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Alaska

Alaska. Physical Processes that Occurs in our North-most State. http://www.statereports.us/2010/05/alaska-state-flag/.

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Alaska

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  1. Alaska Physical Processes that Occurs in our North-most State http://www.statereports.us/2010/05/alaska-state-flag/

  2. The image above the arrangement of volcanoes located in and around Alaska. Note that the majority of these volcanoes reside along the convergent plate boundary. The small red dots indicate 51 active volcanoes in the area. There are approximately 90 other younger volcanoes not shown in this photo. http://www.avo.alaska.edu/images/dbimages/1204683932_.jpg

  3. Earthquakes Happening Now As you can see, earthquakes occur around the clock! The epicenters are consistent with the arrangement of volcanoes shown on the previous slide. http://earthquake.usgs.gov/earthquakes/recenteqsus/Maps/special/Alaska.php

  4. Reported Alaskan Eruptions Through Time Within the last few decades, there is a major increase in eruptions throughout Alaska. http://www.avo.alaska.edu/images/dbimages/1248210793_.jpg

  5. Why These Earthquakes are so Frequent: Left: The Pacific Plate (yellow) moves under the American Plate (red) because it is less dense. This added pressure builds as the Pacific Plate melts, rising to the surface as magma, and eventually erupting to the surface as a volcano. The American Plate continues to move as well, causing chains of volcanic activity. The image to the right shows this in greater detail. http://www.pbs.org/harriman/images/log/lectures/crossenvol/subduction_lg.jpg http://geothermal.marin.org/GEOpresentation/sld007.htm

  6. Tsunamis If an earthquake occurs offshore, a tsunami can develop. The world’s biggest tsunami occurred in Alaska on July 9th, 1958, with waves measuring 1720 feet tall. Its destruction was rampant especially in Lituya Bay. Here is the magnitude of that destruction. http://geology.com/records/biggest-tsunami.shtml

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