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Re: 7.0 Landers Aftershock

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     Can there REALLY be an aftershock from an EQ that happened in '92?  I
feel almost rediculous asking this but that is what is implied.  It would
have to show up continuously on a seismometer as a sine wave as it bounced
off each end of the "wave guide" or Sydney harbor!  Learn something new
everyday.

Greg
-----Original Message-----
From: Bill Polhemus <polhemus(--nospam--at)insync.net>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: Monday, October 18, 1999 11:27 AM
Subject: RE: 7.0 Landers Aftershock


>Wouldn't this be a function of the location of the epicenter? (Or is that
>the "focus"?)
>
>I mean, if a quake recurs at the same location, wouldn't that indicate it
>was related to the previous quake at the same location?
>
>> -----Original Message-----
>> From: Paul Feather [mailto:pfeather(--nospam--at)san.rr.com]
>> Sent: Saturday, October 16, 1999 12:08 PM
>> To: seaint(--nospam--at)seaint.org
>> Subject: Re: 7.0 Landers Aftershock
>>
>>
>> A question for the list.
>>
>> The Landers earthquake happened several years ago.  If I
>> remember correctly
>> the Magnitude was also around 7.0.  At what point does a new
>> earthquake
>> cease to be an "aftershock" ?
>>
>> Paul Feather
>>
>> ----- Original Message -----
>> From: <Seaintonln(--nospam--at)aol.com>
>> To: <seaint(--nospam--at)seaint.org>
>> Sent: Saturday, October 16, 1999 3:51 AM
>> Subject: 7.0 Landers Aftershock
>>
>>
>> > The news is reporting a series of earthquakes begining with a 6.6
>> aftershock
>> > of the Landers quake begining around 2:46AM this morning. Almost
>> immediately
>> > after, the high desert and the Coachella valley (low
>> desert) in the 760
>> area
>> > code, was hit with a 7.0 after shock. Within the next hour
>> there was a
>> number
>> > of after shocks around between 2.4 and 4.5 in magnitude.
>> >
>> > The epicenter has been reported by Cal Tech as 32 miles
>> north of Joshua
>> Tree
>> > and Yucca Valley. Joshua Tree area is not highly populated,
>> however, there
>> is
>> > a concentration in the towns of Yucca Valley.
>> >
>> > The quake lasted a little over 30 seconds and was a strong
>> rolling quake.
>> > Those who are calling in from the area (Palm Springs, Palm
>> Desert, La
>> Quinta)
>> > have reported no structural type damage - although it is
>> still very early
>> to
>> > tell, but I would not expect much. There is no power
>> outages reported -
>> > although I have not checked the scanners.
>> >
>> > If there is damage in the town of Joshua Tree or Yucca Valley that
>> requires
>> > the help of local engineers to assess damage, I would
>> suggest that anyone
>> who
>> > has contacts with the emergency response teams relay the
>> message to the
>> list
>> > and provide a contact for us to call.
>> >
>> > I will keep the list updated as reports come in. This is
>> not very friendly
>> to
>> > occur when some of us insomniac's just fall asleep:o)
>> >
>> > Dennis S. Wish PE
>> >
>>
>>
>>
>
>