The pressure sources beneath Unzen Volcano inferred from geodesic data

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  • 測地学データから推定された雲仙岳下における圧力源
  • ソクチガク データ カラ スイテイ サレタ ウンゼンダケ カ ニ オケル アツリョク ゲン

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Abstract

We inferred the pressure sources under Unzen Volcano on Shimabara Peninsula, which erupted during 1990-1995 by using ground deformation data. It has been proposed that there are three pressure sources associated with the1 990-1995 activity beneath Unzen Volcano. But this model can not explain the ground deformation that was observed after the eruption stopped in 1995, because the upheaval was observed in the southwestern part of Shimabara Peninsula. We used 1991-2001 leveling data for searching. And we recalculated the source's parameters (horizontal location, depth, and volume change) by fitting. We modeled using Mogi Model. It was one of the most different points from previous studies that we modeled pressure sources considering the altitude of each observation station. As a result, we could explain the ground deformation around Unzen Volcano by four-source model.

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