Subject: Re: San Francisco 1989/ Mexico City 1985 - Info please
From: Bill Oertell
Date: Mon, 30 Dec 1996 19:18:50 -0800
MBrad87346 wrote:
>
> I am a thirteen year old student from the U.K and I'm doing a big project
> at school on both of these earthquakes. Please could anyone who
> experienced one of these earthquakes give me any1st-hand experience
> accounts - Thank-you
> Abigail Bradley
More than happy to.
I had just arrived home from work and had made a cup of coffee. I
was sitting at my kitchen table enjoying that cup of coffee whilst
perusing what I had missed in the morning paper.
I noticed my chair starting to move forward and backward and
immediately realized that I was experiencing an earthquake. The motion
was relatively mild, so I didn't think much of it at the moment, though
I did notice that the motion seemed different than past quakes; it was
more rapid. The question of whether or not I should seek cover occured
to me.
Just as I had that thought, the motion changed. I immediately
realized that I had just experienced the passage of the P and S waves,
and if I could feel that, the L waves were right behind.
As soon as I got under the nearest doorway, the building started to
shake violently. The walls were contorting into angles I didn't think
were possible. The initial arrival of the L wave threw me in the air
and to my right (north). I pulled a muscle in my right calf in my
attempts at remaining upright (successful, btw).
When the shaking stopped I was both suprised and relieved.
Considering the intensity of the quake, it should have lasted longer. I
really thought the building was going to come down around my ears.
That evening we ate by cooking a barbeque.
--
Bill
------------------------------------
| If everything is possible, |
| nothing is knowable. Be skeptical.|
------------------------------------
Subject: Re: new meteor crater in South America?
From: bsandle@southern.co.nz (Brian Sandle)
Date: 1 Jan 1997 14:49:11 GMT
Greg Reid (RotnAppl@ix.netcom.com) wrote:
:
: Oh hell! Let's ask one of the numerous U.S. Gov. intelligence agencies!
: They have the whole god damm place wired for sound, rf, infrared, uv, and
: any other portion of the electromagnetic (and not!) spectrum.
:
: Greg Reid
:
:
:
: In article <59t0nc$f9h@orm.southern.co.nz>, bsandle@southern.co.nz (Brian
: Sandle) wrote:
:
: > Cole Pierce (pierce@pat.mdc.com) wrote:
: > : From the skeptical fingers of bsandle@southern.co.nz (Brian Sandle)
: > : Cole Pierce (pierce@pat.mdc.com) wrote:
: > : >: Unfortunately, the CNN article contains some inaccuracies that affect the
: > : >: credibility of the reporter. For one, the meteorite forming the Winslow
: > : >: Meteor Crater is commonly attributed to an object from 50 to 100 feet in
: > : >: diameter. I have never seen an estimate as large as the one in the
: article.
: > : >
: > : >It is the crater, not the meteor that had that size.
: > :
: > : IIRC, the article mentioned the meteorite as being 180 feet in
: diameter. This
: > : is 2-3 times as large as the commonly accepted figure. I was certainly not
: > : referring to the size of the crater.
: > :
: > :
: > : >Probably someone speculating what a very large meteor would do. It sounds
: > : >as if someone is spreading confusion here to get the story debunked.
: > :
: > : The latest information out of Sky & Telescope is (quote), "The Associated
: > : Press report of a 50-meter-wide crater is unconfirmed and probably false."
: > : Maybe somebody NEEDED to debunk the story .. not with confusion but
: with fact.
: > :
: > : gun one
: >
: > 50 meters is 164 feet. A 180 foot meteor would dig a very large crater.
Partly just to keep this going in case someone sees it after the break, I
ask at what speed meteors of various sizes can arrive at ground level not
having burnt up. Therefore what energy say compared to the atomic bombs.
The Maralinga, Australia, British test about the size of a Hiroshima bomb
was on a tower 110m tall and made a shallow crater 500 m across. I'm not
sure how much of that kiloton range of energy was transferred to the
ground. 1 kiloton = 4x10^17 ergs.
2 tons of ammonium nitrate exploding in the ground can be registered on a
sensitive seismograph 400 kilometers away.
Let's do a calculation and look up the seismograph records.
Brian Sandle
I
: > was wondering if the blast effect we had here with the Dec 15 MM IV, say
: > quake was focused sound from some large event. But I don't think the blast
: > could have been quite so local if it had come from such a distance.
: >
: > Still no one has answered about sonic effects from quakes, or the infra
: > sound, though in the other article I reposted another connection was drawn.
: >
: > Anyway let's enjoy some fantasy till we get proper figures.
: >
: > Brian Sandle
:
: --
:
Subject: Pacific and Mexico Coast, Sept 15, 1995
From: James Salsman
Date: 2 Jan 1997 04:45:47 GMT
Dear AFTAC NDC:
Please tell me the duration between the last French
nuclear test before the deadly Mexican coastal earthquake
of 15 September 1995 and the time of that quake.
Please acknoledge this request. If possible, please post
a copy of the reply to the USENET newsgroup "sci.geo.earthquakes".
If you can't tell me, please let me know why. I'd also like
to know the cepstral parameters of both events, if you happen
to have them available. It is generally acknoleged that
earthquakes can induce other earthquakes, but the first
dreivative over time of nearly-instantanious nuclear is not
generally thought to match the impulse of more powerful
earthquakes. Since implulse is defined as the change in
momentum, I would think that the instantaniety should make
a quite large first derivative, and thus impulse.
Sincerely,
:James Salsman
To: autodrm@www.tt.aftac.gov
Href: http://www.tt.aftac.gov/
Subject: Pacific and Mexico Coast, Sept 15, 1995
From: James Salsman
Date: 2 Jan 1997 04:45:58 GMT
Dear AFTAC NDC:
Please tell me the duration between the last French
nuclear test before the deadly Mexican coastal earthquake
of 15 September 1995 and the time of that quake.
Please acknoledge this request. If possible, please post
a copy of the reply to the USENET newsgroup "sci.geo.earthquakes".
If you can't tell me, please let me know why. I'd also like
to know the cepstral parameters of both events, if you happen
to have them available. It is generally acknoleged that
earthquakes can induce other earthquakes, but the first
dreivative over time of nearly-instantanious nuclear is not
generally thought to match the impulse of more powerful
earthquakes. Since implulse is defined as the change in
momentum, I would think that the instantaniety should make
a quite large first derivative, and thus impulse.
Sincerely,
:James Salsman
To: autodrm@www.tt.aftac.gov
Href: http://www.tt.aftac.gov/
