity of transform faults 6. Island chains (hot spot traces) aligned parallel...
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This note was uploaded on 09/24/2011 for the course OCE 1001 taught by Professor Staff during the Spring '11 term at Broward College.

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Chapt03_ PlateTectonics - Plate Tectonics Tools of the...

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