@article{oai:u-fukui.repo.nii.ac.jp:00027069,
 author = {中島, 正志 and 藤井, 純子 and 山本, 博文 and 土田, 浩司 and NAKAJIMA, Tadashi and FUJII, Junko and YAMAMOTO, Hirofumi and TSUCHIDA, Koji},
 journal = {福井大学教育地域科学部紀要 第II部 自然科学 (地学編)},
 month = {Dec},
 note = {Paleomagnetic measurements were made on the Kikai-Akahoya tephra(K-Ah)and the Ikegahara sediment( IK)of the Katsuyama Area, Fukui Prefecture. The stable component of remanent magnetization was isolated from the samples at 5 sites of K-Ah and at 12 horizons of IK through stepwise alternating field demagnetization up to 30 mT. The site-mean directions of K-Ah are almost identical with one another. Magnetic minerals in the K-Ah samples are chiefly titanomagnetite or magnetite, which are considered to be not secondary minerals, based on experimental results of stepwise IRM acquisition and thermal demagnetization of a three-component IRM. These facts indicate that their magnetic directions were acquired under the geomagnetic field at the eruption time of K-Ah. Horizon-mean magnetic directions from IK continuously change against depth with amplitude of about 15°. The change likely originated from ancient geomagnetic secular variation. The paleomagnetic direction of the uppermost horizon of IK, which contains volcanic glass shards derived from K-Ah, is consistent with the directions obtained from K-Ah. This suggests that the formation of the horizon was nearly simultaneous with the eruption of K-Ah.},
 pages = {1--15},
 title = {鬼界アカホヤテフラと福井県勝山市の池ヶ原堆積物の古地磁気研究},
 volume = {56},
 year = {2004}
}