活断層研究
Online ISSN : 2186-5337
Print ISSN : 0918-1024
糸魚川-静岡構造線断層帯北部,大町~松本北部間の変動地形認定と鉛直平均変位速度解明
澤 祥田力 正好谷口 薫廣内 大助松多 信尚安藤 俊人佐藤 善輝石黒 聡士内田 主税坂上 寛之隈元 崇渡辺 満久鈴木 康弘
著者情報
ジャーナル フリー

2006 年 2006 巻 26 号 p. 121-136

詳細
抄録

We conducted a tectonic geomorphological survey along the northern part of the Itoigawa-Shizuoka Tectonic Line (ISTL) with support from the Ministry of Education, Culture, Sports, Science and Technology of Japan as one of the intensive survey on ISTL fault system. This survey aims to clarify the detailed distribution of the slip rates of this fault system, which provides the essential data set to predict the coseismic behavior and to estimate the strong ground motion simulation. In order to achieve this purpose, the active fault traces are newly mapped along the northern part of the ISTL through interpretations of aerial photographs archived in the 1940s and 1960s at scales of 1: 10,000 and 1: 20,000, respectively. This aerial photo analysis was also supplemented and reinforced by field observations.
One of the remarkable results by using this data set is a large number of, here 84, photogrammetrically measured landform transections to quantify the tectonic deformations. We could calculate vertical slip rates of the faults at 74 points, based on the estimated ages of terraces (H: 120 kyrs, M: 50-100 kyrs, Ll: 10-20 kyrs, L2: 4-7 kyrs, L3: 1-2 kyrs). The vertical slip rates distributed in the northern part of the study area show 0.2-5.5 mm/yr on the L terraces (less than 20 kyrs) and 0.05-0.9 mm/yr on the M and H terraces (more than 50 kyrs). The vertical slip rates of the faults located in the central and southern part of the study area are 0.2-3.1 mm/yr.

著者関連情報
前の記事 次の記事
feedback
Top