文献史料に基づく,岩手火山における江戸時代の噴火活動史

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書誌事項

タイトル別名
  • The Eruption History of Iwate Volcano in the Edo Period, based on the Historical Documents
  • ブンケン シリョウ ニ モトズク イワテ カザン ニ オケル エド ジダイ ノ フンカ カツドウシ

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説明

It has been regarded that the eruption activity had been generated at the Iwate volcano in AD 1683, 1686- 89, 1719, 1730 and 1732. In this study, the eruption history of Iwate volcano in the Edo period is reexamined by judging the credibility of historical records of eruption. The following conclusions were obtained from my investigation, a) The mistake is found in the description of the age in the historical document which has been regarded as the evidence of the 1683 eruption, b) According to a letter of the previous lord of Morioka clan and the reports of government authorities, a violent eruption began with eruptive-column forming above central crater of the stratovolcano on March 26 AD 1686, and became quiet in the early morning of 27th. The pyroclastic deposit discharged by this eruption is the Kariya scoria with the distribution axis from the central crater in northeast and the southeast foot. The volcanic hazard by this event was caused due to the lahar which occurred because of the melt of the snow of the mountain. Human damage did not occur though several houses were swept away by lahars. c) The credibility of the historical documents assumed for the 1686 eruption which continued even in AD 1687 and AD 1689 is weak. In fact, the eruption started in AD 1686 was ended within the year, d) The credibility of historical documents which describe the 1719 and 1730 eruption is also extremely weak, f) The 1732 eruption was recorded in the administrative report of Morioka clan. This historical documents describe the effusion of lava-flow from the northeastern foot of the Iwate volcano. It is assumed that this report corresponds to Yakehashiri lava flow. The lava effusing started at midnight of January 21 and continued for 7-10 days. The inhabitant who resided in the the foot of the mountain was evacuated from the village due to frequent volcanic earthquake. The human and material damage did not occur in this eruption.

収録刊行物

  • 火山

    火山 43 (6), 467-481, 1998

    特定非営利活動法人 日本火山学会

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