著者
中井 順二 駒沢 正夫 大久保 泰邦
出版者
Tokyo Geographical Society
雑誌
地学雑誌 (ISSN:0022135X)
巻号頁・発行日
vol.96, no.4, pp.185-200, 1987-08-25 (Released:2009-11-12)
参考文献数
15
被引用文献数
2 2

Bouguer anomaly map of the Kanto district was compiled. On the whole, gravity anomalies are high in Tsukubasan areas, and low in the central parts of the Kanto plain. Negative anomalies in the Boso peninsula and the Tama hills suggest the basement structures of the sedimentary basins. The Kanto mountains district is bounded on the east by steep gradient of gravity anomaly. The above gravity features can be recognized in the map of the upward continuation. The gravity trend along Narashino, Sakura and Omigawa is more clearly indicated in the map of the first derivative, and the tectonic line covered by sediments can be supposed.In the Izu peninsula and the Tanzawa mountains district, gravity anomalies are rather high and low anomaly zone is recognized between these two areas. The northern border part of this zone correspond to Kannawa fault and Kozu-Matuda fault.Aeromagnetic map was compiled with the data obtained by New Energy Development Organization and Geological Survey of Japan.Generally, the Kanto district is surrounded by intense magnetic anomalies with short wavelength which are distributed along Nasu volcanic zone and Fuji volcanic zone.In the central part of the Kanto plain, weak magnetic anomalies are scattered zonally in the E-W direction. According to the geological and well data, this zone seems to be corresponded to Sambagawa metamorphic belt and these anomalies are presumably caused by the basic or ultrabasic rocks.The Hakone mountains district has sharp anomalies with short wavelengths, and the maximum amplitude of the anomalies reachs 900nT. Low anomaly zones are recognized arround this high anomalies. The source of this low anomalies is not clear, but it is of great interest geologically and geophysically.

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教えて!goo (1 users, 1 posts)

> ゼロ磁場とは、力(磁力)が一緒で、向き(S極向き、N極向き)が違う磁気が同時に存在し、互いに均衡を保っているため磁束密度を測定すると、0か著しく低い値になっている場所と解釈しています。  このため、方位磁石を置いても方位磁石が定まらない状態と聞きます。 ★ そういう理解の仕方もあると思います。 ただ、そうではない理解の仕方もあると思います。 磁力の向きを水平方向しか考えないのではなくて垂 ...

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関東の高重力地域 ・筑波山-日立地域(筑波山頂150mgal) ・宇都宮周辺地域(95mgal) ・房総半島南部(野島崎100mgal) ・伊豆半島南部 逆に低重力の地域も点在する 【PDF】https://t.co/l0N6Yg80zK

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