Holocene Sukawa Lahar Deposits at the Western Foot of Adatara Volcano, NE Japan
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- YAMAMOTO Takahiro
- Geological Survey of Japan
Bibliographic Information
- Other Title
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- 安達太良火山西山麓の完新世酸川ラハール堆積物
- 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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Description
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.
Journal
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- BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN
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BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 43 (2), 61-68, 1998
The Volcanological Society of Japan
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Details 詳細情報について
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- CRID
- 1390282679280318848
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- NII Article ID
- 110003041624
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- NII Book ID
- AN10512786
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- ISSN
- 21897182
- 04534360
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- NDL BIB ID
- 4491619
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed