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Re: Mistreatment of Seismology Issues

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Isn't proximity to the fault or epicenter also a very very key parameter?

Ron Fong
Fremont,  CA

In a message dated 10/22/98 4:35:44 AM Pacific Daylight Time,
kbuzbee(--nospam--at) writes:

> <snip>
>  >I would seem that there are at least 5 parameters that would help in
>  >determining the damage that can be expected from an earthquake:
>  >
>  >1) Richter magnitude
>  >
>  >2) Duration
>  >
>  >3) Frequency content
>  >
>  >4) The characteristics of the structures being excited.
>  >
>  >5) Accelerations
>  >
>  <snip>Anyone care to add (or modify, or delete) from the above list?
>  >It might be informative (for me, at least!)
>  >
>  I audited the first few weeks of a graduate level soil dynamics class
>  recently at UCLA, and I would have to add to the list:
>  6) soil characteristics.  The '85 (?) Mexico City earthquake was far from
>  Mexico City, with relatively minor ground motions near Mexico City, yet the
>  soil of that region amplified the accelerations tremendously--the professor
>  referred to the effect as a bowl of jelly.
>  Additionally, I must concur that Richter Magnitude alone does not tell the
>  whole story by any means.  The Modified Mercali Index was mentioned as a
>  method of correlating earthquakes and damage, from
>  MMI 1 (Not felt except by a very few under especially favorable
>  circumstances) to MMI 12 (Damage total;  practically all works of
>  construction are damaged greatly or destroyed;  waves seen on ground
>  surface;  lines of sight and level are distorted;  objects thrown into the
>  air).
>  K. Buzbee, EIT.