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  1. 防災科研関係論文

Seismic scatterers within subducting slab revealed from ambient noise autocorrelation

https://nied-repo.bosai.go.jp/records/4560
https://nied-repo.bosai.go.jp/records/4560
af6aa561-c20e-47c1-b210-d113d99721ba
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Seismic scatterers within subducting slab revealed from ambient noise autocorrelation
言語
言語 eng
著者 Yoshihiro Ito

× Yoshihiro Ito

en Yoshihiro Ito

Search repository
Katsuhiko Shiomi

× Katsuhiko Shiomi

en Katsuhiko Shiomi

Search repository
抄録
内容記述タイプ Other
内容記述 We reconstructed new migrated images from autocorrelation functions of ambient noise at seismic stations in northeastern Japan. During the analysis period, the autocorrelation functions, having a frequency range of 0.5-2 Hz, showed some coherent signals at large lapse times of 10-50 s as well as at small lapse times of less than 10 s. These signals were also coherent in space along cross sections across the Japan subduction zone. The migrated images show seismic scatterers within the subducting Pacific Slab at the depth range of 50-150 km. The distribution of the scatterers within the subducting slab is comparable to the double seismic zone in the subduction zone; in particular, the thickness of the distribution of the seismic scatterers is consistent with that of two planes of the double seismic zone. This indicates inhomogeneities in the seismic velocity structure around the upper and lower planes of the seismicity. The new migrated images suggest that seismic scatterers, such as fluid from dehydration reactions of the hydrated metamorphosed mantle, exist in the lower as well as upper plane of the seismicity in the double seismic zone; this fluid may act as a scatterer within the subducting slab. Citation: Ito, Y., and K. Shiomi (2012), Seismic scatterers within subducting slab revealed from ambient noise autocorrelation, Geophys. Res. Lett., 39, L19303, doi:10.1029/2012GL053321.
言語 en
書誌情報 en : GEOPHYSICAL RESEARCH LETTERS

巻 39, 号 19, p. 3, 発行日 2012-10
出版者
言語 en
出版者 AMER GEOPHYSICAL UNION
ISSN
収録物識別子タイプ ISSN
収録物識別子 0094-8276
DOI
関連識別子 10.1029/2012GL053321
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