Anelastic structure of the upper mantle beneath the northern Philippine Sea

Details Anelastic structure of the upper mantle beneath the northern Philippine Sea Anelastic structure of the upper mantle beneath the northern Philippine Sea

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..140..319s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 140, Issue 4, p. 319-329.

Physics

4

Anelasticity, Upper Mantle, Northern Philippine Sea, Phase Pair Method, Q

Scientific paper

We investigated the upper mantle anelastic structure beneath the northern Philippine Sea region, including the Izu-Bonin subduction zone and the Shikoku Basin. We used regional waveform data from 69 events in the Pacific and the Philippine Sea slabs, recorded on F-net and J-array network broadband stations in western Japan. Using the S-P phase pair method, we obtained differential attenuation factors, δt*, which represent the relative whole path Q. We conducted a tomographic inversion using 978 δt* values to invert for a fine-scale (50-100km) three-dimensional anelastic structure.
The results shows two high-Q regions (QP>1000) which are consistent with the locations of the Pacific and the Philippine Sea slabs. Also there is a low-Q (QP~110) area extending to the deeper parts (350-400km) of the model just beneath the old spreading center and the Kinan Seamount Chain in the Shikoku Basin. A small depth dependence of the laterally averaged QP was found, with values of 266 (0-250km), 301 (250-400km), and 413 (400-500km).

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