Geomagnetic anomalies over the Japanese islands region derived from MAGSAT data

Scalar and vector geomagnetic anomaly maps over the Japanese islands region were derived from MAGSAT Investigator-B tape data. All the available data were classified into four subsets to examine the common appearance of the same anomaly pattern in the geomagnetic maps. These maps revealed that the anomaly patterns with wavelength longer than about 500 km appeared commonly in all maps, so that these long-wavelength geomagnetic anomalies are certainly caused by crustal source. (author)