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- 山元 孝広
- 工業技術院地質調査所地質部
書誌事項
- タイトル別名
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- Holocene Sukawa Lahar Deposits at the Western Foot of Adatara Volcano, NE Japan
- アダタラ カザンニシ サンロク ノ カンシンセイスカワ ラハール タイセキブツ
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説明
The Sukawa lahar deposits (L1-L7), at the western foot of Adatara volcano, are made up of clay-rich matrix-supported massive breccia containing abundant hydrothermally altered andesite. The lowest L1 deposit extends 10 km from the Numanotaira crater, has a volume of 8.4 × 106 m3, and covers an area of 2.8 km2. This lahar occurred at 2400 y. B. P. and was presumably generated by a break of the Numanotaira crater lake during a phreatic eruption. The L2-L7 deposits, whose individual volumes are less than 4 × 105 m3, fill a channel incising the L1 deposit. These lahars took place at 1600 to 860 y. B. P. The grain-size data and the ratio of drop to travel distance (H/L) indicate that the Sukawa lahars are typical cohesive lahars. The Numanotaira crater is now filled by muddy slurry, and opens directly to the Iwo-Sukawa River on the western flank. The possible cohesive lahars along the Iwo-Sukawa River should be added to the potential hazard of this volcano.
収録刊行物
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- 火山
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火山 43 (2), 61-68, 1998
特定非営利活動法人 日本火山学会
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詳細情報 詳細情報について
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- CRID
- 1390282679280318848
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- NII論文ID
- 110003041624
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- NII書誌ID
- AN10512786
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- ISSN
- 21897182
- 04534360
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- NDL書誌ID
- 4491619
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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
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- 抄録ライセンスフラグ
- 使用不可