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Open Access

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

Earth, Planets and Space200759:BF03352060

https://doi.org/10.1186/BF03352060

Received: 27 August 2007

Accepted: 9 October 2007

Published: 30 October 2007

Abstract

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.

Key words

Anisotropy of magnetic susceptibilitymagnetic hardeningstress wavesbasaltic andesiteimpact crater