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  1. 防災科研関係論文

Stress change prior to the major events in the 1989 earthquake swarm off the eastern Izu Peninsula, Japan

https://nied-repo.bosai.go.jp/records/4995
https://nied-repo.bosai.go.jp/records/4995
19869a15-d5f1-4ae7-801d-127e0e67a30c
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Stress change prior to the major events in the 1989 earthquake swarm off the eastern Izu Peninsula, Japan
言語
言語 eng
著者 Hironori Kawakata

× Hironori Kawakata

en Hironori Kawakata

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Hiroshi Ogasawara

× Hiroshi Ogasawara

en Hiroshi Ogasawara

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Shoji Sekiguchi

× Shoji Sekiguchi

en Shoji Sekiguchi

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Shizuka Uyama

× Shizuka Uyama

en Shizuka Uyama

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Kazuo Mino

× Kazuo Mino

en Kazuo Mino

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抄録
内容記述タイプ Other
内容記述 We investigate a temporal change in a stress parameter of earthquakes that occurred in the 1989 swarms off the eastern Izu Peninsula in Japan. We use the energy index (EI), which have been monitored in deep South African gold mines for predicting major events, as an estimate of apparent stress that is proportional to the ratio of seismic energy (E) to seismic moment (Mo). EI measures an excess or shortage in E with respect to the empirical relationship between E and Mo. We check that EI is almost proportional to the apparent stress for the ranges of Mo and frequency for our analysis, although E is underestimated due to the artifact of limited frequency band of monitoring. The largest events (M = 5.2 and 5.5) took place off the tip of a vertical crack, which opened associated with magma intrusion. While the opening continued to load the source areas of the M 5.2 and 5.5, we find significant decrease in EI prior to the events. Based on the experimental result that the stress decreases when yielding takes place prior to final failure, we interpret this observation as yielding in the vicinity of the large earthquake hypocenters, following a rapid increase in stress caused by magma intrusion. Copyright c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS)
The Seismological Society of Japan
The Volcanological Society of Japan
The Geodetic Society of Japan
The Japanese Society for Planetary Sciences
TERRAPUB.
言語 en
書誌情報 en : Earth, Planets and Space

巻 58, 号 3, p. 305-314, 発行日 2006
出版者
言語 en
出版者 Springer Berlin
ISSN
収録物識別子タイプ ISSN
収録物識別子 1880-5981
DOI
関連識別子 10.1186/BF03351926
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