日本海中部地震域における地磁気垂直成分観測

概要

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In order to investigate magnetic structure beneath the Japan sea, especially the aftershock area of the 1983 Nihonkai-chubu earthquake, the geomagnetic vertical components were observed by the fluxgate magnetometer with PCM telemeter installed on the balloon B_5-123 on July 12 1985. The observed values were averaged every 57 seconds which coincide with the rotational period of the sensor to obtain accurate geomagnetic vertical components without influence of the fluctuation and rotation of the sensor. The vertical magnetic anomaly was obtained along the trajectory of the balloon by comparison with IGRF. It has a tendency to be positive near the inland and negative over the greater part of the Japan sea. It is noticed that there is a short wavelength magnetic anomaly over the aftershock area of the 1983 Nihonkai-chubu earthquake.
宇宙航空研究開発機構の論文