Evaluation of landslide activity using remanent magnetization measurement

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  • 残留磁気測定を用いた地すべり変動の評価
  • ザンリュウ ジキ ソクテイ オ モチイタ ジスベリ ヘンドウ ノ ヒョウカ

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<p>  Magnetic minerals, such as iron, are contained in natural materials like rocks or sediments. These minerals possess the property of acquiring magnetization that corresponds to the prevalent geomagnetism at the time of their formation.</p><p>  After acquisition, the magnetization is preserved for a few million years as remanent magnetization, which can provide us with an index related to the direction and inclination of the magnetic north. We can thus discuss whether the materials at a certain place were displaced due to a landslide or a bedrock collapse in the past.</p><p>  In this study, we measured remanent magnetization and mineral composition and age of the Quaternary volcanic products around the Gassan Shizu landslide area for the purpose of elucidating the landslide process of movement and spectrum.</p><p>  The analysis results have become indexes of risk assessment and countermeasure-planning of the Gassan-Shizu landslide.</p>

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