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  • 标题:Shock-induced anisotropy of magnetic susceptibility: impact experiment on basaltic andesite
  • 其他标题:Shock-induced anisotropy of magnetic susceptibility: impact experiment on basaltic andesite
  • 本地全文:下载
  • 作者:Itoyuki Nishioka ; Minoru Funaki ; Toshimori Sekine
  • 期刊名称:Earth, Planets and Space
  • 电子版ISSN:1880-5981
  • 出版年度:2007
  • 卷号:59
  • 期号:11
  • 页码:e45-e48
  • DOI:10.1186/BF03352060
  • 出版社:Springer Verlag
  • 摘要: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.
  • 关键词:Anisotropy of magnetic susceptibility ;magnetic hardening ;stress waves ;basaltic andesite ;impact crater
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