Tom Demmer, Megan Hurley, Sarah Noble 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

Krakatoa 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

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

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

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

Results of Krakatoa Tsunamis: Deadly Debris: 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

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

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

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