Doctor of Science

1987, Osaka City University, Graduate School,Division of Natural Science

1979, Shinshu University, Faculty of Science

Active Fault in the Itoigawa-Shizuoka fault zone discovered at Lake Midoriko in Shiojiri City, Nagano Prefecture, Central Japan.
下田力, 大塚勉
環境科学年報, (45), 17-24, Mar. 2023

Database of surface ruptures occurred in the 2014 Kamishiro fault earthquake, Nagano prefecture, central Japan.
大塚勉, 下田力
環境科学年報, (45), 32-52, Mar. 2023

Geology and Early Pleistocene flat surface in the southeastern part of the Ina Valley, Nagano Prefecture, Central Japan.
Ryuhei Matsushima and Tsutomu Otsuka
環境科学年報, (44), 30-40, Mar. 2022, Refereed

Geological Structures at the Boundary of Middle and Southern Sections of the Itoigawa- Shizuoka Tectonic Line in Hakushu Area
Shun Kawana & Tsutomu Otsuka
環境科学年報, (44), 13-29, Mar. 2022

Udukiyama Fault in the Ina Mountains, Nagano Prefecture, Central Japan.
松島竜平, 大塚勉
環境科学年報, (43), 57-65, Mar. 2021

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