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Crater Could Solve 1908 Tunguska Meteor Mystery
Space.com ^ | 06:27 26 June 2007 ET | By Dave Mosher - Staff Writer

Posted on 06/27/2007 6:16:57 PM PDT by raygun

In late June of 1908, a fireball exploded above the remote Russian forests of Tunguska, Siberia, flattening more than 800 square miles of trees. Researchers think a meteor was responsible for the devastation, but neither its fragments nor any impact craters have been discovered.

Astronomers have been left to guess whether the object was an asteroid or a comet, and figuring out what it was would allow better modeling of potential future calamities.

Italian researchers now think they've found a smoking gun: The 164-foot-deep Lake Cheko, located just 5 miles northwest of the epicenter of destruction.

"When we looked at the bottom of the lake, we measured seismic waves reflecting off of something," said Giuseppe Longo, a physicist at the University of Bologna in Italy and co-author of the study. "Nobody has found this before. We can only explain that and the shape of the lake as a low-velocity impact crater."

Should the team turn up conclusive evidence of an asteroid or comet on a later expedition, when they obtain a deeper core sample beneath the lake, remaining mysteries surrounding the Tunguska event may be solved.

The findings are detailed in this month's online version of the journal Terra Nova.

Submerged evidence

During a 1999 expedition, Longo's team didn't plan to investigate Lake Cheko as an impact crater, but rather to look for meteoroid dust in its submerged sediments. While sonar-scanning the lake's topography, they were struck by its cone-like features.

"Expeditions in the 1960s concluded the lake was not an impact crater, but their technologies were limited," Longo said. With the advent of better sonar and computer technologies, he explained, the lake took shape.

Going a step further, Longo's team dove to the bottom and took 6-foot core samples, revealing fresh mud-like sediment on top of "chaotic deposits" beneath. Still, Longo explained the samples are inconclusive of a meteorite impact.

"To really find out if this is an impact crater," Long said, "we need a core sample 10 meters (33 feet) into the bottom" in order to investigate a spot where the team detected a "reflecting" anomaly with their seismic instruments. They think this could be where the ground was compacted by an impact or where part of the meteorite itself lies: The object, if found, could be more than 30 feet in diameter and weigh almost 1,700 tons-the weight of about 42 fully-loaded semi-trailers.

Caution for now

From a UFO crash to a wandering black hole, wild (and wildly unsupported) explanations for the Tunguska event have been proposed. Alan Harris, a planetary scientist at the Space Science Institute in Boulder, Colorado, said the proposal by Longo's team isn't one of them.

"I was impressed by their work and I don't think it's something you can wave off," said Harris, who was not involved in the research.

Longo and his team "are among the recognized authorities on Tunguska" in the world, Harris told SPACE.com. "It would be thrilling to dig up chunks of the meteor body, if they can manage to. It would lay the question to rest whether or not Tunguska was a comet or asteroid."

Some researchers, however, are less confident in the team's conclusions.

"We know from the entry physics that the largest and most energetic objects penetrate deepest," said David Morrison, an astronomer with NASA's Ames Research Center. That only a fragment of the main explosion reached the ground and made a relatively small crater, without creating a larger main crater, seems contradictory to Morrison.

Harris agreed that physics could work against Longo's explanation, but did note that similar events-with impact craters-have been documented all over the world.

"In 1947, the Russian Sikhote-Alin meteorite created 100 small craters. Some were 20 meters (66 feet) across," Harris said. A site in Poland also exists, he explained, where a large meteor exploded and created a series of small lakes. "If the fragment was traveling slowly enough, there's actually a good chance (Longo's team) will unearth some meteorite material," Harris said.

Longo's team plans to return to Lake Cheko next summer, close to the 100th anniversary of the Tunguska Event. "This is important work because we can make better conclusions about how cosmic bodies impact the Earth, and what they're made of," Longo said. "And it could help us find ways to protect our planet from future impacts of this kind."


TOPICS: Miscellaneous; News/Current Events; Technical
KEYWORDS: catastrophism; craters; deepimpact; geology; godsgravesglyphs; impactcraters; lakecheko; russia; siberia; tunguska
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1 posted on 06/27/2007 6:16:58 PM PDT by raygun
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To: raygun

BUMP!


2 posted on 06/27/2007 6:24:13 PM PDT by Publius6961 (MSM: Israelis are killed by rockets; Lebanese are killed by Israelis.)
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To: raygun

ftp://members.aol.com/dgresh2/ghostbusters/ok.wav

;-)


3 posted on 06/27/2007 6:25:34 PM PDT by ButThreeLeftsDo (Fight Crime. Shoot Back.)
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To: raygun

Interesting.


4 posted on 06/27/2007 6:26:37 PM PDT by GW and Twins Pawpaw (Sheepdog for Five [My grandkids are way more important than any lefty's feelings!])
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To: raygun

It was an early test of Tesla’s death ray. I hear Ron Paul agrees with me.


5 posted on 06/27/2007 6:27:07 PM PDT by Uriah_lost ("build bridges where you can - but draw lines where you must." -Fred D Thompson)
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To: SunkenCiv

Ping


6 posted on 06/27/2007 6:28:20 PM PDT by indcons (Islamic Religious Services Will Be Held at the Firing Range At 0800 Daily.)
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To: raygun

It was global warming run amok.


7 posted on 06/27/2007 6:29:46 PM PDT by Zack Nguyen
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To: raygun

The human race is probably due to be wiped out by a meteorite explosion at some point in the near future. We can stave off the event, however, by ensuring the complete destruction of Western civilization, Western culture, and Western values. But we had better do it now, before it’s too late.


8 posted on 06/27/2007 6:34:34 PM PDT by Mr Ramsbotham (Laws against sodomy are honored in the breech.)
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Comment #9 Removed by Moderator

To: Uriah_lost

Imagine that! Tesla unknowingly saving the world at the moment he tests his death rayby, thereby blowing up an asteroid at the moment it enters the atmosphere. Horrified at the immense destructive capabilities of his death ray he immediately destroys it and the plans.

Wonder what would’ve been the result if instead of the asteroid being publverized by the Tesla Death Ray, a Chixelube sized crater was made in the middle of Siberia.

Nah.


10 posted on 06/27/2007 6:36:05 PM PDT by raygun (I'm not fixin' the house cause I'm gonna be movin . Gotta move out cause the house is all run down.)
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To: HillaryChavez

“The stupid ass Liberals still believe a U.F.O. crashed in Siberia in 1908. why, why, why are Liberals so goddamn retarded ???!!!”

Posts like these make the rest if us look stupid by association. I smell troll.


11 posted on 06/27/2007 6:40:46 PM PDT by indcons (Islamic Religious Services Will Be Held at the Firing Range At 0800 Daily.)
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To: raygun
Photo Sharing and Video Hosting at Photobucket
12 posted on 06/27/2007 6:41:01 PM PDT by SWAMPSNIPER (THE SECOND AMENDMENT IS A MATTER OF FACT, NOT A MATTER OF OPINION)
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To: raygun

That’s some good stuff!
Do you smoke it or eat it? heh

Have you seen any of this stuff?
http://www.earthpulse.com/src/category.asp?catid=1

Haarp is the modern outcome of the deathray research, ya know....


13 posted on 06/27/2007 6:44:43 PM PDT by Uriah_lost ("build bridges where you can - but draw lines where you must." -Fred D Thompson)
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Comment #14 Removed by Moderator

To: raygun

...”but neither its fragments nor any impact craters have been discovered. “

That’s because it was a methane gas explosion.


15 posted on 06/27/2007 6:49:31 PM PDT by taxed2death (A few billion here, a few trillion there...we're all friends right?)
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To: HillaryChavez

One week on FR? No wonder you don’t care about making a fool of yourself on the forum. You’ll learn in due course. Your posting history reeks of an illeterate, and possibly, a rearded mind.

I feel sorry for you. Are you one of those “children left behind” that we hear so much about?


16 posted on 06/27/2007 6:54:06 PM PDT by indcons (Islamic Religious Services Will Be Held at the Firing Range At 0800 Daily.)
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To: indcons

illeterate=illiterate


17 posted on 06/27/2007 6:54:38 PM PDT by indcons (Islamic Religious Services Will Be Held at the Firing Range At 0800 Daily.)
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To: HillaryChavez

I don’t think ones politics incline one towards UFO belief.


18 posted on 06/27/2007 6:54:58 PM PDT by Melas (Offending stupid people since 1963)
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To: HillaryChavez
Corrected post - "One week on FR? No wonder you don’t care about making a fool of yourself on the forum. You’ll learn in due course. Your posting history reeks of an illiterate, and possibly, a retarded mind. I feel sorry for you. Are you one of those “children left behind” that we hear so much about?"
19 posted on 06/27/2007 6:55:41 PM PDT by indcons (Islamic Religious Services Will Be Held at the Firing Range At 0800 Daily.)
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To: raygun
but rather to look for meteoroid dust

I could have sworn they found said dust embedded in trees that survived the blast.

20 posted on 06/27/2007 6:58:22 PM PDT by Calvin Locke
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