SK A340 From Sweden, joined Mar 2000, 845 posts, RR: 2 Posted (9 years 8 months 4 weeks 20 hours ago) and read 3330 times:
Unfortunately not only Asia is affected by the horrible tsunami. Reports from Africa, mainly Somalia, tells us about casualties there too, which means that the wave moved over the entire Indian Ocean and even had enough energy to destroy areas in Africa. Does anyone know anything about the ship traffic in the Indian Ocean? When I look at the map at http://www.redcross.org It looks like the tsunami has passed the entrance/exit to the Red Sea, which means the entrance/exit to the Suez channel. How many ships can we expect being reported as missing or be lost due to this disaster and what is the average number of crew members in a trans-ocean ship? And what about the cargo in those ships? Also, is this a popular area for cruisers? If so, I'm afraid we can add a lot more to the execrable statistics.
Boeing4ever From , joined Dec 1969, posts, RR:
Reply 2, posted (9 years 8 months 4 weeks 20 hours ago) and read 3307 times:
A Tsunami is undetectable on the Ocean surface as it travels the open ocean...it is only when the energy begins to hit land and shallow waters that the water is forced up into a tidal wave which crashes ashore. Unless the ships were close to land, most in the open sea probably didn't even notice it.
B757300 From United States of America, joined Dec 2000, 4114 posts, RR: 22
Reply 4, posted (9 years 8 months 4 weeks 20 hours ago) and read 3289 times:
Ships in the open ocean most likely didn't even notice the tsunami. When a tsunami is traveling through deep water, they range from from a few inches to a few feet high. It will pass as nothing more than a large swell if noticeable at all. Only when they get close to shore, and the sea floor rises, does the tsunami's height grow.
The successive waves of a tsunami in the deep sea have such great length and so little height they are not visually recognizable from a surface vessel or from an airplane. The passing waves produce only a gentle rise and fall of the sea surface. During the April 1946 tsunami at Hawai`i, ships standing off the coasts observed tremendous waves breaking on shore but did not detect any change in sea level at their offshore locations.
ConcordeBoy From , joined Dec 1969, posts, RR:
Reply 5, posted (9 years 8 months 4 weeks 20 hours ago) and read 3286 times:
Depends on the coast itself.
A gradually-sloping coastline will not only produce a noticeable wave while the tsunami is still far away from shore.... but will also offer the tell-tale warning sign of an ocean drawback, which could last for up to a half hour.
A deepwater coastline may receive no warning at all, until the moment the wave strikes.