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The flux of small near-Earth objects colliding with the Earth

Author

Listed:
  • P. Brown

    (University of Western Ontario
    Los Alamos National Laboratory)

  • R. E. Spalding

    (Sandia National Laboratory)

  • D. O. ReVelle

    (Los Alamos National Laboratory)

  • E. Tagliaferri

    (ET Space Systems)

  • S. P. Worden

    (Peterson Air Force Base, Colorado Springs)

Abstract

Asteroids with diameters smaller than ∼50–100 m that collide with the Earth usually do not hit the ground as a single body; rather, they detonate in the atmosphere1. These small objects can still cause considerable damage, such as occurred near Tunguska2, Siberia, in 1908. The flux of small bodies is poorly constrained, however, in part because ground-based observational searches pursue strategies that lead them preferentially to find larger objects3. A Tunguska-class event—the energy of which we take to be equivalent to 10 megatons of TNT—was previously estimated to occur every 200–300 years, with the largest annual airburst calculated to be ∼20 kilotons (kton) TNT equivalent (ref. 4). Here we report satellite records of bolide detonations in the atmosphere over the past 8.5 years. We find that the flux of objects in the 1–10-m size range has the same power-law distribution as bodies with diameters >50 m. From this we estimate that the Earth is hit on average annually by an object with ∼5 kton equivalent energy, and that Tunguska-like events occur about once every 1,000 years.

Suggested Citation

  • P. Brown & R. E. Spalding & D. O. ReVelle & E. Tagliaferri & S. P. Worden, 2002. "The flux of small near-Earth objects colliding with the Earth," Nature, Nature, vol. 420(6913), pages 294-296, November.
    • Handle: RePEc:nat:nature:v:420:y:2002:i:6913:d:10.1038_nature01238
    DOI: 10.1038/nature01238
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    Cited by:

    1. Arnaud Mignan & Stefan Wiemer & Domenico Giardini, 2014. "The quantification of low-probability–high-consequences events: part I. A generic multi-risk approach," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 73(3), pages 1999-2022, September.
    2. Arnaud Mignan & Patricia Grossi & Robert Muir-Wood, 2011. "Risk assessment of Tunguska-type airbursts," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 56(3), pages 869-880, March.

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