Re: 60th Anniversary of 1946 April Fool's Day Quake & Tsunami

Gerard Fryer <gerard@xxxxxxxxxxxxxxxxx> wrote:

The first of the aftershocks was more impulsive than the main shock, so
it felt as strong though it did not last as long.

Because the Aleutian Shelf is so shallow (about 100m) and broad
(100km), the tsunami had to begin within a minute of the main shock.
Either it was excited directly by the earthquake or the landslide
started moving right away. Scotch Cap Light was destroyed 48 minutes
after the main shock, and the tsunami travel time from the shelf edge
to the lightyhouse is 43 minutes. The aftershock was some minutes
later, leaving too little time for a tsunami from the aftershock to
reach its destination.

Thanks, Gerard!

is it known whether the first crest was the biggest? There's something
about this particular event that is very fascinating.
.