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Asteroid explosion was a whopper for Earth

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Author Topic: Asteroid explosion was a whopper for Earth  (Read 76 times)
Lisa Wolfe
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Posts: 4692

« on: November 01, 2009, 06:25:56 pm »

Preliminary investigation
A preliminary look at the incident has been performed by Canadian researchers Peter Brown and graduate student Elizabeth Silber, of the Meteor Infrasound group in the department of Physics and Astronomy at the University of Western Ontario in London, Ontario.

The researchers made a detailed examination of all International Monitoring System infrasound stations of the Comprehensive Nuclear-Test-Ban Treaty Organization. An initial look found that a total of 11 stations showed probable signals from a large explosion.

Based on their scrutiny of the infrasound records, the Canadian research team reported that a large (40-50 kilotons of TNT) bolide detonation occurred near the coastal city of Bone in South Sulawesi, Indonesia. The infrasonic geolocation is not precise enough to determine if the bolide was over water or land, but it was relatively near the coast, the team reported.

Follow-on observations from other instruments or ground recovery efforts, the Canadian team added, would be very valuable in further refining this unique event. Their analysis corresponds to an object some 16-33 feet in diameter. Based on the earlier work by Brown, such objects are expected to impact the Earth on average every two to 12 years.
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