[meteorite-list] Publications of the Carancas event ADDITIONAL

From: Jan Hattenbach <jan.hattenbach_at_meteoritecentral.com>
Date: Wed, 10 Oct 2007 00:20:29 +0200
Message-ID: <1824191766_at_web.de>

> The Peruvian
> seismic measurement was 5 tons TNT.

This may sound odd, but where is that number from? I was talking to a geologist of the University of Arequipa, and he told me that they did record nothing at the time of the event.

Regards,

jan

> -----Urspr?ngliche Nachricht-----
> Von: "Sterling K. Webb" <sterling_k_webb at sbcglobal.net>
> Gesendet: 10.10.07 00:02:42
> An: "K. Ohtsuka" <ohtsuka at jb3.so-net.ne.jp>
> CC: meteorite-list at meteoritecentral.com
> Betreff: Re: [meteorite-list] Publications of the Carancas event ADDITIONAL


>
> Hi,
>
> After reading through those other documents
> on the Major University of San Andres website
> and concluding that they contained nothing we
> didn't already know, I realized I hadn't read the
> footnotes in the one article that had footnotes,
> and indeed I found one new piece of information
> in those footnotes: one local inhabitant of Carancas,
> Don Gregorio Iruri, was standing only 300 meters
> from the point of impact at the time of the impact.
>
> That's all, a one-sentence footnote. It astounds
> me that an "investigator," scientific or otherwise,
> had located an eye-witness to as rare an event as
> a cosmic impact but did not ask questions nor collect
> his story! What did it look like? What did it sound
> like? Was there a flash of light? How bright was it?
> How strong was the shock wave? How strong was
> the wind from the blast? Was he knocked down?
> Rolled over? Or did he stay on his feet? Was he
> deafened, even slightly? And about 1000 other
> questions...
>
> The closest living witness to a cosmic impact
> among the planet's 6.6 billion people and no one
> asked him to describe it? Makes me wonder how
> justified the second term of the biological name
> "Homo sapiens" is. Maybe we should all just stand
> around dumbly like cows. Oh, wait! -- we do.
>
> [In all fairness, the witness may have been so
> shaken as to not have had a coherent story, but even
> that fact is useful information. They say in reference
> to Don Iruri only this: "...podemos concluir que esa
> estructura tiene la t?pica caracter?stica de un cr?ter
> explosivo." Or, "...we were able to conclude that
> this structure has the typical characteristics of an
> explosive crater." So he must have described an
> explosion. Details would be nice.]
>
 Chris Peterson
> has suggested airblast effects exaggerate ground
> readings and that 1 to 2 tons TNT is more reasonable.
> Now, Brown suggests 30 tons TNT as a measurement.
> It's possible Don Iruri's story could narrow that down...
> if anybody had asked him.
>
> The LPI Impact Calculator uses the figure of an
> overpressure of 1 pound per sq. inch as a nominally
> perceptible blast force (about equal to an instantaneous
> gust of 35 mph wind). I tried using the equations from:
> http://www.fas.org/man/dod-101/sys/dumb/fae.htm
> for air-fuel explosions, an event quite similar to an
> impact vaporization. [We are considering only pressure
> effects, not flying debris nor any other possible results.]
>
> The results are that one finds the distance at which
> one would experience an overpressure of 1 pound
> per sq. inch from a one ton TNT explosion is 158
> meters, from a 5 ton event is 270 meters, but from
> a 30 ton event is 490 meters and from a one kiloton
> event is 1500 meters. [Caveat: every actual blast is
> different, affected by surface materials, reflected
> waves, and a long list of modifiers, including the
> unknown efficiency of kinetic energy conversion
> in this impact, so these estimates above have a
> potential 2-fold error in distance.]
>
>
> Sterling K. Webb
> ----------------------------------------------------------------
> ----- Original Message -----
> From: "K. Ohtsuka" <ohtsuka at jb3.so-net.ne.jp>
> To: "Sterling K. Webb" <sterling_k_webb at sbcglobal.net>
> Cc: <meteorite-list at meteoritecentral.com>
> Sent: Tuesday, October 09, 2007 7:15 AM
> Subject: Re: [meteorite-list] Publications of the Carancas event ADDITIONAL
>
>
> Hello Sterling,
>
> Thank you for letting me know your translation of
> the Bolivian publications, which is very interesting.
>
> Just before, I visited http://spaceweather.com/,
> where another latest infrasound analysis of the
> Peruvian event by Peter Brown (Univ. W. Ontario)
> is introduced. His team estimated the kinetic energy
> of the impactor about 0.03 kton TNT.
>
> Best wishes,
>
> Kastu
>
> ----- Original Message -----
> From: "Sterling K. Webb" <sterling_k_webb at sbcglobal.net>
> To: <meteorite-list at meteoritecentral.com>
> Cc: "Rob Matson" <mojave_meteorites at cox.net>; "K. Ohtsuka"
> <ohtsuka at jb3.so-net.ne.jp>
> Sent: Tuesday, October 09, 2007 9:14 AM
> Subject: Re: [meteorite-list] Publications of the Carancas event ADDITIONAL
>
>
> > Hi,
> >
> > I downloaded all the publications on the site (URL below) and
> > started translating then, but...
> >
> > One is the earlier analysis which I already translated and posted
> > a week ago. The two PowerPoint presentations are general
> > presentations of craters (very nicely done, BTW -- muy bueno!)
> > but don't mention Carancas. One is a press-release style .pdf
> > that describes the event and spends a lot of time explaining
> > what a meteorite is, that they come from the asteroids, that there
> > are craters elsewhere on the planet, that the world is not ending,
> > the usual...
> >
> > There are a few more .pdf are press releases. The only document
> > with any "specifics" is their physical estimates of the impact and
> > such, all taken from playing with the LPI online Impact Calculator;
> > I recognize the language! Like I haven't already done that 300 times
> > this last week (and you too).
> >
> > And if you're keeping score, the Bolivians (unlike the Peruvians)
> > got the Universal Time of the event right.
> >
> >
> > Sterling K. Webb
> > --------------------------------------------------------------------------
> ------
> > ----- Original Message -----
> > From: "K. Ohtsuka" <ohtsuka at jb3.so-net.ne.jp>
> > To: <meteorite-list at meteoritecentral.com>
> > Sent: Monday, October 08, 2007 9:37 AM
> > Subject: [meteorite-list] Publications of the Carancas event
> >
> >
> > Hello list members,
> >
> > I have just reached the Carancas' publication list site in Peru:
> >
> > http://fcpn.umsa.bo/fcpn/app?service=page/Planetarium_PublicationList
> >
> > where some articles have already been introduced by some list members,
> > but the rest ones are not introduced yet and seem indeed interesting,
> > although
> > I cannot understand Spanish at all.
> >
> > Does anyone translate and introduce their summary?
> >
> > Best wishes,
> >
> > Katsu OHTSUKA
> > Tokyo, JAPAN
> >
> > ______________________________________________
> > Meteorite-list mailing list
> > Meteorite-list at meteoritecentral.com
> > http://six.pairlist.net/mailman/listinfo/meteorite-list
> >
> >
>
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Received on Tue 09 Oct 2007 06:20:29 PM PDT