[meteorite-list] Peru Again!! Ubinas, Peru volcanic bomb block crater- Smithsonian Institution-INGEMMETstudy

From: drtanuki <drtanuki_at_meteoritecentral.com>
Date: Tue, 16 Oct 2007 20:12:18 -0700 (PDT)
Message-ID: <805067.54890.qm_at_web53212.mail.re2.yahoo.com>

Hi Sterling and List,
  Sterling has hit the nail exactly on the head! No or
little impactor was left in the crater. They will
still finishing messing up the Carancas impact crater
anyway or the rain will finish it off, either way it
is likely gone....
  Happy always to read your posts. I was lucky to
just find these photos tonight while searching for HE
bomb craters in Osaka.
  No satellite imagery data has been located of the
Carancas impact crater following the event, too bad.
  Best Regards, Dirk Ross...Tokyo

--- "Sterling K. Webb" <sterling_k_webb at sbcglobal.net>
wrote:

> Hi, Dirk, List,
>
> The picture of the 2-meter "bomb" shows there
> no distinction between an impact pit (which is what
> this is) and a true crater, formed by an explosion.
> The shape (but not the size) is the same for both.
> The object's mass is up to 10 tons, but the velocity
> was low, probably no more than 100 m/sec (depends
> on how high it was tossed out of the volacano). A
> "pit" is a low-energy event; a crater is not, but
> the
> shape's the same.
>
> The geometry of the pit or crater is very close
> to that perfect conical shape of the mathematical
> crater models with their 3:1 width-to-depth. But
> since
> it's the energy that determines the crater, you
> could
> have gotten the same crater that was produced by
> ten tons at 100 m/sec with 100 kilos at 1000 m/sec,
> or 1 kilo at 10,000 m/sec.
>
> It's a picture like this that demonstrates the
> true
> silliness of the idea that a "ten-ton monster" is
> hiding
> in the Carancas crater. The URL's a picture of a
> ten-meter crater (OK, pit) with a ten ton impactor
> sitting in it. Does it look to you like it's hiding?
> I think
> we'd have noticed a ten-monster in Carancas... if it
> was intact!
>
>
> Sterling K. Webb
>
---------------------------------------------------------
> ----- Original Message -----
> From: "drtanuki" <drtanuki at yahoo.com>
> To: <meteorite-list at meteoritecentral.com>
> Sent: Tuesday, October 16, 2007 8:01 PM
> Subject: [meteorite-list] Peru Again!! Ubinas,Peru
> volcanic bomb block
> crater- Smithsonian Institution-INGEMMETstudy
>
>
> Hi List,
> Thought some of you might be interested in seeing
> another crater in Peru. Take a look at the photo
> page
> at least! Best Regards, Dirk Ross...Tokyo
>
>
> Main Page:
>
http://www.volcano.si.edu/reports/bulletin/contents.cfm?issue=3110&display=complete
>
>
> Photo:
>
>
http://www.volcano.si.edu/volcanoes/region15/peru/ubinas/3110ubi7.jpg
>
> Figure 14. Ubinas eruptions in May 2006 ejected
> volcanic bombs, seen here in their impact craters. A
> 2-m-diameter bomb (top), struck ~ 200 m from the
> crater. A crater containing a large, partly buried,
> smooth-faced bomb is seen in the bottom photo.
> Numerous bucket-sized angular blocks appear on the
> far
> side of the impact crater. Two geologists stand
> adjacent a ~ 2-m-long block that ended up on the
> impact crater's rim. The bomb fragments were of
> andesitic composition. Top photo from Salazar and
> others (2006); bottom photo from INGEMMET website.
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Received on Tue 16 Oct 2007 11:12:18 PM PDT