Coda attenuation in the Lützow-Holm Bay region, East Antarctica

Details Coda attenuation in the Lützow-Holm Bay region, East Antarctica Coda attenuation in the Lützow-Holm Bay region, East Antarctica

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pepi...67...65a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 67, Issue 1-2, p. 65-75.

Physics

7

Scientific paper

The frequency-dependent coda Qc-1 was estimated for the Lützow-Holm Bay region, East Antarctica, on the basis of the single-scattering model, and discussed together with Qc-1 data of Kyoto, Japan, as an example of an active region. Coda waves from six shallow earthquakes, observed with a local telemetry seismic network installed along the Soya Coast, were analyzed with narrow band-pass filters. Qc-1 for a lapse time of 20-40 s was estimated to be 0.00495 ƒ;-0.776 for a frequency of 4-16 Hz, and Qc-1 for 150-210 s was 0.00335 ƒ;-0.926 for 1-24 Hz. In comparison with Qc-1 data for Kyoto and other regions with various tectonic conditions, Qc-1 in the Lützow-Holm Bay region was characterized by large values at low frequency (around 1 Hz) and smaller values at higher frequency. From the single-scattering model, Qc-1 suggests a strong frequency dependence of intrinsic absorption for S waves. Assuming that the observed Qc-1 reflects scattering loss of energy, and taking account of the geological conditions and the extremely low seismic activity in the East Antarctic continental shield, it is suggested that the frequency-dependent Qc-1 is attributable to large scattering loss in the lower-frequency range caused by large-scale heterogeneities as a result of velocity and/or density perturbations.

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