Geomagnetic anomaly pattern of the Japan Sea |
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| Authors: | Nobuhiro Isezaki Seiya Uyeda |
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| Institution: | (1) Earthquake Research Institute, The University of Tokyo, Tokyo, Japan;(2) Meteorological College, Kashiwa, Chiba-Pref., Japan |
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| Abstract: | Using all available geomagnetic data, including those obtained in a detailed survey conducted by the authors in 1970, the geomagnetic anomaly pattern if the Japan Sea has been studied. It has been established that sublinear magnetic anomalies run subparallel to the general trend of the Japanese Islands. The peak to peak amplitudes of most of these anomalies are less than 300y, their wavelengths 20 to 40 km. The anomalies are much less distinct in linearity than those found in the northwestern corner of the Pacific basin off northeastern Honshu. The linear trend is better developed in the deeper basin areas and less recognizable in the Yamato- and Kitayamato-areas. The anomaly pattern appears to support the view that the Japan Sea floor evolved through a spreading process from numerous spreading centers. A definite conclusion about the genesis of the Japan Sea, however, must await further investigation. |
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