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Depth variations in seismic velocity in the subducting crust : Evidence for fluid-related embrittlement for intermediate-depth earthquakes
| 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)
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Submitter: 椎名 高裕
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