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Miyasaka, Seigo*; Niizato, Tadafumi; Shigeno, Kiyoyuki*
Hokkaido No Jisuberi, 2012, p.61 - 66, 2012/08
no abstracts in English
Niizato, Tadafumi; Shigeno, Kiyoyuki*; Takashimizu, Yasuhiro*
Rekishi Jishin, (21), p.121 - 136, 2006/00
In this paper, Ainu oral traditions and historical records on earthquake events in the Ainu Cultural period were investigated, and the reliability of occurrence of the past earthquake events happened in Hokkaido was examined. As a result of investigation, 28 oral traditions and historical records were collected from the Ainu-related literatures. Based on the examination, we interpreted 24 traditions and records as results of ancient earthquakes, and the others were not related to earthquakes. The inferred areas hit by earthquakes in the Ainu Cultural and its before period were mainly distributed around the Pacific coastal area of Hokkaido. It may be presumed that future distribution of earthquake will be same as present-day distribution for a same future period of Ainu Cultural period on the basis of distribution of the past to present earthquake.
Niizato, Tadafumi; Shigeno, Kiyoyuki*; Takashimizu, Yasuhiro*
no journal, ,
Ainu oral traditions and historical records on earthquake events in the Ainu Cultural period were investigated, and the reliability of occurrence of the past earthquake events in Hokkaido was examined. As a result of investigation, 28 oral traditions and historical records were collected from the Ainu-related literatures. Based on the examination, we interpreted 24 traditions and records as results of past earthquakes, and the others were not related to earthquakes. It is inferred that earthquake hit Hokkaido were mainly distributed around the Pacific coastal area during the Ainu Cultural period and the previous period. Those areas are adjacent to the seismically active area at present in and around Hokkaido. On estimating of probability of future seismicity by extrapolation of the past to present seismicity, it may be presumed that future distribution of earthquake will be same as that of present-day earthquake in the same future period of Ainu Cultural period.
Niizato, Tadafumi; Yasue, Kenichi; Shigeno, Kiyoyuki*; Miyasaka, Shogo*
no journal, ,
The landform in the Hokushin district, Horonobe, northern Hokkaido is developing under the influence of the "rock-control" based on the difference of drainage pattern, relief energy, drainage density, and distribution of landslide in each formation.
Kitazawa, Toshiyuki*; Shigeno, Kiyoyuki*; Koitabashi, Shigekazu*; Miyasaka, Shogo*; Niizato, Tadafumi; Hoyanagi, Koichi*
no journal, ,
Based on the sedimentary facies and sequence stratigraphical analysis, we can estimate the role of wave and flood in the formation of a tiny delta in the coarstal zone of the Horonobe area during the depositional period of the lower Sarabetsu Formation.
Kitazawa, Toshiyuki; Shigeno, Kiyoyuki*; Koitabashi, Shigekazu*; Miyasaka, Seigo*; Niizato, Tadafumi; Hoyanagi, Koichi*
no journal, ,
no abstracts in English
Kitazawa, Toshiyuki; Shigeno, Kiyoyuki*; Koitabashi, Shigekazu*; Miyasaka, Seigo*; Niizato, Tadafumi; Hoyanagi, Koichi*
no journal, ,
no abstracts in English
Niizato, Tadafumi; Shigeno, Kiyoyuki*; Miyasaka, Shogo*; Koitabashi, Shigekazu*
no journal, ,
A critical issue to assess the long-term safety of geological disposal system is to demonstrate the stability of the geosphere, taking into account its likely future evolution over geological time. In this study, we have constructed the conceptual models for geomorphic evolution in the Horonobe area, Hokkaido, northern Japan based on the results of air-photographic interpretation, topographic and geological surveys, age-determination of landforms and sedimentary formations, and pollen analysis. The landforms in the area have been evolving under the control of not only a climate as external factor but also surface geology which the landform had developed.
Shigeno, Kiyoyuki*; Nakanishi, Toshimichi; Hong, W.*; Nanayama, Futoshi*
no journal, ,
To estimate the sedimentary process of chronological samples in tsunami deposits, the radiocarbon ages of 10 pairs of marine shells and terrestrial plants were measured from one core obtained of lagoon lake sediments from the Lake Harutori in Kushiro City, eastern Hokkaido. This core of 12.6 meters length was obtained in the central part of the frozen lake in winter, which locates on a tectonic active region in the southwestern Kuril arc associated by the oblique subduction of the Pacific Plate under the Okhotsk. The radiocarbon ages from the tsunami deposits were more than 1000-4000 years older than the depositional curve constructed by previous radiocarbon ages and tephrochronology. It clearly suggests that these materials were reworked from older sediments by catastrophic tsunamis.
