2024-03-29T06:44:26Z
https://repository.dl.itc.u-tokyo.ac.jp/oai
oai:repository.dl.itc.u-tokyo.ac.jp:00032840
2022-12-19T04:08:46Z
80:4535:4757:4758
9:504:4538:4759:4760
Gravity Observations along the Itoigawa-Shizuoka Geotectonic Line (II) : Bouguer Anomaly in the Suwa Basin, Nagano Prefecture, Central Japan
糸魚川-静岡構造線の重力調査(III) : 諏訪湖周辺部のブーゲー異常
萩原, 幸男
127962
村田, 一郎
127963
長沢, 工
127964
井筒屋, 貞勝
127965
小竹, 美子
127966
大久保, 修平
127967
田島, 廣一
127968
453
application/pdf
諏訪湖周辺に約400点の重力測定を実施した.諏訪湖は糸魚川-静岡構造線の12kmにおよぶ左横ずれ断層運動により生じた陥没地形であって,陥没量は800mを越える.ブーゲー異常から推定すると,陥没量は1~1.4km,横ずれ量は明確ではないが15~20kmと見積ることができる.
The Suwa basin is located in the middle part of the Itoigawa-Shizuoka geotectonic line, the left-lateral displacement of which is estimated as about 12 km from geological evidence. The vertical displacement of the basin subsidence amounts to about 800 m. Another important geotectonic line called the Median tectonic line intersects the Itoigawa-Shizuoka line near the Suwa basin. We define gravity field disturbances associated with these faulting activities in considerable detail by concentrating gravity surveying points on the Suwa basin. We clarify gravimetrically the structure around the intersection of the two tectonic lines. Analysis of Bouguer anomaly indicates that the basin subsidence may exceed 1000 m and the lateral offset amounts to 15~20 km, though the latter is not necessarily clear.
departmental bulletin paper
東京大学地震研究所
1988-03-31
application/pdf
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
4
62
517
534
AN00162258
00408972
https://repository.dl.itc.u-tokyo.ac.jp/record/32840/files/ji0624010.pdf
jpn