Attenuation structure beneath the volcanic front in northeastern Japan from broad-band seismograms

Details Attenuation structure beneath the volcanic front in northeastern Japan from broad-band seismograms Attenuation structure beneath the volcanic front in northeastern Japan from broad-band seismograms

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pepi..121..339t&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 121, Issue 3-4, p. 339-357.

Physics

9

Scientific paper

Anelastic structure in the asthenosphere beneath the volcanic front in northeastern Japan arc is estimated by using the spectral amplitude ratio data of P and S waves from about 100 events which occurred in the subducting Pacific slab below Japan. These earthquakes occurred within a 90km radius centered about the station Sawauchi (SWU), with focal depths ranging from 60 to 200km. Waveforms were recorded by the Carnegie broad-band three-component seismograph and were corrected for instrument responses, crustal reverberations, corner frequencies, and superimposed noise. Ray paths and travel times of P and S waves are calculated using a three-dimensional velocity model [Zhao, D., Hasegawa, A., Horiuchi, S., 1992. J. Geophys. Res. 97, 19909-19928]. We find a low-Q region (QS~70) extending down to 55km depth from the lower crust beneath the volcanic front. Using Q-temperature laboratory results [Sato, H., Sacks, I.S., Murase, T., Muncill, G., Fukushima, H., 1989. J. Geophys. Res. 94, 10647-10661], this implies a temperature of about 130°C higher than the eastern forearc region and about 30°C higher than the western backarc region, in good agreement with the tomographic results of Zhao et al. [Zhao, D., Hasegawa, A., Horiuchi, S., 1992. J. Geophys. Res. 97, 19909-19928]. This suggests that low velocities in the crust and uppermost mantle beneath SWU may be explained by a subsolidus temperature increase without partial melting.

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