Studies on the Bouguer anomaly of active faults along the western margin of the Kanto plain

关东平原西缘活动断裂布格异常研究

• 批准号: 61540286
• 负责人: HAGIWARA Yukio
• 金额: $ 1.02万
• 依托单位: Earthquake Research Institute, University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61540286/
• 关键词: active fault; gravity observation; Bouguer anomaly; left-lateral; strike-slip; 縦ずれ断層; ブーゲー異常; 越生-高麗本郷断層; 立川断層; 名栗断層; 重力異常; 1931年西埼玉地震; 震源断層

Gravity observations were made at about 1,500 stations with a LaCoste and Romberg gravimeter over an area of about 1,700 km_2 in the western part of the Tokyo metropolisphere for the purpose of clarifying fault structure there. Our conclusion is as follows:(1) The Kodama fault (newly discovered by the present survey), the Kushibiki fault and the Kasukawa fault stand continuously in a single fault-line. The 1931 Nishi-Saitama earthquake may have been caused by a joint motion of these faults.(2) From the topographical point of view the Tachikawa fault is considered to be a vertical fault subsiding southwestward the present gravity survey concludes, however, that this fault may possibly be a left-lateral strike-slip fault including vertical displacements.

在东京都西部约1,700平方公里的范围内，用LaCoste和Romberg重力仪在约1,500个测站进行了重力观测，以弄清那里的断层结构。结果表明：（1）本次调查新发现的儿玉断层、串比木断层和春日川断层为一条连续的断层线。1931年的西琦玉地震可能是由这些断层的联合运动引起的。(2)从地形学的观点来看，立川断层被认为是一个向西南方向沉降的垂直断层，然而，目前的重力测量得出的结论是，该断层可能是一个左旋走滑断层，包括垂直位移。

项目成果

萩原幸男,村田一郎,田島広一,長沢工,井筒屋貞勝,大久保修平: 地震研究所彙報. 61. 563-586 (1986)

Yukio Hagiwara、Ichiro Murata、Koichi Tajima、Takumi Nagasawa、Sadakatsu Izutsuya、Shuhei Okubo：地震研究所公报 61. 563-586 (1986)。

Hagiwara,Y.;Nagasawa,K.;Izutuya,S.;Kotake,Y.; Okubo,S.: "Gravity study of active faults (3) - Ogose-Komahongo fault and the northern part of Tachikawa fault -" Bulletin of Earthquake Research Institute. 63. 33-50 (1988)

萩原，Y.；长泽，K.；伊豆谷，S.；小竹，Y.；

萩原幸男 他: 地震研究所彙報. 63. 115-129 (1988)

Yukio Hagiwara 等人：地震研究所公告 63. 115-129 (1988)

萩原幸男: 地震研究所彙報. 61. (1986)

萩原幸男：地震研究所公报 61。（1986）

萩原幸男 他: 地震研究所彙報. 61. 563-586 (1986)

Yukio Hagiwara 等人：地震研究所公报 61. 563-586 (1986)