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Co-seismic Earthquake Lights: The Underlying Mechanism

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Abstract

Earthquake lights (EQLs) have long been considered mysterious natural phenomena, for which no good physical explanation seemed to be available. Crucial to understanding EQLs, in particular the intense flashes of light bursting out of the ground while S waves propagate, is the presence of peroxy defects in igneous rocks, in particular in gabbroic rocks that typically fill the subvertical dykes in regions of past extensional tectonics. The peroxy defects tend to locate along grain boundaries or may even link adjacent mineral grains, making them highly susceptible to ever so slight displacements of mineral grains. Thus, the passage of an S wave will instantly activate peroxy bonds. If the number density of the stress-activated peroxy is so high that their delocalized wave functions overlap, the entire rock volume must instantly expand, supported from within by an electronic degeneration pressure. This process will be followed by a momentary dissociation of the peroxy defects, generating e′ and h· charge carriers, causing the volume to instantly contract again, at least partly. If an electric discharge can burst out from the top of the dyke, removing some of the charge carriers and generating an EQL, an additional volume contraction can be expected occur.

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Notes

  1. Earthquake lights, including lightning flashes from the ground, seem to be limited to the presence of mafic dykes linked to extensional tectonics (Thériault et al. 2014). When EQLs are reported from areas where sedimentary rocks are prevalent at the surface, they may actually come from the top of geologically old dykes that are covered by sediments.

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Acknowledgements

I thank an anonymous reviewer tor very insightful comments and suggestions. This study draws on work that was supported by the NASA Ames Research Center through several “Director’s Discretionary Fund” (DDF) grants, by the NASA “Earth Surface and Interior” (ESI) Grant 2010 NNX08AG81G_S03, and through a Goddard Earth Science and Technology (GEST) Fellowship at the Geodynamics Branch, NASA Goddard Space Flight Center. I thank Dr. Bobby SW Lau and Dr. Akihiro Takeuchi for their contributions to the experimental work. I thank Professor Charles W. Schwartz, Department of Civil and Environmental Engineering, University of Maryland, for laboratory support.

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Freund, F. Co-seismic Earthquake Lights: The Underlying Mechanism. Pure Appl. Geophys. 176, 3439–3450 (2019). https://doi.org/10.1007/s00024-019-02142-2

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