On the magnetic change accompanying the Niigata Earthquake.
Local changes in the earth’s magnetic field accompanying the Niigata Earthquake were studied in this paper. Shipborne magnetic surveys were carried out respectively before and after the Niigata Earthquake on the sea area near Awashima Island off the coast of Niigata prefecture, including an epicenter of the earthquake in 1964. Total magnetic intensity was observed to the accuracy of 士10 gammas using a towed proton precession magnetometer onboard the survey ship “Takuyo” belonging to the Hydro graphic office of Japan. From the results of the surveys, it has been found that total intensity of the earth’s magnetic field shows a distinct local change of about several tens of gammas caused by the Niigata Earthquake. This change may be explained by considering that at the time of the earthquake the change in the stress within the earth’s crust produced the change in the earth's magnetism.
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| Format: | Journal Contribution biblioteca |
| Language: | Japanese |
| Published: |
1966
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| Online Access: | http://hdl.handle.net/1834/16394 |
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