地震予知研究計画によるプロトン磁力計の製作とその試験

概要

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A 5-year plan for earthquake prediction research has been under way in Japan since 1965. Among a number of objects of the plan, it has been decided to conduct accurate observations of the geomagnetic secular variation by a proton precession magnetometer network covering Japan Islands as a part of the geomagnetic project. Some of the magnetometers are planned so as to work as gradiometers which are able to observe difference in the total field intensity between two stations a few kilometers distant from one another. What is described in this report is an outline of the magnetometer and the device for making differences.
1967-01-30