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Depth variations in seismic velocity in the subducting crust : Evidence for fluid-related embrittlement for intermediate-depth earthquakes

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Title: Depth variations in seismic velocity in the subducting crust : Evidence for fluid-related embrittlement for intermediate-depth earthquakes
Authors: Shiina, Takahiro Browse this author
Nakajima, Junichi Browse this author
Matsuzawa, Toru Browse this author
Toyokuni, Genti Browse this author
Kita, Saeko Browse this author
Keywords: subducting zone
oceanic crust
guided wave
seismic velocity
intermediate-depth earthquakes
fluid-related embrittelment
Issue Date: 28-Jan-2017
Publisher: American Geophysical Union
Journal Title: Geophysical research letters
Volume: 44
Issue: 2
Start Page: 810
End Page: 817
Publisher DOI: 10.1002/2016GL071798
Abstract: We investigated seismic wave velocity in the subducting crust of the Pacific slab beneath eastern Hokkaido, northern Japan. To detect depth-dependent properties of the seismic velocities in the crust, we analyzed guided waves that propagate in the crust and estimated P wave velocity (V-p) of 6.5-7.5km/s and S wave velocity (V-s) of 3.6-4.2km/s at depths of 50-100km. The results show that the obtained V-p and V-s are 10-15% lower than those expected for the fully hydrated mid-ocean ridge basalt, suggesting the existence of aqueous fluids by similar to 1 vol % in the crust at this depth range. Our observations suggest that overpressurized fluids channeled in the subducting crust plays as a dominant factor for facilitating the genesis of crustal earthquakes at intermediate depths.
Rights: An edited version of this paper was published by AGU. Copyright 2017 American Geophysical Union. Shiina, T., J. Nakajima, T. Matsuzawa, G. Toyokuni, and S. Kita (2017), Depth variations in seismic velocity in the subducting crust: Evidence for fluid- related embrittlement for intermediate- depth earthquakes, Geophys. Res. Lett., 44, 810–817, doi:10.1002/ 2016GL071798. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
Type: article
URI: http://hdl.handle.net/2115/66865
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 椎名 高裕

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