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Determination of intrinsic attenuation in the oceanic lithosphere-asthenosphere system.

Authors
  • Takeuchi, Nozomu1
  • Kawakatsu, Hitoshi1
  • Shiobara, Hajime1
  • Isse, Takehi1
  • Sugioka, Hiroko2
  • Ito, Aki3
  • Utada, Hisashi1
  • 1 Earthquake Research Institute, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 1130032, Japan. , (Japan)
  • 2 Graduate School of Science, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe, Hyogo 6578501, Japan. , (Japan)
  • 3 Japan Agency for Marine-Earth Science and Technology, Natsushima-cho 2-15, Yokosuka-shi, Kanagawa 2370061, Japan. , (Japan)
Type
Published Article
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Publication Date
Dec 22, 2017
Volume
358
Issue
6370
Pages
1593–1596
Identifiers
DOI: 10.1126/science.aao3508
PMID: 29269473
Source
Medline
License
Unknown

Abstract

We recorded P and S waves traveling through the oceanic lithosphere-asthenosphere system (LAS) using broadband ocean-bottom seismometers in the northwest Pacific, and we quantitatively separated the intrinsic (anelastic) and extrinsic (scattering) attenuation effects on seismic wave propagation to directly infer the thermomechanical properties of the oceanic LAS. The strong intrinsic attenuation in the asthenosphere obtained at higher frequency (~3 hertz) is comparable to that constrained at lower frequency (~100 seconds) by surface waves and suggests frequency-independent anelasticity, whereas the intrinsic attenuation in the lithosphere is frequency dependent. This difference in frequency dependence indicates that the strong and broad peak dissipation recently observed in the laboratory exists only in the asthenosphere and provides new insight into what distinguishes the asthenosphere from the lithosphere.

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