Infrasonic detection of a near-Earth object impact over Indonesia on 8 October 2009
Article first published online: 24 JUN 2011
Copyright 2011 by the American Geophysical Union.
Geophysical Research Letters
Volume 38, Issue 12, June 2011
How to Cite
2011), Infrasonic detection of a near-Earth object impact over Indonesia on 8 October 2009, Geophys. Res. Lett., 38, L12201, doi:10.1029/2011GL047633., , and (
- Issue published online: 24 JUN 2011
- Article first published online: 24 JUN 2011
- Manuscript Accepted: 8 MAY 2011
- Manuscript Revised: 3 MAY 2011
- Manuscript Received: 30 MAR 2011
 We present analysis of infrasonic signals produced by a large Earth-impacting fireball, believed to be among the most energetic instrumentally recorded during the last century that occurred on 8 October, 2009 over Indonesia. This extraordinary event, detected by 17 infrasonic stations of the global International Monitoring Network, generated stratospherically ducted infrasound returns at distances up to 17 500 km, the greatest range at which infrasound from a fireball has been detected since the 1908 Tunguska explosion. From these infrasonic records, we find the total source energy for this bolide as 8–67 kilotons of TNT equivalent explosive yield, with the favored best estimate near ∼50 kt. Global impact events of such energy are expected only once per decade and study of their impact effects can provide insight into the impactor threshold levels for ground damage and climate perturbations.