VLF-MT法による火山地域の地質構造探査 : 富士山北麓を例にして

概要

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The geological structure of Yaimagahara (Narusawa village in Prefecture Yarrianashi, northern foot of Mt. Fuji) was investigated by means oi VLF-MT method. This area is characterized by volcanic ejecta (basaltic lava flow, tuff breccia, scoria and so on) resulted from the eruption of Mt. Fuji volcano. VLF-MT measurements were made along 17 lines using 50 m station interval. Apparent resistivity and phase angle between magnetic and electric field were measured at each station. When interpreting the structure by two-layer model, evaluation of the resistivity of the top layer ρ_1 must be done. This evaluation was done in following manner :(1) Value for apparent resistivity at station where value for phase angle is between 41-49 degree is regarded as value for ρ_1 and this value is used as ρ_1 near this station. (2)In the area where no station that have a value for phase angle 41-49 degree is present, based on the known geology (boring data, outcrop and so on) , the value for ρ_1 is estimated from the geological column. The result of survey indicated that the VLF-MT method is useful for estimation of structure in volcanic area where no outcrops are present.
一般社団法人日本応用地質学会の論文
1993-08-10