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Shock-induced anisotropy of magnetic susceptibility: impact experiment on basaltic andesite


Changes in the anisotropy of the low-field magnetic susceptibility (AMS) of basaltic andesite were induced by decaying stress waves and subsequently quantified. An initial shock pressure of 5 GPa was generated in a block of the target rock through impacting with a cylindrical projectile. Following the impact, the maximum or minimum principal susceptibility axes of the target were reoriented toward the shock direction at low (0.5–3 GPa) or high (>3 GPa) estimated shock pressures, respectively. Subtraction of the initial AMS demonstrated a parallelism between the induced susceptibility axes and the shock direction. These results suggest a potential application of AMS as an indicator of the propagation directions of stress waves generated in rocks at terrestrial impact structures.


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Correspondence to Itoyuki Nishioka.

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Nishioka, I., Funaki, M. & Sekine, T. Shock-induced anisotropy of magnetic susceptibility: impact experiment on basaltic andesite. Earth Planet Sp 59, e45–e48 (2007).

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Key words

  • Anisotropy of magnetic susceptibility
  • magnetic hardening
  • stress waves
  • basaltic andesite
  • impact crater