global and regional tectonics - usgs earthquake hazards ... · transform boundaries average slip...
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![Page 1: Global and Regional Tectonics - USGS Earthquake Hazards ... · Transform boundaries Average slip rate of oceanic transform faults=40.5 mm/yr Average slip rate of continental transform](https://reader034.vdocuments.net/reader034/viewer/2022042218/5ec389fdd0f700422a0b717c/html5/thumbnails/1.jpg)
Global and Regional Tectonics
Kathy Haller
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Plate boundaries and earthquakes
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Plates of the world
http://pubs.usgs.gov/gip/dynamic/understanding.html
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Major classes of plate boundaries
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Divergent boundaries
Average spreadingrate 46.6 mm/yr
10 km3 of crustadded each yearworldwide
http://pubs.usgs.gov/gip/dynamic/understanding.html
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Mid-ocean ridge spreading center
http://animations.geol.ucsb.edu/animations/quicktime/SFS_Seafl&arrows.mov
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Transform boundaries
Average slip rate ofoceanic transformfaults=40.5 mm/yr
Average slip rate ofcontinental transformfaults=24.7 mm/yr
Little or no crust iscreated or consumed
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Ring of fire
http://pubs.usgs.gov/gip/dynamic/fire.html
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Convergent boundaries
http://animations.geol.ucsb.edu/download/jrscsubdtn.php
Average convergence rate=62.3 mm/yr
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Continent-continent collision
http://animations.geol.ucsb.edu/download/himalayancollision.php
Average convergence rate=26.2 mm/yr
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Indian-Eurasian plate collision
http://pubs.usgs.gov/gip/dynamic/understanding.html
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Himalayan deformation
http://pubs.usgs.gov/gip/dynamic/understanding.html
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Distribution of similar crust
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50 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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45 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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40 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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35 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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30 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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25 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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20 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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15 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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10 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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5 million years ago
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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Present
(Hall, 1996) http://www.gl.rhul.ac.uk/seasia/Publications/papers/papers.html
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Summary