Seasonal Variation of the Results surveyed by Means of the Electrical Prospecting Method (I)

Abstract

In May and June of 1964, on the northern foot of Mt. Asama where the Agatsuma Pyroclastic Flow covers the land surface, an electrical prospecting method was the put into practice by the author for the purpose of a survey on the ground water. His survey resulted.in recognizing the seasonal variation of the ρ-α curves and the surface Kotaki Pyroclastic Flow which is the previous land surface before the deposition of the Agatsuma Pyroclastic Flaw.
According to the ρ-α curvel the seasonal variations of the specific resistance of the Agatsuma and Kotaki Pyroclastic Flows are as follows:
(Agat Pyroclastic Flow)
In tile winter season 100×10⁴-200×10⁴ Ωcm
In the spring season 50×10⁴-150×10⁴ Ωcm
(Kotaki Pyroclastic Flow)
In the winter season 30×10⁴-150×10⁴ Ωcm
In the spring season 30×10⁴ - 70×10⁴ Ωcm