2024-03-29T11:23:20Z
https://repository.dl.itc.u-tokyo.ac.jp/oai
oai:repository.dl.itc.u-tokyo.ac.jp:00032597
2022-12-19T04:08:35Z
80:4535:4629:4637
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Why do displacement velocities of the Niijima, Shikinejima, and Koudushima islands vary over time? : Crustal activity accompanied by the 2000 Eruption of Miyakejima Volcano
新島・式根島・神津島の変動はなぜ時間変化するのか? : 2000年三宅島噴火に伴う地殻活動
飯尾, 能久
126114
453
Niijima
Shikinejima
GPS
dyke
and magma chamber
application/pdf
Displacement velocities of the Niijima, Shikinejima, and Koudushima islands to Minamiizu from June to August in 2000 measured by the GEONET vary over time. It seems that the displacement velocities of the Shikinejima and Niijima islands show a reverse correlation. This can be explained by two pairs of dyke and fault plane, the northern and southern pairs. It is inferred from seismic activity that these pairs alternately became active. The displacement velocity of the Shikinejima was large when the southern pair was active, while that of the Niijima was large when the northern pair was active. Further, all of the displacement velocities became small for a few days after a large earthquake (M>6) occurred. This might be explained by a decrease in volumetric strain in and around the magma chambers in the lower crust.
departmental bulletin paper
東京大学地震研究所
2002-07-30
application/pdf
東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo
1
77
77
85
AN00162258
00408972
https://repository.dl.itc.u-tokyo.ac.jp/record/32597/files/ji0771006.pdf
jpn