Neotectonics along the eastern rim of the Nara Basin, central Japan.

Sangawa, Akira; Kinugasa, Yoshihiro; Okumura, Koji; Yagi, Hiroshi

doi:10.4116/jaqua.24.85

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…Major active thrusts that form conspicuous geomorphic boundaries between ranges and basins or plains in Japan frequently show geological and geomorphic evidence of thrust front migration during the Quaternary toward the downthrown side of the main thrust (e.g., Ota and Sangawa 1982;Yamazaki 1984;Sangawa et al 1985). The migration of the thrust front means that a thrust newly branched off the main thrust with a low angle gradually increases its activity instead of the main thrust.…”

Section: Migration Of the Thrust Front And Landform Evolutionmentioning

confidence: 99%

Recent Progress in Tectonic Geomorphology in Japan, with Special Reference to Active Fault and Related Tectonic Studies

Yamazaki

1996

Geogr. Rev. Jpn, Ser B

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Abstract:Active fault and related tectonic studies in Japan are chronologically reviewed from the viewpoint of tectonic geomorphology.The future prospects are also described based on the trends of recent progress in active fault study and the surrounding social circumstances.Since the publication of Active Faults in Japan in 1980, the field in Japan has roughly been split into two domains: the reconstruction of detailed fault behavior in Holocene times; and the elucida tion of the relationship between active faults and regional tectonics. The former describes various kinds of fault behavior through the application of the trench excavation method. Although the historical activity has been uncovered on many active faults, the surveys have become increasingly difficult due to the artificial modification of land. New proposed methods such as drilling, however, have not yet developed sufficiently to substitute for trenching. The latter domain discusses various topics related to the characteristics of long-term tectonic behavior from the viewpoint of landform evolution. Studies on the net slip-rate of thrust faults and the migration of thrust fronts have brought new knowledge and ideas to landform geomorphology and seismotectonic research. The morphotectonic and seismotectonic studies in offshore and onshore regions along the Nankai Trough have sufficiently explained the tectonic and landform evolution on the island arc scale in Southwest Japan. Based on present conditions, the author proposes the following directions which should promote progress in active fault study and to utilize the results for hazard mitigation in the future: (1) to distinguish the segmentation structure in the active fault system; (2) to establish seismotectonics models for various regions in Japan; and (3) reconsideration of the recurrence interval of large earthquakes.

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Section: Migration Of the Thrust Front And Landform Evolutionmentioning

confidence: 99%

Recent Progress in Tectonic Geomorphology in Japan, with Special Reference to Active Fault and Related Tectonic Studies

Yamazaki

1996

Geogr. Rev. Jpn, Ser B

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“…The thickness of the basin fills generally increases toward the boundary fault to form a sedimentary wedge. In many cases, boundary faults are not active; instead, active faults or flexures (referred to as "frontal faults/flexures") develop several km in front of the boundary faults (IKEDA and YONEKURA, 1979;SAWA, 1981;OTA and SANGAWA, 1982;IKEDA,1983;SANGAWA et al,1985;WATANABE, 1985;SUZUKI, 1988). On the upthrown side of a frontal fault/flexure, basin fills are strongly deformed and eroded to form foothills.…”

Section: Precise Mapping Of Active Faultsmentioning

confidence: 99%

Active Faults and Neotectonics in Japan.

Okada

Ikeda

1991

Daiyonki-kenkyu

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Faults and Neotectonics in Japan1) Atsumasa OKADA2) and Yasutaka IKEDA3) We review in this paper the recent trend of active fault studies in Japan. The Japanese Islands, including the continental shelves and slopes surrounding them, form an active tectonic belt. The overall distribution and regional characteristics of Quaternary faults have recently been clarified, and are now being supplemented in detail. Some topics, including the studies of active faults on shallow sea and lake bottoms, the geomorphic and structural evolution of and the surface defromation associated with thrust faults, and the excavation of active faults with or without historic activity, are also reviewed.

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