A Study on the Luminous Phenomena Accompanied with Earthquake(Part U)
Yasui, Y.
Abstract
In previous Part T, the author reported on the outline of past contributions for luminous phenomena accompanied with earthquakes and the details of these phenomena which appeared at the time of recent earthquakes, especial1y Matsushiro earthquake swarm during 1965-1967.
In this Part U, the origin of those luminescence is considered from the observed behavior, the fact that an unusual fall of atmospheric electric potential gradient was observed by G.Kondo at the time of earthquake at the Matsushiro seismological observatory and geological point of view in the vicinity of the mountain summit on which the luminescence appeared. In conclusion, the author presumes that the luminescence is essentially an atmospheric electric phenomenon, e.g. a large scale point discharge, occurring in low atmosphere contacting with the ground surface and this phenomenon may be generated by violent ultra short period air-oscillation occurring at the time of earthquake. Moreover, a few of new events are appended.
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