29. Report on Geomagnetic Survey in the Northwestern Pacific during JEDS-VI, JEDS-VII and JEDS-VIII Cruises

概要

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Geomagnetic total force was measured by a towed proton precession magnetometer in the north-western Pacific(142°E-160°E,40°N-44°N) during the cruises of M/S "Ryofu Maru" and M/S "Takuyo" in JEDS(Japanese Expedion of Deep Seas) VI, VII(1963) and VIII(1964). Together with the data obtained in a previous cruise in JEDS IV(1961) and the data by "Spencer F. Baird" of the Scripps Institution of Oceanography during the Japanyon Expedition(1961), a magnetic total force distribution chart in the area is tentatively obtained. Subtracting the regional trend, an anomaly chart is also drawn. The charts indicate that there are anomaly lineations in the NEE-SWW direction with an amplitude of several hundred gammas. The lineations are of a width of about 30km, and are not apparently associated with the bottom topography. Four sea mounts were surveyed somewhat closely and the anomalies associated with them mapped.表記航海において,気象庁観測船"凌風丸",および水路部観測船"拓洋"に便乗し,プロトン磁力計によつて地磁気全磁力の測量を行なつた．海域は主として,142°E-160゜E,40°N-44°Nであり,従来の結果,および,Scripps海洋研究所観測船"Baird"号による結果をまとめて,全磁力分布図を得た.また,地域全休の分布を観測値からさし引くことによって,局地異常図もつくられた.
1964-12-25