書誌事項
- タイトル別名
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- Ground Deformation and Magma Reservoir at Aso Volcano : Location of Deflation Source Derived from Long-term Geodetic Surveys
- アソカザン ノ ジバン ヘンドウ ト マグマ ダマリ チョウキカン ノ ヘンドウ ト アツリョク ゲン ノ イチ
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説明
So far the ground deformation associated with a magma supply system of Aso Volcano had not been discussed because any clear signals in ground deformations and volcanic earthquake activity had been hardly observed near the Nakadake active crater during its activity enhancement cycles. In this article, however, the deflation source and magma supply system is investigated by the long-term geodetic surveys. The secular subsidence is observed in the Kusasenri area about 3km west of the Nakadake active crater from the 1951’s levelling survey in compiled levelling surveys along the Bouchuu-line since 1937. While the ground deformation near the active crater has been obscure. The source of this deflation near the Kusasenri area is estimated on the basis of the spherical pressure source model through the non-linear least square method with using recent survey data which include the Bouchuu-line and an extended survey route. The deflation source is located beneath the Kusasenri area at about 5km depth. However, recent volume changes at the spherical deflation source are smaller than before 1959. The location of the deflation source coincides with the low P- and S-wave velocity body in the 3D seismic velocity structure. This fact supports a hypothesis that the low seismic wave velocity body represents a magma reservoir. Therefore this magma reservoir beneath the Kusasenri area must be connected to the Nakadake active crater. We inferred a rigid conduit in the magma supply system from the obscure ground deformation in the vicinity of the Nakadake crater.
収録刊行物
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- 火山
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火山 51 (5), 291-309, 2006
特定非営利活動法人 日本火山学会
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キーワード
詳細情報 詳細情報について
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- CRID
- 1390282679281545088
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- NII論文ID
- 110004857941
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- NII書誌ID
- AN10512786
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- ISSN
- 21897182
- 04534360
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- NDL書誌ID
- 8560777
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
- Crossref
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- 抄録ライセンスフラグ
- 使用不可
