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Re: 7.0 Landers Aftershock

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     Why is this being called an aftershock?  It seems that an earthquake
has occured.  Hope everyone's OK.


Greg


-----Original Message-----
From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Saturday, October 16, 1999 1:34 PM
Subject: RE: 7.0 Landers Aftershock


>Paul,
>
>After this quake and the previous Landers EQ that caused buildings in
Phoenix
>to sway and creak and caused the strong motion instrument at the Palo Verde
>Nuclear Generating Plant to trigger, don't you think that it is time to
>eliminate Seismic Zone 1 from *all* parts of Arizona?  Paul, can you check
>with the VA Hospital in Phoenix to see if their strong motion instrument
>triggered?  You may have to do some digging to find someone that knows that
>they have one.  (Is there someone from Menlo Park on the list that could
>answer this question?)
>
>While the EQ physically woke you and your wife up (and prompted a very
>germane question from her), I would hope that it also woke up all
Structural
>Engineers in Arizona to the absurdity of having Seismic Zone 1 in Arizona.
>
>It is well known that there is a geologic "duct" that causes earthquakes
east
>of the coast mountains in California to be felt in Phoenix, but not so
>readily in Tucson.  (A similar geologic "duct" exists between Nevada and a
>remote area in Siberia in the former USSR, which is where the Russians
>constructed a seismic station to monitor nuclear tests in the Nevada
>desert.)  While Tucson is not so susceptible to California earthquakes,
>faults in southern Arizona and northern Mexico, namely the Piticachi (sp?)
>fault have caused problems in southeastern Arizona.
>
>A. Roger Turk, P.E.(Structural)
>Tucson, Arizona
>
>Paul Blomberg wrote:
>
>. > The quake woke me up this morning in Phoenix, AZ.  My  wife wanted to
know
>. > if our house was designed good enough for earthquakes.
>. >
>. > Paul F. Blomberg
>