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Krakatoa: 1883

Krakatoa: 1883. Tom Demmer, Megan Hurley, Sarah Noble. Volcanic Eruptions. Occur near destructive margins between tectonic plates Eruptions spew lava (called magma while inside) and ash Lava and ash may be deadly to those on slopes and in valleys surrounding the mountain. Volcanic mountain

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Krakatoa: 1883

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  1. Krakatoa: 1883 Tom Demmer, Megan Hurley, Sarah Noble

  2. Volcanic Eruptions • Occur near destructive margins between tectonic plates • Eruptions spew lava (called magma while inside) and ash • Lava and ash may be deadly to those on slopes and in valleys surrounding the mountain

  3. Volcanic mountain Indonesian island of Rakata Elevation: 2,667 feet Famous eruption occurred in 1883 Eruption began on June 19, 1883 Pre- and post-eruption events went on for months Eruption destroyed two-thirds of the island Eruption created the loudest sound ever observed by mankind Krakatoa

  4. During the Eruption • Occurred on the morning of May 20, 1883 in Indonesia when the ash started to rise • For 2 months there were small eruptions • August 26-27 was when the largest explosion in historical time occurred • Last day, northern 2/3 of the island collapsed

  5. During the Eruption • Largest explosion, heard as far as Perth in Australia • Six cubic miles of rock, ash, and pumice • It was so big that debris scattered as far as Madagascar • Ash caused the formation of other islands

  6. Location and why it happened • 130 active volcanoes on Indonesia • Arc system created by subduction • Active volcano in the Sundra straits • Krakatoa’s location makes it highly explosive

  7. Results of Krakatoa • Tsunamis: • Only 1/3 of Krakatoa remained above sea level after the eruption • Wave up to 40 feet tall • Responsible for about 90% of casualties • Deadly Debris: • Falling tephra and hot protoclastic flows • About 2,000 casualties sufferd severe burns

  8. Results of Krakatoa • Atmosphere: • Fine fragments of tephra pulled into stratosphere • Decrease in temperature and exotic sky colors • Anak: • “Child of Krakatoa”

  9. Results of Krakatoa • At least 36,417 casualties • 165 coastal villages destroyed

  10. References • http://www.geology.sdsu.edu/how_volcanoes_work/Krakatau.html • http://www.answers.com/topic/krakatoa • http://www.geology.sdsu.edu/how_volcanoes_work/Thumblinks/Krak_symons_page.html • http://volcano.und.nodak.edu/vwdocs/volc_images/southeast_asia/indonesia/krakatau_5b.gif • http://www.geology.sdsu.edu/how_volcanoes_work/subducvolc_page.html • http://en.wikipedia.org/wiki/Krakatoa

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