they were caused not by an earthquake, but by the eruption of this massive volcano, which the entire island vaporized in a matter of seconds which created such an enormous hole in the sea which was then filled with water, which instantly flashed into steam and that caused these pulses, afternoons this techtonic episode did in japan the other day, and that sent on the a huge wal much water. it killed 40,000 people in the immediate proximity with this 110, 115 foot wall of water, but it prop gated all over the indian ocean. it hit sri lanka, zanzabar and then went across africa and was recorded in west africa and nigeria all the way up to the english channel. simon, it is fascinating listening to you. i want to get back to a historical perspective.