Skip to comments.Sandia supercomputers offer new explanation of Tunguska disaster
Posted on 12/18/2007 10:12:19 AM PST by crazyshrink
Smaller asteroids may pose greater danger than previously believed
INCINERATION POSSIBLE - Fine points of the "fireball" that might be expected from an asteroid exploding in Earth's atmosphere are indicated in a supercomputer simulation devised by a team led by Sandia researcher Mark Boslough. (Photo by Randy Montoya ) Download 300dpi JPEG image (Media are welcome to download/publish this image with related news stories.)ALBUQUERQUE, N.M. The stunning amount of forest devastation at Tunguska a century ago in Siberia may have been caused by an asteroid only a fraction as large as previously published estimates, Sandia National Laboratories supercomputer simulations suggest.
The asteroid that caused the extensive damage was much smaller than we had thought, says Sandia principal investigator Mark Boslough of the impact that occurred June 30, 1908. That such a small object can do this kind of destruction suggests that smaller asteroids are something to consider. Their smaller size indicates such collisions are not as improbable as we had believed.
Because smaller asteroids approach Earth statistically more frequently than larger ones, he says, We should be making more efforts at detecting the smaller ones than we have till now.
The new simulation which more closely matches the widely known facts of destruction than earlier models shows that the center of mass of an asteroid exploding above the ground is transported downward at speeds faster than sound. It takes the form of a high-temperature jet of expanding gas called a fireball.
This causes stronger blast waves and thermal radiation pulses at the surface than would be predicted by an explosion limited to the height at which the blast was initiated.
Our understanding was oversimplified, says Boslough, We no longer have to make the same simplifying assumptions, because present-day supercomputers allow us to do things with high resolution in 3-D. Everything gets clearer as you look at things with more refined tools.
Sandia is a National Nuclear Security Administration laboratory.
The new interpretation also accounts for the fact that winds were amplified above ridgelines where trees tended to be blown down, and that the forest at the time of the explosion, according to foresters, was not healthy. Thus previous scientific estimates had overstated the devastation caused by the asteroid, since topographic and ecologic factors contributing to the result had not been taken into account.
Theres actually less devastation than previously thought, says Boslough, but it was caused by a far smaller asteroid. Unfortunately, its not a complete wash in terms of the potential hazard, because there are more smaller asteroids than larger ones.
Boslough and colleagues achieved fame more than a decade ago by accurately predicting that that the fireball caused by the intersection of the comet Shoemaker-Levy 9 with Jupiter would be observable from Earth.
Simulations show that the material of an incoming asteroid is compressed by the increasing resistance of Earths atmosphere. As it penetrates deeper, the more and more resistant atmospheric wall causes it to explode as an airburst that precipitates the downward flow of heated gas.
Because of the additional energy transported toward the surface by the fireball, what scientists had thought to be an explosion between 10 and 20 megatons was more likely only three to five megatons. The physical size of the asteroid, says Boslough, depends upon its speed and whether it is porous or nonporous, icy or waterless, and other material characteristics.
Any strategy for defense or deflection should take into consideration this revised understanding of the mechanism of explosion, says Boslough.
One of most prominent papers in estimating frequency of impact was published five years ago in Nature by Sandia researcher Dick Spalding and his colleagues, from satellite data on explosions in atmosphere. They can count those events and estimate frequencies of arrival through probabilistic arguments, says Boslough.
The work was presented at the American Geophysical Union meeting in San Francisco on Dec. 11. A paper on the phenomenon, co-authored by Sandia researcher Dave Crawford and entitled Lowaltitude airbursts and the impact threat has been accepted for publication in the International Journal of Impact Engineering.
The research was paid for by Sandias Laboratory-Directed Research and Development office.
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Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin company, for the U.S. Department of Energys National Nuclear Security Administration. With main facilities in Albuquerque, N.M., and Livermore, Calif., Sandia has major R&D responsibilities in national security, energy and environmental technologies, and economic competitiveness.
Whereupon, he offers us 750 words -- without a single clue as to the asteroid's size, before or after the simulation.
--I suspect "garbage in, garbage out," still applies--
Great movie reference!
Shaped Charge. Sort of a RPG from space.
Smaller asteroids may pose greater danger than previously believedThat gets the Well-Duh award nomination for the week.
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The Horrendous Space Kablooey at JupiterWhen astronomers on seven continents aimed every available telescope and instrument at Jupiter during the week of July 16, there were many predictions, ranging from "The Big Fizzle" to major impacts, to the disruptions of personal horoscopes and other catastrophes (Ice Ages) here on Earth. Although the magnitude of the damage done to Jupiter came as a pleasant surprise, equally surprising to scientists was that the event had actually produced visible results.
(the fate of comet Shoemaker Levy 9)
by Paul Schenk and Julie Moses
Shoemaker-Levy 9, LPIB, August 1994, Number 72
Than a bread box...???
Perhaps the tunguska trees and the bristlecone pines shared a similar fate:
“90-TH ANNIVERSARY OF THE TUNGUSKA PROBLEM”
Krasnoyarsk (Russia), June 30 - July 2, 1998
if you don’t speak Russian, try this:
Das vadanya. Nyet. Vodka. That’s my entire Russian vocabulary. ;’)
I was a bit surprised (http://olkhov.narod.ru/conf98.htm) to read that there *is* a tectonic “explanation” for it, iow, someone has claimed that an earthquake caused the trees to fall down for miles in all direction, just in a nice round-ish crater-like arrangement, and did nothing else for many more miles in any direction. I would also wonder how the visual sighting of the incoming object (reported in contemporary newspapers in India) could be explained by tectonics. ;’)
You’re in luck..the reports from the INTERNATIONAL CONFERENCE are in english. (And cover just about everything, including methane...)
In this case the high initial potentiality could be explained not only by mechanical or electromagnetic processes, but also by a shift that occurred in the informational sphere of the planet. This shift could result both from natural and man- generated processes, caused by upsetting the informational and energy balance. Thus, the Tunguska Event could be identified with a global manifestation of the poltergeist phenomenon in the terrestrial space...
DON'T TELL ALGORE!
Moio sudno na vozdunoy poduke polno ugrey!
If that’s the plural of ‘nostril’...
[sigh] 30 or so years ago I read “The Fire Came By”, which tries to make a case for the nuclear explosion of an extraterrestrial craft which was having engine trouble. The aliens changed direction so that, in case they didn’t quite make it in time, the explosion would happen in an area with very low population density. I guess they missed the Sahara...
My hovercraft is full of eels.
so, watcha gunna do about it, hmmm?
..ok, but what about my poor twisted trees?
S RoÂdestvom Khristovym i S nastupayuÂčim Novym Godom.
Oakstioarthritis, a doctor viewed the pics and is a grain with me.
..and a very Merry Christmas and a Happy New Year to you too!
According to a book which includes the Tungusku incident, people in London could read a newspaper at night from the glow. Also there was a similar event in the Amazon forest in the mid 20th century that had a 50 mile diameter blowdown area. Wish I could find the book I read these things in, will continue to look.
also this one, and I'm glad to find it, I'd remembered it but hadn't been able to find it on the drive or online.
Possible Formation of the Guatemala Basin by the Impact of an Extraterrestrial BodyThe earth must be as frequently cratered per unit area as the moon. By a relative cross section argument, more than 13 times the number of craters the size of the maria on the moon exist, or existed, on the earth. Whether such events occur with sufficient frequency in recent geologic time to provide tangible evidence today of such cratering is uncertain. From the arguments set forth, and the continuing discovery of meteorite craters on the continents (Short, 1966, Baldwin, 1963, Dietz, 1961, and Prouty, 1952) it seems likely that the importance of the effect of extraterrestrial bodies impacting the earth has been, at least, underestimated (the Alverez's hypothesis concerning the end of the dinosaurs by such a mechanism was more than a decade in the future). Certainly there is as much evidence at present to support our hypothesis for the formation of the Guatemala Basin as other hypotheses advanced to explain the low heat flow found in this basin.
by Charles E. Corry and Miller L. Bell
With the tests for shock processes advanced by Short (1966), our hypothesis should be capable of field verification or rejection.
[1999 -- The letter of rejection from Nature for the following article is dated August 28, 1968. At the time most earth scientists would not even accept the fact that meteorites regularly impacted the earth. For example, Barringer Crater in Arizona was still thought by many to be of volcanic origin, as well as the craters on the moon. Bob Dietz had just published his work on shatter cones but I wouldn't say that had been generally accepted. There was not even general agreement on sea floor spreading and plate tectonics outside the radical few at Scripps, Woods Hole, and related institutions.]
Scientists say asteroid may hit Mars in late January
(1 in 75 chance on Jan. 30, 2008)
AP on Examiner.com | 12/20/07 | Alicia Chang - AP
Posted on 12/20/2007 9:27:00 PM EST by NormsRevenge
Is that an inkblot?
You can bet that lots of telescopes will be watching for that possibility.
SIBERIA METEORITE FLATTENS 40 SQ MILES
The Times | 7 June 2003 | Robin Shepherd
Posted on 06/09/2003 5:25:21 PM PDT by Mike Darancette
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