Abstract
Banded low-frequency radiofrequency (r.f.) signals, very low frequency propagation and light emission have been recorded to precede, accompany and follow some large earthquakes1–3, and mechanisms to account for these phenomena have been suggested recently4,5, discussed briefly by Chi-Yu King (ref. 6 and references therein) and summarized by Sadovski7. Banded r.f. emission has also been detected in a series of laboratory tests in which samples of granite and other hard rocks were fractured under static pressure8. Here we report observations of banded r.f. emission generated during and after macroscopic hypervelocity impacts of small projectiles on hard rocks. We believe that our results may help to further the understanding of earthquake emissions and the mechanism of impact magnetization9, both of which are associated with the fracturing of rocks under some kind of stress.
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Bianchi, R., Capaccioni, F., Cerroni, P. et al. Radiofrequency emissions observed during macroscopic hypervelocity impact experiments. Nature 308, 830–832 (1984). https://doi.org/10.1038/308830a0
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DOI: https://doi.org/10.1038/308830a0
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