22-10-2010, 11:14
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חבר מתאריך: 14.01.09
הודעות: 8,466
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מה שמרשים בצונאמי זה לא המשרעת (הגובה) שלו, אלא אורך הגל שלו שמגיע לכמה מאות קולומטרים וגורם לו להיות כה הרסני:
ציטוט:
While everyday wind waves have a wavelength (from crest to crest) of about 100 metres (330 ft) and a height of roughly 2 metres (6.6 ft), a tsunami in the deep ocean has a wavelength of about 200 kilometres (120 mi). Such a wave travels at well over 800 kilometres per hour (500 mph), but due to the enormous wavelength the wave oscillation at any given point takes 20 or 30 minutes to complete a cycle and has an amplitude of only about 1 metre (3.3 ft).[15] This makes tsunamis difficult to detect over deep water. Ships rarely notice their passage.*
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http://en.wikipedia.org/wiki/Tsunami
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