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Scattering And Absorption of Light in Planetary Regoliths
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Asteroid Risk Assessment: A Probabilistic Approach.

Jason C Reinhardt1, Xi Chen1, Wenhao Liu1

  • 1Department of Management Science and Engineering, Stanford University, Stanford, CA, 94305, USA.

Risk Analysis : an Official Publication of the Society for Risk Analysis
|July 29, 2015
PubMed
Summary

Asteroid impact risks are better understood using a new probabilistic model that provides casualty distributions, not just averages. Civil defense can help, but continued observation and deflection mission research are crucial for planetary defense.

Keywords:
Asteroidsimpact risk analysisnear-Earth objects (NEOs)planetary defense

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Area of Science:

  • Planetary Science
  • Risk Assessment
  • Civil Defense

Background:

  • The 2013 Chelyabinsk event highlighted the potential damage from near-Earth object (NEO) impacts.
  • Traditional risk estimates (e.g., average casualties) offer limited actionable insights for low-probability, high-consequence events.
  • Assessing asteroid impact risks requires a more comprehensive approach beyond simple averages.

Purpose of the Study:

  • To develop and present a probabilistic model for evaluating NEO impact risks.
  • To provide a more complete risk assessment by estimating distributions of potential casualties.
  • To evaluate the effectiveness of civil defense measures in mitigating impact consequences.

Main Methods:

  • A modularized simulation approach using probabilistic inputs.
  • Estimation of probabilistic risk metrics, including those for rare asteroid impacts.
  • Analysis of potential casualty ranges over a 100-year period.

Main Results:

  • The probabilistic model generates casualty distributions, offering a fuller picture of potential risks.
  • Civil defense measures are found to be beneficial but not a complete solution for mitigating casualties.
  • The probability of global cataclysmic impacts can be computed, though consequences are not detailed.

Conclusions:

  • Continued NEO observation is essential for planetary defense.
  • Further analysis of space mission feasibility and effectiveness for asteroid deflection is necessary.
  • Probabilistic risk assessment models provide crucial data for policy and mitigation strategies.