The magnetic observation was observed using shipboard three–component magnetometer (STCM) as a part of an ongoing geological mapping of the southern region of the Tokara Islands region. In this cruise, we used the data of the STCM for the calculation instead of the cesium magnetometer. We tried to conduct the corrections with the existing data Magnetic Anomaly Map of East Asia (CCOP 3rd). As a result, because the data observed by the STCM was very accurate, and the total magnetic anomaly analyzed by this method was almost the same accurate as the cesium magnetometer, and was free from errors at the intersections that usually appear. Therefore, this correction method could improve to also the observation of cesium magnetometers. In the island arc area, many dipole–type magnetic anomalies were observed. With bathymetrical observation, it suggests active volcanism. On the other hand, the trench side was almost flat magnetically. On the trough side, the significant positive magnetic anomalies were observed. This area has a small knoll, but it is not so distinct, which might reflect large–scale igneous activity beneath the seafloor that is not currently visible on land.
"},{"@language":"ja","@value":"トカラ列島南部海域において，海域地質図作成を目的とした地磁気観測を実施し，三成分磁力計の観測値に基づき全磁力異常図を作成した．全磁力の計算には東・東南アジア磁気異常図改訂版第3版を用いた補正を試みた．フラックスゲート型船上三成分磁力計の観測値が精度よく観測されていたこともあり，曳航型セシウム磁力計と同程度の全磁力値を得ることができた．さらに本手法で解析した結果には，測線交点部のエラーがほぼ存在しなかった．今回試した補正方法はセシウム磁力計の観測等でも応用できると考える．島弧部では多くのダイポール型磁気異常が見られ，地形との関連から活発な火山活動が推測される．一方で海溝側は磁気的に起伏が小さく島弧部ほど顕著ではなかった．また，トラフ側では正の磁気異常の目玉が見られた．地形的には海丘のような地形があるが，さほど明瞭でないことから考えると海底面に現在現れていない海底下の大規模な火成活動を反映している可能性が考えられる．
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