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4hv.org :: Forums :: High Voltage
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Spectacular images of volcanic lightning in the Icelandic eruption

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Move Thread LAN_403
Proud Mary
Wed Apr 28 2010, 11:07PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
 		There could of course be some triboelectric charge generated by the rubbing of particles, but the generation of a streaming potential by the forcing of a liquid through porous matter seems much more likely an explanation, because it does not depend on the interaction of particles widely separated in the triboelectric series.

see:
Rocks that Crackle and Sparkle and Glow
— Strange Pre-Earthquake Phenomena —
Friedemann T. Freund
Department of Physics, San Jose State University
NASA Ames Research Center
J. Sci. Exploration, 17, 37-71, 2003
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