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- 奥野 充
- 福岡大学理学部・産学官連携研究機関国際火山噴火史情報研究所
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- レナート ソリデュム ジュニア
- フィリピン火山地震研究所
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- マリア ハナ ミラブエノ
- フィリピン火山地震研究所
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- クリストファー ニューホール
- 南洋理工大学シンガポール地球観測研究所
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- 下司 信夫
- (独)産業技術総合研究所地質情報研究部門
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- 須貝 俊彦
- 東京大学大学院新領域創成科学研究科
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- 田中 明子
- (独)産業技術総合研究所地質情報研究部門
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- 小林 哲夫
- 鹿児島大学大学院理工学研究科(理学系)
書誌事項
- タイトル別名
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- Introduction to the Special Issue on “Geology and Recent Eruptions of Irosin Caldera and Bulusan Volcano, Southern Luzon, Philippines (Part I)”
- ショウトクシュウ 「 フィリピン ・ ルソントウ ノ イロシンカルデラ ト ブルサン カザン ノ チシツ ト サイキン ノ フンカ カツドウ(ソノ 1)」 ジョロン
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抄録
The Irosin caldera located at the southeastern tip of Luzon Island in the Philippines was formed by the eruption of 41cal kBP Irosin ignimbrite. Bulusan, a post-caldera volcano, has repeated phreatic eruptions during historical times. The special issue on “Geology and Recent Eruptions of Irosin Caldera and Bulusan Volcano, Southern Luzon, Philippines (Part I)” provides various data and discussion mainly on the formation of Irosin caldera. First based on interpretations of volcanic landforms, the evolution of 84 volcanoes in the Philippines is outlined (Moriya, 2014). Fifty-six stratovolcanoes, three caldera volcanoes accompanying four post-caldera volcanoes, three lava domes, four scoria cones including two maars, four lava fields, and ten shield volcanoes are identified. The sequence of caldera-forming eruption at Irosin consists of a precursory fine ash eruption (Malobago lava dome), plinian pumice fallout, and intra-plinian flow deposits (Kobayashi et al., 2014a). Evidence of ground shaking during the plinian phase was also found. The total DRE volume of erupted tephra is estimated to be 30 km3 (VEI = 6). A gravity survey in February 1996 revealed a semi-circular feature with a steep gravity gradient in the Bouguer anomalies, which corresponds clearly to the southern rim of the Irosin caldera (Komazawa et al., 2014). The funnel-shaped depression structure of the gravity basement, which is significantly smaller than that of the topographic depression, was recognized from a three-dimensional analysis of residual gravity anomalies. The mass deficiency was estimated to be 1.1 × 1010 tons, corresponding to 40 km3 of DRE volume. Four thermoluminescence (TL) ages (36 ± 8 ka, 38 ± 10 ka, 33 ± 8 ka and 45 ± 10 ka) are obtained from the matrix and lithic fragments of the ignimbrite and co-ignimbrite ash-falls, respectively (Takashima and Kobayashi, 2014). Of these, the first two ages are in good agreement with a radiocarbon age of 41 cal kBP. A pictorial of representative outcrops is offered to provide an understanding of the geology in and around the caldera (Kobayashi et al., 2014b). Recent activity at the Bulusan volcano is described and discussed in the next issue (Part II).
収録刊行物
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- 地学雑誌
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地学雑誌 123 (1), 82-88, 2014-02-25
公益社団法人 東京地学協会
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詳細情報 詳細情報について
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- CRID
- 1390001204237292288
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- NII論文ID
- 130003395495
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- NII書誌ID
- AN00322536
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- ISSN
- 18840884
- 0022135X
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- NDL書誌ID
- 025300631
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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
- Crossref
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- KAKEN
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