Ch05 6slides pp

Ch05 6slides pp - Indian Ocean Tsunami, 26 December 2004...

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1 Tsunami Earthquakes and Natural Disasters Geol 171 Indian Ocean Tsunami, 26 December 2004 ± Tsunami swept through Indian Ocean, hitting Asian and African shorelines ± Estimated 245,000 deaths (probably higher) ± Seafloor west of Sumatra ruptured northward for 1,200 km over 7 minutes ± Caused by second largest earthquake (magnitude 9.2) of last 100 years , on subduction zone of Indian-Australian plate under Asian plate ± Movements on fault of up to 20 m Indian Ocean Tsunami, 26 December 2004 Indian Ocean Tsunami, 26 December 2004 The Tsunami swamps Phuket's Chedi resort (AFP/Joanne Davis) ht p:/ www.surfersvil age.com/article.asp?id_article=64 June 23, 2004 December 28, 2004 ht p:/ www.digitalglobe.com/images/tsunami 2004 Sumatra Earthquake & Tsunami ± Banda Aceh, Sumatra June 23, 2004 December 28, 2004 ht p:/ www.digitalglobe.com/images/tsunami 2004 Sumatra Earthquake & Tsunami ± Banda Aceh, Sumatra
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2 Tsunami Tsunami ± Japanese word: tsu = harbor, nami = waves ± Tsunami reach greater height when they enter harbor or other narrow space ± 8 m wave on open coastline Æ 30 m wave in narrow harbor ± Japan, 1896 ± Offshore earthquake shifted seafloor, causing tsunami to hit coastline 20 minutes later ± Highest waves (29 m) in narrow inlets ± 27,000 killed ± Tidal wave’ inappropriate as not related to tides Tsunami Tsunami ± Created most often by earthquakes ± Vertical shift of ocean floor that offsets water mass, transmitted throughout ocean in tsunami ± Usually vertical fault motions at subduction zones , mostly in Pacific Ocean
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This note was uploaded on 04/10/2008 for the course GEOL 171 taught by Professor Tsoflias during the Spring '08 term at Kansas.

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Ch05 6slides pp - Indian Ocean Tsunami, 26 December 2004...

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