1 0 0 0 選択的静脈サンプリング検査が有用だった甲状腺内副甲状腺腫の一例
1 0 0 0 OA 岩手県雫石盆地北-西縁部の地質と活断層群の垂直変位量
- 著者
- 土井 宣夫 越谷 信 本間 健一郎
- 出版者
- 一般社団法人 日本活断層学会
- 雑誌
- 活断層研究 (ISSN:09181024)
- 巻号頁・発行日
- vol.1998, no.17, pp.31-42, 1998-12-29 (Released:2012-11-13)
- 参考文献数
- 40
The geology at the northern and western margin of the Shizukuishi basin is composed of upper Miocene Yamatsuda Formation, Pliocene Masuzawa Formation, Plio-Pleistocene Tamagawa Welded Tuffs and units from Takakura and Iwate volcanoes, in ascending order. The geological structure of the margin is characterized by the Nishine fault system, which displaces these formations and units. The fault system, a set of west-dipping reverse faults, forms the topographic and geologic boundary between the Ou Backbone Range and the Shizukuishi basin, and it controls the vertical position of underlying units as well as Takakura and Iwate volcanic products. The vertical displacement of the Shibutami Welded Tuff, which is included in the Tamagawa Welded Tuffs and erupted between 0.7and 1.0 Ma, decreases to the north and south from an area where the tuff has been vertically offset some 300-400 m, for an average displacement of about 0.4 mm/yr. Slip occurred on the northern part of the fault system during the Iwate-ken Nairiku-hokubu earthquake of September 3,1998. The tuff is also displaced at least 250 m along the Matsuo fault for an average displacement of about 0.25mm/yr at the north of the Nishine fault system. This reverse fault strikes nearly parallel to the Nishine fault system and can be traced for 5 km.