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Re: Mistreatment of Seismology Issues[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Mistreatment of Seismology Issues
- From: "Kenton Buzbee" <kbuzbee(--nospam--at)earthlink.net>
- Date: Wed, 21 Oct 1998 21:36:18 -0700
<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.
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