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'''{{PAGENAME}}''' adalah [[tsunami]] yang mencapai ketinggian lebih dari 100 meter. Selain beberapa tsunami besar di [[Alaska]] yang mencapai tinggi 520 meter, megatsunami terakhir yang melanda wilayah berpenduduk diduga terjadi sekitar 4000 tahun yang lalu. Menurut para ahli geologi, megatsunami biasanya disebabkan oleh tanah [[longsor]] yang sangat besar, seperti runtuhnya sebuah [[pulau]], ke laut atau samudra,
'''{{PAGENAME}}''' dapat naik hingga
Di tengah lautan dalam, megatsunami hampir tidak dapat dirasakan. Permukaan laut hanya naik vertikal sekitar satu meter, dengan wilayah yang sangat luas, hingga ratusan kilometer.
Tsunami di [[Banda Aceh]] hampir dapat dikategorikan megatsunami karena jumlah korban jiwa yang sangat besar (200.000 orang) dan mencapai negara-negara tetangga seperti: [[Malaysia]], [[Thailand]], [[India]], [[Sri Lanka]] dan [[Bangladesh]].
[[Gempa bumi]] bawah laut umumnya tidak menghasilkan tsunami yang sedemikian besar, kecuali jika gempa ini juga menghasilkan longsor bawah laut. ▼
▲[[Gempa bumi]] bawah laut umumnya tidak menghasilkan tsunami yang sedemikian besar, kecuali jika gempa ini juga menghasilkan longsor bawah laut.
==Megatsunami dalam sejarah==▼
▲== Megatsunami dalam sejarah ==
==Potensi ancaman megatsunami==▼
* Megatsunami tahun 1792. Letusan gunung Aso di [[Jepang]] menyebabkan bagian gunungnya jatuh ke laut. Menyebabkan tsunami setinggi 100 meter.
* Megatsunami tahun 1958. Longsor besar menyebabkan tsunami setinggi 524 meter di teluk Lituya. Tsunami tertinggi dalam sejarah manusia.
* Megatsunami tahun 1963. Longsor diatas bendungan Vajont menyebabkan tsunami setinggi 250 meter dan membunuh sekitar 2.000.000 orang.
* Megatsunami tahun 1980. Letusan gunung St. Helens di [[Amerika Serikat]], menyebabkan longsor. Lalu membuat Tsunami setinggi 260 meter.
* 65 juta tahun yang lalu. Saat tumbukan meteorit yang membentuk [[kawah Chicxulub]], menyebabkan tsunami setinggi 6 kilometer. Cukup tinggi untuk menenggelamkan pulau seperti [[Madagascar]]. Tsunami tertinggi dalam sejarah, dan juga dijuluki "Ibu dari semua Tsunami".
* 35 juta tahun yang lalu. Tumbukan meteorit di teluk Chesepeake, mungkin menyebabkan megatsunami yang berulang- ulang.
Selain itu megatsunami tertinggi juga terjadi di sekitar [[British Columbia]], gunung Etna di [[Sisilia]], di laut [[Norwegia]], di kepulauan [[Réunion]] di sebelah timur Madagascar, dan di [[kepulauan Hawaii]].
▲== Potensi ancaman megatsunami ==
* Tenggelamnya suatu pulau yang terkena imbas tsunami
* Korban jiwa yang sangat besar
* Kerugian harta benda yang besar
* Punahnya kehidupan
== Bacaan lebih lanjut ==
* BBC 2 TV; 2000. Transcript "Mega-tsunami; Wave of Destruction", Horizon. First screened 21.30 hrs, Thursday, 12 October 2000.
* {{cite journal |doi=10.1016/0377-0273(94)90053-1 |author=Carracedo, J.C. |title=The Canary Islands: an example of structural control on the growth of large oceanic-island volcanoes |journal=J. Volcanol. Geotherm Res. |volume=60 |issue= 3–4|pages=225–241 |year=1994 |bibcode = 1994JVGR...60..225C |ref=harv }}
* {{cite book|author=Carracedo, J.C.|chapter=A simple model for the genesis of large gravitational landslide hazards in the Canary Islands|editor=McGuire, W; Jones; Neuberg, J.P.|title=Volcano Instability on the Earth and Other Planets|publisher=Geological Society|location=London|year=1996|isbn=|pages=125–135|volume=110|series=Special Publication}}
* {{cite journal |author=Carracedo, J.C. |title=Growth, Structure, Instability and Collapse of Canarian Volcanoes and Comparisons with Hawaiian Volcanoes |journal=J. Volcanol. Geotherm. Res. |volume=94 |issue= |pages=1–19 |year=1999 |doi= 10.1016/S0377-0273(99)00095-5|url= |bibcode=1999JVGR...94....1C |ref=harv}}
* {{cite journal |doi=10.1016/S0377-0273(99)00101-8 |last1=Day |first1=S.J. |last2=Carracedo |first2=J.C. |last3=Guillou |first3=H. |last4=Gravestock |first4=P. |title=Recent structural evolution of the Cumbre Vieja volcano, La Palma, Canary Islands: volcanic rift zone re-configuration as a precursor to flank instability |journal=J. Volcanol. Geotherm. Res. |volume=94 |issue= |pages=135–167 |year=1999 |ref=harv|bibcode = 1999JVGR...94..135D |url=http://www.geo.arizona.edu/~andyf/LaPalma/Rift%20Zone.pdf}}
* {{cite journal |author=Moore, J.G. |title=Giant Submarine Landslides on the Hawaiian Ridge |publisher=US Geologic Survey |id=Professional Paper 501-D |pages=D95–8 |year=1964 |ref=harv }}
* {{cite journal |last=Pararas-Carayannis |first=G. |title=Evaluation of the Threat of Mega Tsumami Generation from Postulated Massive Slope Failure of Island Stratovolcanoes on La Palma, Canary Islands, and on The Island of Hawaii, George |journal=Science of Tsunami Hazards |volume=20 |issue=5 |pages=251–277 |year=2002 |ref=harv}}
* {{cite journal |author=Pinter, N.; Ishman, S.E. |title=Impacts, mega-tsunami, and other extraordinary claims |journal=GSA Today |volume=18 |issue=1 |pages=37–38 |year=2008 |doi= 10.1130/GSAT01801GW.1|url=http://www.gsajournals.org/archive/1052-5173/18/1/pdf/i1052-5173-18-1-37.pdf |format=PDF |ref=harv}}
* Rihm, R; Krastel, S. & CD109 Shipboard Scientific Party; 1998. Volcanoes and landslides in the Canaries. National Environment Research Council News. Summer, 16–17.
* {{cite journal |author=Siebert, L. |title=Large volcanic debris avalanches: characteristics of source areas, deposits and associated eruptions |journal=J. Volcanol. Geotherm Res. |volume=22 |issue= 3–4|pages=163–197 |year=1984 |doi= 10.1016/0377-0273(84)90002-7|url= |bibcode=1984JVGR...22..163S |ref=harv}}
* {{cite journal |author=Vallely, G.A. |title=Volcanic edifice instability and tsunami generation: Montaña Teide, Tenerife, Canary Islands (Spain) |journal=Journal of the Open University Geological Society |volume=26 |issue=1 |pages=53–64 |year=2005 |ref=harv }}
* {{cite journal |last1=Voight |first1=B. |last2=Janda |first2=R. |last3=Glicken |first3=H. |last4=Douglas |first4=P.M. |title=Nature and mechanics of the Mount St Helens rockslide-avalanche of 18 May 190 |journal=Géotechnique |volume=33 |issue=10 |pages=243–273 |year=1983 |doi=10.1680/geot.1983.33.3.243 |ref=harv}}
* {{cite journal |last1=Ward |first1=S.N. |last2=Day |first2=S. |title=Cumbre Vieja Volcano — Potential collapse and tsunami at La Palma, Canary Islands |journal=Geophysical Research Letters |volume=28 |issue=17 |pages=3397–3400 |year=2001 |format=PDF |doi=10.1029/2001GL013110 |url=http://www.es.ucsc.edu/~ward/papers/La_Palma_grl.pdf |bibcode=2001GeoRL..28.3397W |ref=harv}}
* Sandom, J.G., 2010, [http://www.amazon.com/dp/1452839239/ ''The Wave — A John Decker Thriller''], Cornucopia Press, 2010. A thriller in which a megatsunami is intentionally created when a terrorist detonates a nuclear bomb on La Palma in the Canary Islands.
* Bonelli Rubio, J.M., 1950. Contribucion al estudio de la erupcion del Nambroque o San Juan. Madrid: Inst. Geografico y Catastral, 25 pp.
* Ortiz, J.R., Bonelli Rubio, J.M., 1951. La erupción del Nambroque (junio-agosto de 1949). Madrid: Talleres del Instituto Geográfico y Catastral, 100 p., 1h. pleg.;23 cm
== Pranala luar ==
* [http://www.sms-tsunami-warning.com/pages/mega-tsunami-wave-of-destruction Mega Tsunami: history, causes, effects]
* [http://t14web.lanl.gov/Research/TDAC2000/mader.tsunami.00.pdf Mader, Charles L. Mega-Tsunamis] {{Webarchive|url=https://web.archive.org/web/20120208024212/http://t14web.lanl.gov/Research/TDAC2000/mader.tsunami.00.pdf |date=2012-02-08 }} Description of the Lituya Bay event.
* [http://geology.com/records/biggest-tsunami.shtml World's Biggest Tsunami: The largest recorded tsunami with a wave 1720 feet tall in Lituya Bay, Alaska].
* [http://www.benfieldhrc.org/in_the_news/press_cuttings/Insurance%20Day/why_the_only_certainty.htm Benfield Hazard Research Centre] {{Webarchive|url=https://web.archive.org/web/20080725045005/http://www.benfieldhrc.org/in_the_news/press_cuttings/Insurance%20Day/why_the_only_certainty.htm |date=2008-07-25 }}
* [http://www.sthjournal.org/media.htm Science of Tsunami Hazards] {{Webarchive|url=https://web.archive.org/web/20080517022018/http://www.sthjournal.org/media.htm |date=2008-05-17 }} A more skeptical view from The Tsunami Society.
* [http://www.bbc.co.uk/science/horizon/2000/mega_tsunami.shtml BBC — Mega-tsunami: Wave of Destruction] BBC Two program broadcast 12 October 2000
* [http://newsvote.bbc.co.uk/mpapps/pagetools/print/news.bbc.co.uk/2/hi/science/nature/3963563.stm La Palma threat "over-hyped"] {{Webarchive|url=https://web.archive.org/web/20170324192613/http://newsvote.bbc.co.uk/mpapps/pagetools/print/news.bbc.co.uk/2/hi/science/nature/3963563.stm |date=2017-03-24 }}, [[BBC News]], 29 October 2004
* [http://www.lapalma-tsunami.com/ Mega-hyped Tsunami story] {{Webarchive|url=https://web.archive.org/web/20110201152423/http://lapalma-tsunami.com/ |date=2011-02-01 }} A detailed of analysis demolishing the La Palma Tsunami speculation.
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