UTokyo Repository 東京大学

UTokyo Repository >
131 地震研究所 >
東京大学地震研究所彙報 >

このページ(論文)をリンクする場合は次のURLを使用してください: http://hdl.handle.net/2261/13261

タイトル: Spatial Dependence of Short-period Geomagnetic Fluctuations on Oshima Island (1).
その他のタイトル: 伊豆大島に於ける地磁気短周期変化の異常(1)
著者: Sasai, Yoichi
著者(別言語): 笹井, 洋一
発行日: 1967年6月15日
出版者: 東京大学地震研究所
掲載誌情報: 東京大学地震研究所彙報. 第45冊第1号, 1967.6.15, pp. 137-157
抄録: Simultaneous observations with three portable magnetometers are made at a number of stations on Oshima Island, a volcanic island about 100km south of Tokyo. The observations bring to light remarkable differences in short-period Z variation between various stations on such a small island, approximately 10 km in diameter. Z variations having a period of 30min. or so show a complete reversal of sign between the north and south sides of the island, while no marked differences are found for slower variations such as Sq. Such an anomaly seems to be caused by electric currents induced in the surrounding sea-water by changes in the geomagnetic field of external origin. Statistical as well as spectral analyses are made on the available data obtained along the N-S profile. Even if the anomalous part due to the sea-water effect is removed on a simple assumption, it seems likely that there still remains a substantial enhancement of the Z variations of short period. It is therefore concluded that Oshima Island belongs to the anomalous area of the "Central Japan Anomaly" which has been well-established by nation-wide observations in the past.
URI: http://hdl.handle.net/2261/13261
ISSN: 00408972


ファイル 記述 サイズフォーマット
ji0451009.pdf1.13 MBAdobe PDF見る/開く



Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - ご意見をお寄せください