Big Bang In Tunguska
- Uploaded by Ghost32 on Jul 28, 2012
- Hits: 812
The Tunguska event, or Tunguska blast or Tunguska explosion, was an enormously powerful explosion that occurred near the Podkamennaya Tunguska River in what is now Krasnoyarsk Krai, Russia, at about 7:14 a.m. KRAT (0:14 UT) on June 30 [O.S. June 17, 1908.
The explosion is believed to have been caused by the air burst of a large meteoroid or comet fragment at an altitude of 5--10 kilometres (3--6 mi) above the Earth's surface. Different studies have yielded varying estimates of the object's size, with general agreement that it was a few tens of metres across.
The number of scholarly publications on the problem of the Tunguska explosion since 1908 may be estimated at about 1,000 (mainly in Russian). Many scientists have participated in Tunguska studies, the best-known of them being Leonid Kulik, Yevgeny Krinov, Kirill Florensky, Nikolai Vladimirovich Vasiliev and Wilhelm Fast.
Although the meteoroid or comet burst in the air rather than hitting the surface, this event is still referred to as an impact. Estimates of the energy of the blast range from 5 to as high as 30 megatons of TNT (21--130 PJ), with 10--15 megatons of TNT (42--63 PJ) the most likely—roughly equal to the United States' Castle Bravo thermonuclear bomb tested on March 1, 1954, about 1,000 times more powerful than the atomic bomb dropped on Hiroshima, Japan, and about one-third the power of the Tsar Bomba, the largest nuclear weapon ever detonated. The explosion knocked over an estimated 80 million trees covering 2,150 square kilometres (830 sq mi). It is estimated that the shock wave from the blast would have measured 5.0 on the Richter scale. An explosion of this magnitude is capable of destroying a large metropolitan area. This possibility has helped to spark discussion of asteroid deflection strategies.
The Tunguska event is the largest impact event over land in Earth's recent history. Impacts of similar size over remote ocean areas would most likely have gone unnoticed before the advent of global satellite monitoring in the 1960s and 1970s.
FAIR USE NOTICE: The material on this channel is provided solely for educational and informational purposes. It may contain copyrighted material, the use of which has not been specifically authorized by the copyright owner. Infringement of copyright is not intended. The material is made available to help educate people about health related issues. It is believed that this constitutes a 'FAIR USE' of any such copyrighted material as provided for in Title 17, section 107 of the US Copyright Law. The material is distributed without profit to those who would like to use such material for research and educational purposes. FAIR USE NOTICE The use of the media material found on this channel is protected by the Fair Use Clause of the U.S. Copyright Act of 1976, which allows for the rebroadcast of copyrighted materials for the purposes of commentary, criticism, and education.
This site may contain copyrighted material whose use has not always been specifically authorized by the copyright owner. Users may make such material available in an effort to advance awareness and understanding of issues relating to civil rights, economics, individual rights, international affairs, liberty, science & technology, etc. We believe this constitutes a
'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. In accordance with Title 17 U.S.C.Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes.