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Teletsunami
A teletsunami (also called an ocean-wide tsunami, distant tsunami, distant-source tsunami, far-field tsunami, or trans-ocean tsunami) is a tsunami that originates from a distant source, defined as more than away or three hours' travel from the area of interest, sometimes travelling across an ocean. All teletsunamis have been generated by major earthquakes such as the 1755 Lisbon earthquake, 1960 Valdivia earthquake, 1964 Alaska earthquake, and 2004 Indian Ocean earthquake.
==Overview==
Teletsunamis can be generated several different ways, the most common being earthquakes with magnitudes higher than 7.5. Vertical displacement from a thrust earthquake is more likely to produce a teletsunami than lateral displacement from strike-slip fault. Because of this, subduction zones, which occur when dense oceanic crust burrows underneath less-dense continental crust, are at greater risk of producing teletsunamis. The Pacific coast of North America is an example of a subduction zone: it includes the Cascadia subduction zone, which lies off the coasts of British Columbia, Washington, Oregon, and Northern California. The regions around the Aleutian Islands and Gulf of Alaska are also capable of producing large offshore earthquakes and thus large tsunamis.
Natural precursors that may indicate the approach of a teletsunami include a drawback, when the ocean water recedes well below low tide. While drawbacks may not always occur, their presence are considered a sign of impending danger.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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