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Re: Seattle Earthquake Intensity Maps

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I believe the acceleration in the Northridge event was about 0.7 g
horizontally and 0.6 vertically.

Stan Scholl, P.E.

On Thu, 01 Mar 2001 15:32:03 -0800 "Gerard Madden" <GMadden(--nospam--at)>
> From the map, it looks like the maximum peak ground acceleration 
> (PGA) was about 18%g or 0.18g.near the epicenter.
> Weren't Loma Prieta & Northridge PGA's much higher ? I thought some 
> spots were about 0.6g in both quakes.
> When I heard 7.0  magnitude, I was expecting huge damage on the same 
> order or worse than 89 & 94. Apparently the depth of the earthquake 
> had a large effect on the shaking intensity compared to Loma Prieta 
> which had a similar magnitude with a much shallower focus.
> -gerard