https://suspicious0bservers.org/wp-c...04/Paper-1.pdfI located the 2015 paper.
Language ranged from :
* 'reveals'
* 'maybe'
* 'potential'
* 'may'
* 'indicative'
* 'worthwhile to consider'
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' lightning underground...... exceeding 1-million amperes' ( no voltage, no Watts, no Power )
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Earth's lithosphere, as a 'capacitor' is introduced, however, nothing is volunteered with respect to any known connection between magneto-telluric potential and fault-rupture triggering.
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There is a Friedemann Freund of NASA , who has spoken of underground lightning, electric currents in igneous magmatic rock, created under tectonic stress/strain at fault boundaries, as oxygen bonds in the lattice structure of basaltic olivines are broken, free electrons liberated, creating a plasma-like state, which at Earth's surface, ionizes local atmosphere, creating bursts of light, flashes, avalanches.
Friedemann mentions that the piezoelectric effect isn't strong enough to produce this, nor the triboelectric effect.
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I haven't found the citation for the actual earthquake predictions. I'll keep looking.