Somma-Vesuvio, Pollena eruption, laharic deposits, debris flows, burial process
その他のタイトル
Reconstruction of Burial Process of Roman Villa on the Northern Flank of Mt. Vesuvius, Italy : insights from laharic deposits of the 472 eruption newly discovered in 2006－2008
東京大学地震研究所
環境防災総合政策研究機構
神戸大学理学部
国立西洋美術館
Earthquake Research Institute, University of Tokyo
Crisis & Environmental Management Policy Institute
Faculty of Science, Kobe University
The National Museum of Western Art
抄録
Burial process of Roman Villa on the northern flank of Mt. Vesuvius, Italy, was reconstructed based on sedimentation processes of laharic deposits newly discovered during 2006-2008 for the extended excavation site in NE to E parts of the Roman Villa. The laharic deposits are distributed on the lower level of the excavation site. The deposits are divided into four subunits, G1-MfL1, G1-DfL1, G1-MfL2, G1-DfL2, based on their sedimentary facies (Mf and Df facies). Mf is characterized by massive and matrix-supported facies, indicating en masse deposition from a laminar flow process, and Df is characterized by stratified and clast supported facies, indicating grain-by-grain aggradation from suspension or traction process. These different types of facies are partially transitional and attributed to variations of sediment/water ratio and internal stress condition inside flows, and may be resulted from an evolutional process, like a flow transformation, of a single debris flow. These laharic deposits directly overlie pyroclastic fallout deposits (G1-Af) in the initial phase of the AD 472 eruption, but are eroded and covered by epiclastic deposits (G1-Mf1, 2, 3, 4 and G1-Df) derived from later- and larger-scale laharic events related to the same eruption. The later laharic deposits include more amounts of basement lava of Mt. Somma, compared with the newly discovered deposits. Characteristics and interpretation of the deposits suggest that lahars just after the 472 eruption came from the north to bury the lower level of buildings and have experienced various types of sedimentation processes. An erosion of the edifice of Mt. Somma may have mainly acted in the later laharic events.
雑誌名
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
巻
84
号
4
ページ
271 - 289
発行年
2009
ISSN
00408972
書誌レコードID
AN00162258
日本十進分類法
051.1
出版者
東京大学地震研究所
出版者別名
Earthquake Research Institute, University of Tokyo
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ヴェスヴィオ火山北麓で発見されたローマ時代の遺跡の埋没過程 : 2006～2008年に新たに発見された472年噴火による土石流堆積物にもとづく再構築
IHO84401.pdf
(3.07MB)
