大気球による三陸沖および日本海溝周域の磁気異常の観測

概要

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The high level balloons (fleight level is 20Km-28km) were flown on May 29 1975,May 20 1977 and Sep. 23 1983 in order to observe the magnetic anomaly of total force with proton preccession magnetometer over the area of the west pacific ocean (offshore Sanriku district) and the visinity of Japan Trench. After comparing the data of magnetic surveys of total force on the sea level observed by Goelogical Survey Institute and Deffense Mapping Agency Hydrographic Center, we can clarify the underground magnetic structure of the area of Japan Trench and the magnetic anomalies due to the subduction of the pacific ocean plate, the accretion of the plate near the west break of the plate. The intense magnetic anomaly was also observed at the center of the seismic front of northeastern Japan and this may be caused by the igneous activity and the piezomagnetic effect excited by the movement of subduction.
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