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Wakasa, Sachi*; Ishiyama, Tatsuya*; Hirouchi, Daisuke*; Matta, Nobuhisa*; Fujita, Natsuko; Echigo, Tomoo*
Geomorphology, 468, p.109497_1 - 109497_8, 2025/01
Times Cited Count：0 Percentile：0.00(Geography, Physical)To estimate long-term rates of coastal uplift along the northern Pacific coast of Northeast Japan, we determined the surface exposure ages of marine and fluvial terraces based on terrestrial in situ cosmogenic radionuclide dating of exposed bedrock surfaces. Based on reinterpretation of marine and fluvial terraces, we collected samples from the northern and southern Sanriku coast. The surface exposure ages from 
Be concentrations in quartz calculated from the measured Be/
Be ratios commonly suggest middle to late Pleistocene ages for the marine and fluvial terraces and slow coastal uplift rates at intermediate timescales. The results demonstrate different styles of crustal strain accommodation in the northern Northeast Japan arc above the subducting Pacific plate.
Hirouchi, Daisuke*; Matta, Nobuhisa*; Ishiyama, Tatsuya*; Sugito, Nobuhiko*; Takeshita, Yoshihiro*; Mizutani, Kotaro*; Yasue, Kenichi*; Fujita, Natsuko; Sawa, Sho*; Doke, Ryosuke*; et al.
no journal, ,
no abstracts in English
Hirouchi, Daisuke*; Matta, Nobuhisa*; Ishiyama, Tatsuya*; Yasue, Kenichi*; Sugito, Nobuhiko*; Takeshita, Yoshihiro*; Fujita, Natsuko; Sawa, Sho*; Mizutani, Kotaro*; Taniguchi, Kaoru*
no journal, ,
no abstracts in English
Mizutani, Kotaro*; Hirouchi, Daisuke*; Matta, Nobuhisa*; Ishiyama, Tatsuya*; Sugito, Nobuhiko*; Yasue, Kenichi*; Takeshita, Yoshihiro*; Fujita, Natsuko; Sawa, Sho*; Doke, Ryosuke*; et al.
no journal, ,
no abstracts in English
Makino, Mitsuki*; Yasue, Kenichi*; Hirouchi, Daisuke*; Matta, Nobuhisa*; Fujita, Natsuko; Doke, Ryosuke*; Sato, Yoshiki*; Mizutani, Kotaro*
no journal, ,
The Kamishiro fault is part of the northern section of the Itoigawa-Shizuoka Tectonic Line fault zone, and is an active, east-dipping reverse fault that runs north-south from the southern part of Otari Village, Nagano Prefecture, to the southern part of Lake Kizaki, Omachi City. In this study, we confirmed the displacement of a secondary fault in a pit survey carried out on a terrace surface that was raised by the vertical displacement of the active fault. From the results of observation of the strata and radiocarbon dating, we were able to determine the time of activity. However, because this pit is narrow and shallow, it is not possible to grasp the detailed displacement and deformation associated with multiple activities. It is necessary to conduct trench surveys across the faults confirmed in this study to obtain a detailed understanding of the activity. Furthermore, based on the results of this survey, it is necessary to consider the activity of the main fault from the secondary fault.
Wakasa, Sachi*; Ishiyama, Tatsuya*; Hirouchi, Daisuke*; Matta, Nobuhisa*; Fujita, Natsuko; Echigo, Tomoo*
no journal, ,
no abstracts in English
Be dating of middle-late Pleistocene uplifted marine terraces in northern Pacific coast of Northeastern JapanWakasa, Sachi*; Ishiyama, Tatsuya*; Hirouchi, Daisuke*; Matta, Nobuhisa*; Fujita, Natsuko; Echigo, Tomoo*
no journal, ,
Surface exposure ages of marine and fluvial terraces based on in situ Be dating were determined to estimate formation ages and long-term rates of coastal uplift along the northern Pacific coast of Northeastern Japan. Surface exposure ages from Be concentrations in quartz calculated from the measured Be/Be ratios commonly suggest slow in both sites, whereas steep dip domains on the marine terraces along the northern Sanriku coast may imply localized permanent strain accumulation.
