No. 16: Summer 1981
Hedervari supports the hypothesis that some earthquake lights, particularly those preceding strong regional quakes, are caused by the release and ignition of gases from the stressed rocks. Several curious features of earthquake lights favor this assertion:
(Hedervari, Peter; "The Possible Correlations between Crustal Deformations Prior to Earthquakes and Earthquake Lights," Seismological Society of America, Bulletin, 71:371, 1981.)
Comment. In essense, Hedervari is saying that earthquake lights often do not occur where rock stresses are greatest and that the piezoelectric effect may not be the whole story.
Reference. Many examples of earthquake lights are presented in our Catalog: Lightning, Auroras, in category GLD8. To order this book, visit: here.