tsunamis

The Tsunami portal

Earthquakes, volcanic eruptions and other underwater explosions (including detonations, landslides, glacier calvings, meteorite impacts and other disturbances) above or below water all have the potential to generate a tsunami. Unlike normal ocean waves, which are generated by wind, or tides, which are in turn generated by the gravitational pull of the Moon and the Sun, a tsunami is generated by the displacement of water from a large event.

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Tsunamis affecting New Zealand are mainly due to the country being part of the geologically active Pacific Plate and associated with the Pacific Ring of Fire. Tsunamis affect New Zealand's coastline reasonably frequently and tend to be caused by earthquakes on the Pacific Plate both locally and as far away as South America, Japan, and Alaska. Some have been attributed to undersea landslides, volcanoes, and at least one meteor strike. New Zealand is affected by at least one tsunami with the a wave height greater than one metre every ten years on average. The history of tsunamis is limited by the country's written history only dating from the early to mid-1800s with Māori oral traditions and paleotsunami research prior to that time. Studies are also being carried out into possible tsunamis on the larger inland lakes, particularly from landslides. (Full article...)

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Events that can cause a tsunami

In seismology, a tsunami earthquake is an earthquake which triggers a tsunami of significantly greater magnitude, as measured by shorter-period seismic waves. The term was introduced by Japanese seismologist Hiroo Kanamori in 1972. Such events are a result of relatively slow rupture velocities. They are particularly dangerous as a large tsunami may arrive at a coastline with little or no warning. (Full article...)

List of events articles
Earthquake Submarine earthquake Submarine eruption Landslide Glacier calving Meteorite impact

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General images

The following are images from various tsunami-related articles on Wiki English.

Image 1Figure 1: Diagram showing how earthquakes can generate a tsunami. (from Tsunamis in lakes)
Image 2Lisbon earthquake and tsunami in November 1755 (from Tsunami)
Image 3Diagram showing several measures to describe a tsunami size, including height, inundation and run-up (from Tsunami)
Image 4Calculated travel time map for the 1964 Alaska tsunami (in hours) (from Tsunami)
Image 5Evacuation route sign on the pavement in Kamakura, Japan (from Tsunami warning system)
Image 6Tsunami aftermath in Aceh, Indonesia, December 2004 (from Tsunami)
Image 7When the wave enters shallow water, it slows down and its amplitude (height) increases. (from Tsunami)
Image 8An illustration of the rhythmic "drawback" of surface water associated with a wave. It follows that a very large drawback may herald the arrival of a very large wave. (from Tsunami)
Image 9Evacuation route sign in a low-lying coastal area on the West Coast of the United States (from Tsunami warning system)
Image 10Plate slips, causing subsidence and releasing energy into water. (from Tsunami)
Image 11The 2004 Indian Ocean tsunami at Ao Nang, Krabi Province, Thailand (from Tsunami)
Image 12A seawall at Tsu, Mie Prefecture in Japan
Image 13Over-riding plate bulges under strain, causing tectonic uplift. (from Tsunami)
Image 14The energy released produces tsunami waves. (from Tsunami)
Image 15Mast with warning system, and sign detailing escape routes, on the coast of Okumatsushima, Miyagi prefecture, Japan (this coast was severely hit by the 2011 tsunami) (from Tsunami warning system)
Image 16Tsunami warning system in East Timor (from Tsunami warning system)
Image 17The wave further slows and amplifies as it hits land. Only the largest waves crest. (from Tsunami)
Image 18Tsunami Early Warning Tower board in Hikkaduwa, Sri Lanka (from Tsunami warning system)
Image 19One of the deep water buoys used in the DART tsunami warning system (from Tsunami)
Image 20Drawing of tectonic plate boundary before earthquake (from Tsunami)
Image 21Japanese Tsunami warning sign (from Tsunami warning system)
Image 22Satellite image of Lake Kivu (from Tsunamis in lakes)

Selected tsunami article

Pos	Team v t e	Pld	W	L	GF	GA	GD	Pts	Qualification
1	Kyrgyzstan	3	3	0	8	0	+8	9	Winner
2	Indonesia (H)	3	2	1	7	3	+4	6	Runner–up
3	Mongolia	2	0	2	2	6	−4	0	Third place
4	Brunei	2	0	2	0	8	−8	0

Source: ^{[citation needed]}
Rules for classification: Tiebreakers
(H) Hosts

(Full article...)

Selected tsunami articles

In the news

3 April 2024 – 2024 Hualien earthquake

A magnitude 7.4 earthquake strikes off the coast of Taiwan, prompting tsunami warnings for Okinawa Prefecture, Japan. A large section of the uninhabited Guishan Island collapses into the ocean. Nine people are killed in Taiwan, including four by rockfalls, with more than 930 others injured. (AP) (Al Jazeera)

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This article uses material from the Wikipedia English article Portal:Tsunamis, which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0"); additional terms may apply (view authors). Content is available under CC BY-SA 4.0 unless otherwise noted. Images, videos and audio are available under their respective licenses.
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