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  1. 防災科研関係論文

Very low frequency earthquakes related to small asperities on the plate boundary interface at the locked to aseismic transition

https://nied-repo.bosai.go.jp/records/4515
https://nied-repo.bosai.go.jp/records/4515
aa815005-382d-469d-9c0e-56623acaf26d
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Very low frequency earthquakes related to small asperities on the plate boundary interface at the locked to aseismic transition
言語
言語 eng
著者 Yoshihiro Ito

× Yoshihiro Ito

en Yoshihiro Ito

Search repository
Kazushige Obara

× Kazushige Obara

en Kazushige Obara

Search repository
Takanori Matsuzawa

× Takanori Matsuzawa

en Takanori Matsuzawa

Search repository
Takuto Maeda

× Takuto Maeda

en Takuto Maeda

Search repository
抄録
内容記述タイプ Other
内容記述 Very low frequency (VLF) seismic signals observed in southwestern Japan are evidently radiated from shear slips on the upper surface of the subducting Philippine Sea Plate. We used grid moment tensor inversion and centroid moment tensor inversion to calculate 242 moment tensor solutions with moment magnitudes between 3.1 and 3.8 from continuous seismograms recorded over a 5 year period by using a very dense broadband seismic network. At least 5-10 sequences of repetitive activity were observed during the 5 years. The VLF events formed clustered distributions along the 35 km isodepth contour of the subducting plate surface. The nodal planes (which dip landward) of moment tensor solutions of the VLF events reflected the configuration of the subducting plate interface. The slip vectors were consistent with the direction of movement of the subducting plate; the dip and strike of the slip vectors clearly reflected the configuration of the upper surface of the subducting plate. We found that the rates of seismic moment release per unit area associated with five major VLF clusters were very similar, although both the seismic magnitudes and sizes of the clusters varied considerably. The rate of seismic moment released from detectable VLF sources was 0.1% of the rates of short-term slow slip events, suggesting that the source areas occupied only 0.1% of the fault segment on which the short-term slow slip events occurred.
言語 en
書誌情報 en : JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH

巻 114, 発行日 2009-11
出版者
言語 en
出版者 AMER GEOPHYSICAL UNION
ISSN
収録物識別子タイプ EISSN
収録物識別子 2169-9356
DOI
関連識別子 10.1029/2008JB006036
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