Proceedings of the General Meeting of the Association of Japanese Geographers
Annual Meeting of the Association of Japanese Geographers, Spring 2014
Session ID : 610
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Abstract
Repeated rock avalanche runout from the upper Okumatashirodani Basin, Kamikochi Valley, northern Japanese Alps
*Yoshihiko KariyaYuki MatsushiSatoru HarayamaHiroyuki Matsuzaki
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Abstract
In and around the Shinmurabashi Bridge in Kamikochi Valley of northern Japanese Alps, debris hummocks and a minor ridge features both 10 m high and with angular gravels are developed on the alluvial fan along Benten-sawa River and Okumatashiro-dani River, respectively.  These landforms are not moraines but rock avalanche origin supplied from the east face of Maehotakadake North Ridge about 2500-3000 m ASL.  Terrestrial cosmogenic nuclide chronology reveals that these features were formed in the period during 6.0-7.9 ka (hummocks) and 0.8-1.1 ka (minor ridge).
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© 2014 The Association of Japanese Geographers
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