Emerged Abrasion Platforms on Enoshima Island, Kanagawa Prefecture and Uplift Associated with the 1703 Genroku Kanto Earthquake

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  • MATSUDA Tokihiko
    Earthquake Research Center, Association for the Development of the Earthquake Prediction
  • S. MATSU'URA Ritsuko
    Earthquake Research Center, Association for the Development of the Earthquake Prediction
  • MIZUMOTO Tadaki
    Earthquake Research Center, Association for the Development of the Earthquake Prediction
  • TAJIKARA Masayoshi
    Earthquake Research Center, Association for the Development of the Earthquake Prediction

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Other Title
  • 神奈川県江の島の離水波食棚と1703年元禄関東地震時の隆起量
  • カナガワケン エノシマ ノ リスイ ハショクダナ ト 1703ネン ゲンロク カントウ ジシンジ ノ リュウキリョウ

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Description

 There are two emerged abrasion platforms on Enoshima Island, Kanagawa Prefecture, Southern Kanto district: the 4.0-meter-high Ryoshimachi surface, and the 1.0–1.3-meter-high Iwaya surface. Both emerged prior to the 1703 Genroku Earthquake. Considering uplift due to the 1923 Taisho Kanto Earthquake and non-seismic subsidence since the Genroku Era, uplift due to the 1703 Genroku Earthquake was 0.7 m or less, assuming that the height of Ryoshimachi surface before the Genroku Earthquake was 3 m or higher. This indicates that uplift of the Genroku Earthquake at Enoshima was smaller than that of the Taisho Earthquake, and the focal regions of the two earthquakes were different in the Sagami Bay. These two earthquakes are not repeating earthquakes at the Sagami Bay area.

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