表面波探査による松代室野地区の泥火山の浅部Ｓ波速度構造調査

DOI NDLデジタルコレクション Web Site 被引用文献6件 参考文献53件 オープンアクセス

書誌事項

タイトル別名
  • Investigation of Subsurface S-wave Velocity Structures beneath a Mud Volcano in the Matsudai-Murono District by Surface Wave Method
  • ヒョウメンハ タンサ ニ ヨル マツダイムロノ チク ノ デイカザン ノ センブ Sハ ソクド コウゾウ チョウサ
公開日
2009
DOI
  • 10.5026/jgeography.118.390
公開者
公益社団法人 東京地学協会

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説明

We investigated the geological structure below the Matsudai-Murono mud volcano, Tokamachi city, Niigata prefecture, Japan, using vertical distributions of S-wave velocities, estimated from surface wave inversion. From the surface to a depth of several meters, the S-wave velocity first increases, then decreases, and finally increases again. Below a depth of 10 m, there are two areas with high and low velocities in the horizontal direction. We found that the subsurface low-velocity layer is a mud layer produced by an eruption, and the deep low-velocity zone is a mudstone zone, some parts of which are transformed into soft clay by muddy water that drifts upward. The planar distribution of the S-wave velocity indicates that the deep low-velocity zone may be subdivided. The zone in which the velocity is particularly high corresponds to the area without surface uplift indicated by GPS; hence, this area is not influenced by the mud volcano. This study shows that it is possible to conduct subsurface geophysical investigations to clarify the eruption mechanism of the mud volcano.

収録刊行物

  • 地学雑誌

    地学雑誌 118 (3), 390-407, 2009

    公益社団法人 東京地学協会

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