Originally posted by mactastic
That must have been one hell of a ride. I remember being on top of the '89 quake, and that one was only a 7.
A lot of things determine damage levels. Soil consistency, quake duration, direction and acceleration of the ground motion are just a few, not to mention type and quality of construction. The Japanese are well known for their strict earthquake-related building codes, but even they were surprised by the level of damage that occured in Kobe.
Also it seems to have been a relatively shallow 'quake, which usually means a shorter duration. It's those deep, subduction zone quakes that are the really bad ones... think Alaska's Good Friday quake. IIRC, that one lasted close to 5 minutes. Just by comparison, the '89 quake I was in lasted just 15 seconds.
Originally posted by GeeYouEye
I don't mean to say anything, but 20 miles is hardly a shallow quake.
Originally posted by Gus
I can't seem to find the link now, but about a month ago there was a scientist in Japan who staked his reputation on the fact that he could predict a large earthquake that would hit Japan. At the time, he said it would be within 5 days, and that was wrong, but he apparently did know it was coming. Wierd.
Regards,
Gus
Originally posted by G4scott
It's amazing how little damage is caused by earthquakes these days with all of the engineering that goes into making buildings and highways and things like that.
For a quake of such a size, I haven't seen or heard much about it...
Originally posted by GeeYouEye
I don't mean to say anything, but 20 miles is hardly a shallow quake.
Most of the earthquakes that cause damage are shallow focus earthquakes. The hypocenters of these earthquakes occur in the upper 60 km of Earth's crust. Intermediate focus earthquakes occur between 60 -150 km deep; and deep focus earthquakes occur at depths greater than 150 km.