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Politics : Formerly About Advanced Micro Devices
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To: combjelly who wrote (213895)12/26/2004 6:29:03 PM
From: neolib   of 1585965
 
About now I'm getting less worried about global warming, and more worried about a mountain in the Canary Islands.

A computer model of a future collapse on La Palma (click here to go to pdf of paper) by Steven Ward of the University of California at Santa Cruz and Simon Day of BHRC, indicates that this is not the case. Although wave dispersion effects do significantly modify the waves, nevertheless the results indicate that these will retain a significant proportion of their energy as they propagate outwards from the Canaries (where their initial heights are around a kilometre, in agreement with the other independent predictions by Fritz and others) towards the USA, Europe and northern Brazil. Tsunamis travel at high speeds in the deep ocean ---- as fast as passenger jet aircraft ---- and then slow down and pile up, increasing their height, as they enter shallow water. The upshot of the model is that it predicts that between 6 and 9 hours after the collapse of the Cumbre Vieja, tsunami waves with amplitudes of around 50 metres will strike the entire western seaboard of the Atlantic: these values are consistent with the size of the giant boulders and other deposits in the Bahamas, lending support to the model. Hours before the waves arrive in America, the coasts of the Canaries and of western Africa and Europe will have been swept by waves that have refracted around the submarine flanks of La Palma. This last is a complex process, and so it is difficult to predict the size of waves that will strike Europe in particular: but the model predicts that the waves in the Canaries may run up to several hundreds of metres above sea level on the steep slopes of the islands.

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