Imaging of three-dimensional small-scale heterogeneities in the Hidaka, Japan region: coda spectral analysis

Details Imaging of three-dimensional small-scale heterogeneities in the Hidaka, Japan region: coda spectral analysis Imaging of three-dimensional small-scale heterogeneities in the Hidaka, Japan region: coda spectral analysis

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004geoji.158..998t&link_type=abstract

Geophysical Journal International, Volume 158, Issue 9, pp. 998-1008.

Astronomy and Astrophysics

Astronomy

2

Collision Belt, Lithosphere, Scattering, Seismic Coda

Scientific paper

While large-scale heterogeneities have been studied intensively by seismic tomography with traveltime data, small-scale heterogeneities are not fully investigated yet. We obtained the 3-D spatial distribution of small-scale heterogeneities as relative scattering coefficients in the Hidaka, Japan, region using the spatial variation of high-frequency coda power spectra. We analysed 530 seismograms recorded at 62 stations for nine local earthquakes in the frequency range of 1-32 Hz. After correcting source, station and propagation effects, we assigned the spatial and temporal variations of observed power spectra of coda waves into the 3-D distribution of scattering coefficient, based on single and isotropic scattering models. Small-scale heterogeneities are distributed not only in a non-uniform manner but also differently among scale lengths estimated from their frequency dependence. An area of large relative scattering coefficient in 2 and 16 Hz is located at a depth shallower than 45 km in the southwest of the Hidaka Mountains, correlating well with a highly active area of microearthquakes. At a depth of 60-120 km, two dipping zones of large scattering coefficient are imaged beneath the summit of the Hidaka Mountains. These zones may imply two layers of strong seismic-wave reflection, consistent with the upper and lower planes of the double seismic zone in the subducting Pacific Plate, as determined by the hypocentral distribution in this region.

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