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Topic: Megatsunami


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In the News (Wed 11 Nov 09)

  
  Armageddon Online - Mega Tsunami & Megatsunamis - Massive Tidal waves of Destruction
Megatsunamis are caused by impact, explosive volcanic, or landslide phenomena.
However as with Lituya bay, this is often localized; the most recent megatsunami known to have a widespread impact which reshaped an entire coastline occurred approximately 4,000 years ago on Réunion island, to the east of Madagascar.
Were this to happen it could in theory generate a megatsunami, causing local wave heights of hundreds of meters and a likely height of around 10–25 meters at the Caribbean and the Eastern American seaboard coast several hours later.
www.armageddononline.net /mega_tsunami.php   (879 words)

  
 Megatsunami - Wikipedia, the free encyclopedia
Megatsunami (often hyphenated as mega-tsunami, also known as iminami or "wave of purification") is an informal term used mostly by popular media and popular scientific societies to describe a very large tsunami wave beyond the size reached by typical tsunamis (around 10 metres).
Megatsunamis are caused by a very large impact or landslide into a body of water when the water cannot disperse in all directions.
Megatsunamis may be caused by landslide and rockfall phenomena, explosive volcanic events, or meteor impacts.
en.wikipedia.org /wiki/Megatsunami   (1686 words)

  
 Megatsunami
Megatsunami is a term used by the popular media to describe very large tsunamis.
Megatsunamis are caused by impact, explosive volcanic, or landslide phenomena.
The astounding heights quoted for megatsunami waves are due to the displacement of a very large volume of water movement in a very short time near a shoreline.
www.apocalypse-soon.com /megatsunami.htm   (601 words)

  
 Megatsunami
A megatsunami is a larger form of tsunami that is caused by a truly gigantic landslide, such as a collapsing island, into a huge body of water, such as an ocean or sea.
If the Cumbre Vieja[?] on La Palma were to collapse, the result would be a massive wave headed straight for the eastern coast of the United States, and the aftermath would hold obvious implications for the stability of the government and economy of the world.
While potentially not as devastating as a supervolcano, a megatsunami would be a very tragic disaster in whatever region of the world it occurred.
www.ebroadcast.com.au /lookup/encyclopedia/me/Megatsunami.html   (281 words)

  
 Wikinfo | Megatsunami   (Site not responding. Last check: 2007-10-19)
Megatsunami can rise to heights of hundreds of meters, travel at 890 km/h in mid-ocean and potentially reach 20 km inland in low-lying regions.
Megatsunami were first hypothesized by geologists searching for oil in Alaska.
Megatsunamis are a favorite subject of many films, given their undoubted visual impact; these megatsunamis are often caused by bolide impacts or other extraterrestrial causes, rather than by landslides.
www.wikinfo.org /wiki.php?title=Megatsunami   (966 words)

  
 ScienceDaily: Megatsunami   (Site not responding. Last check: 2007-10-19)
Megatsunami (often hyphenated as mega-tsunami, also known as iminami or "wave of purification") is an informal term used by popular media and popular science to describe a very large tsunami-like wave significantly beyond the size reached by tsunamis (typically around 10 meters).
Post-Tsunami Thailand Yields Lessons For Coastal Construction (April 3, 2005) -- An inspection of Thai villages and ports struck by tsunami waves has uncovered some engineering lessons that might reduce casualties and destruction in future oceanic upheavals, a Johns Hopkins...
Megatsunami -- Megatsunami (often hyphenated as mega-tsunami, also known as iminami or "wave of purification") is an informal term used by popular media and popular science to describe a very large tsunami-like...
www.sciencedaily.com /encyclopedia/Megatsunami   (1451 words)

  
 Important.ca. Tsunami, Megatsunami and Seich Information
A quick and dirty way to determine the distance from a location to the orgin of a seismic wave is to take the difference of arrival time from the P wave to the S wave in seconds and multiply by 8 kilometers per second.
Megatsunamis can rise to heights of hundreds of meters, travel at 890 km/h in mid-ocean and potentially reach 20 km inland in low-lying regions.
Some have conjectured that historic megatsunamis underlie the deluge legends that are common to many cultures throughout the world.
www.important.ca /tsunami_megatsunami_seiche.html   (1500 words)

  
 Megatsunami, the Inconceivable - tribe.net
Megatsunami the concept of how an event of this nature could occur was inconceivable and little understood at the time of its discovery.
The topology of the inlet is particular suited to producing local megatsunami in a nearby magnitude 7.5 earthquake on July 8 generated a landslidewithin the narrow inlet which produced a wave that washed out trees two hundredmeters above normal sea level.
Evidence of the geological Megatsunami appears to indicate there is an important connection between them and “Global Warming.” The scientific finds looks as though when sea levels rise do to climactic changes as a result of melting glaciers and polar ice caps the chances of potential for a megatsunami goes up exponentially.
people.tribe.net /redhand9/blog/ba54b534-193b-4fc6-b617-b11e439590ba   (2498 words)

  
 Talk:Megatsunami - Wikipedia, the free encyclopedia
Anyone reading the megatsunami or La Palma pages NEEDS to be aware of this potential threat that they pose and with all the publicity caused by the very sad 2004 tsunami in Asia it's an important opportunity to get the message out to people, who hopfully will ask their government representatives about it.
Megatsunami Terroist Threat It is possible that terroists could trigger a megatsunami event, at locatations such as La Palma, and cause wide spread global destruction.
Megatsunamis is defined as being 'bigger' then the average tsunami but there is no limit to the size of a tsunami, it simply depends on the size and power of what cause the tsunami.
en.wikipedia.org /wiki/Talk:Megatsunami   (3724 words)

  
 Hypothetical Disaster Encyclopedia Article @ Befall.net   (Site not responding. Last check: 2007-10-19)
Very large Tropical Cyclone can be triggered by meteorite impacts or landslides into a sea.
Geological evidence shows megatsunamis have happened in the past.
The numbering of the next World War is, however, disputed because some people believe that the Megatsunami was World War III and the World War III is World War IV.
www.befall.net /encyclopedia/Hypothetical_disaster   (962 words)

  
 Megatsunamis - Even more spectacular than regular ones
They are a local effect, either occurring on shores extremely close to the origin of a tsunami, or in deep, narrow inlets.
I think my parents have this huge fear of something like a megatsunami happening, so our house has always been either very much inland and landlocked or on top of some kind of mountain/hill thing.
Though there's no real worry of anything like that happening, as our city is on the bank of a very deep river which narrows as it goes, so the damage and impact would be kept to a fairly thin line down in the waterfront.
www.astahost.com /info.php/megatsunamis_t5699.html   (1534 words)

  
 Honolulu Star-Bulletin Hawaii News
While it is not likely to happen any time soon, Fryer said it is important to study these giant landslides and megatsunamis because of the potential for destruction.
If a similar event were to occur today on the Big Island, a megatsunami would flow over the isthmus of Maui, wipe out Honolulu and could reach Wahiawa, Fryer said.
The theory of megatsunamis is controversial among geologists, Fryer said.
starbulletin.com /2004/09/02/news/story4.html   (509 words)

  
 An alternate-history worldbuilding exercise for you... - RPGnet Forums
I mean, sure, a megatsunami will probably be on the cards, but I strongly doubt that it'll start off as a 650m high wall of water that stretches right across the Atlantic like that website describes - it only gets high when it goes over shallow water.
But one thing it's got going for it is that it at least recognizes the crackpot stuff (such as Planet X and the axis-shift scenario) for what it is, and that it points to events in geological and other history to back up most of their scenarios.
A megatsunami striking without warning (since I doubt very seriously that volcanology was very advanced back then) would all but obliterate both.
forum.rpg.net /showthread.php?t=35847   (2479 words)

  
 GEO 308
For impact supporters the spherule layer that marks the lowest Unit I is the result of airborne ejecta settling through the water column within a matter of hours after the impact.
The overlying massive sandstone of Unit II is deposited by the megatsunami, and the alternating sand, shale and rippled sandy limestone layers of Unit III are deposited by the back and forth of the seiche and the slow settling through the water column of the finer sediments.
An iridium anomaly at the top of Unit III and thin clay layer is taken to mark the final fallout of dust particles, and the K/T boundary.
geoweb.princeton.edu /students/courses/210/syl210.html   (1862 words)

  
 The Megatsunami of December 26 2004
The Megatsunami of December 26 2004 (Print This)
But these events were dwarfed by the December 26, 2004, megatsunami, with a final death toll that may exceed 230,000.
By some accounts, the death toll is higher than for all other tsunamis in the past 300 years combined.
www.nae.edu /NAE/bridgecom.nsf/weblinks/MKEZ-6DJJ4E?OpenDocument   (4829 words)

  
 IMPACT CRATERS AS SOURCES OF MEGATSUNAMI GENERATED CHEVRON DUNES
Chevron dunes are not oriented in the direction of the prevailing wind, they can form where there are no beaches, and they contain grains larger than 2 mm in diameter.
Chevrons are produced by megatsunamis originating from point sources, i.e.
In the Mediterranean, a megatsunami source near the Rhone delta is of undetermined origin.
gsa.confex.com /gsa/2006AM/finalprogram/abstract_114274.htm   (407 words)

  
 Indo American Chamber of Commerce USA
However if the landslide or cosmic body is large enough, it will create a megatsunami.
A megatsunami is a tsunami, usually caused by a collapsing island, asteroid impact, or huge chunks of ice falling into a large body of water, and is hundreds of meters high.
They also need not be symmetrical; tsunami waves may be much stronger in one direction than another, depending on the nature of the source and the surrounding geography.
www.iaccusa.org /tsunamirelief/whatistsunami.htm   (2215 words)

  
 Unexplained Mysteries :: The Megatsunami: Possible modern threat
Volcanic landslides that generate huge and devastating tsunamis tend to occur during historically warmer times on Earth, a new study suggests.
Scientists don't know exactly why, but since the global climate is warming as you read this, the apparent connection was tossed out this week as a reason for scientists to be concerned about the threat now.Tsunamis are waves that race across the ocean without much fanfare but grow to frightening proportions when they reach land.
Yet while quake-generated tsunamis have been observed from their genesis to the disastrous end, scientists have never witnessed a significant open-ocean tsunami generated by a landslide.Evidence exists at various locations around the world for megatsunamis, as scientists call the largest of these events.
www.unexplained-mysteries.com /viewnews.php?id=29262   (307 words)

  
 What a Tsunami Is   (Site not responding. Last check: 2007-10-19)
Tsunamis can be regional, like the recent tsunami in SE Asia, or localized, like the megatsunami in Lituya Bay, Alaska in 1958.
Regional scale tsunamis are general caused by crustal rebound after a large earthquake, usually associated with a subduction zone
Localized tsunamis are also generally associated with earthquakes, but the physical cause of the wave is usually due to a landslide or pyroclastic flow.
ffden-2.phys.uaf.edu /212_spring2005.web.dir/michael_tapp/what.htm   (274 words)

  
 LiveScience.com - The Megatsunami: Possible Modern Threat
Yet while quake-generated tsunamis have been observed from their genesis to the disastrous end, scientists have never witnessed a significant open-ocean tsunami generated by a landslide.
Evidence exists at various locations around the world for megatsunamis, as scientists call the largest of these events.
He's even attached some odds to the threat: "The probability of a megatsunami in Hawaii in the next 10,000 years is about 50 percent."
www.livescience.com /forcesofnature/041214_tsunami_mega.html   (832 words)

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