{"id":42508,"date":"2023-12-11T05:27:39","date_gmt":"2023-12-10T20:27:39","guid":{"rendered":"http:\/\/kochihen.replan.ne.jp\/?p=42508"},"modified":"2023-12-14T21:17:34","modified_gmt":"2023-12-14T12:17:34","slug":"%e3%80%90%e5%8c%97%e6%96%b9%e6%97%a5%e6%9c%ac%e3%81%ae%e5%a4%89%e5%8b%95%e8%a6%81%e5%9b%a0%e3%81%a8%e3%81%97%e3%81%a6%e3%81%ae%e7%81%ab%e5%b1%b1%e5%99%b4%e7%81%ab-%e6%9c%ad%e5%b9%8c%e3%80%8c%e6%93%a6","status":"publish","type":"post","link":"http:\/\/kochihen.replan.ne.jp\/?p=42508","title":{"rendered":"\u3010\u5317\u65b9\u65e5\u672c\u306e\u5909\u52d5\u8981\u56e0\u3068\u3057\u3066\u306e\u706b\u5c71\u5674\u706b \u672d\u5e4c\u300c\u64e6\u6587\u300d\u907a\u8de1\u63a2\u8a2a-6\u3011"},"content":{"rendered":"

\"\"<\/a>
\n\"\"<\/a>
\n\"\"<\/a>
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\n\"\"<\/a>
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English version\u2b07<\/p>\n

Volcanic Eruption as a Variable Factor in Northern Japan: Exploration of the Sapporo “Abrasive Text” Site – 6
\nVolcanic eruptions of Mt. Hakutou and Towada, a factor of change for which there are no written records in Japan or Korea, China. What is the impact on hunter-gatherer societies? ……<\/p>\n

Two “variables” that are rarely mentioned in Japanese history or ancient Korean and Chinese history books are the caldera-level eruption of Towada volcano in 915 and the volcanic eruption of Mount Paektu in 946.
\nTowada is mentioned in a privately compiled history book of the Heian period called Fuso Bunki, which is said to have been compiled by Koen, a priest of Koutokuin Temple on Mount Hiei, during the reign of Emperor Horikawa after 1094. Even at that time, it was 180 years in the “past”. In Japan, Buddhist temples and other records served as media and historical records.
\nThe Towada eruption left clear traces in the surrounding strata, and geological evidence of the damage has recently been confirmed. In the Akita Prefecture area, it is clear that a pyroclastic flow swallowed a dwelling built with timber from the 912 eruption. Considering the scale of the damage, it can be estimated that it would have had a considerable impact on the historical development of the ancient Northeast region.<\/p>\n

The eruption of Mt. Paektu, on the other hand, is said to have had a stronger impact on the Hokkaido region.
\nAlthough geologically dated as a very “recent” volcanic eruption on a global scale, there are almost no records of its occurrence in Japan, China, or Korea. However, as shown in the figure above, there are clear stratigraphic records of volcanic ash fall. Unfortunately, there are no clear written records, especially for the Aburibun period on Hokkaido Island, but it must have been a major factor in the fluctuation of the island. The eruptive sedimentary layer has been identified as an extremely rare stratum in Tomakomai.
\nIt is clear that we, as an agricultural culture, do not have a clear imagination about the impact of such a change on the economic structure of hunter-gatherers.
\nThe westerly winds coming across the “warm sea” of the Sea of Japan have made the northern part of the Japanese archipelago one of the snowiest regions in the world. Aomori and Sapporo rank first and second in the world in terms of cities. Perhaps Hokkaido’s northeastern region is unique in its climatic conditions of snow cover and cold temperatures.
\nThese conditions are not often recognized.
\nIn addition to these regional characteristics, the largest eruptive ash fall since the beginning of history hit the Abravaean society far across the Sea of Japan. Guided by geological and archaeological findings, we would like to excavate the lives of people in the past and discover the “wisdom” of their survival.
\nWe in Hokkaido are under tremendous pressure from environmental factors as a factor in housing. However, I would like to think positively that being an advanced area in terms of challenges will also be the greatest incentive for technological development to overcome such challenges.<\/p>\n","protected":false},"excerpt":{"rendered":"

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