Estimation of the attenuation operator for multiple-ScS waves using digitally recorded broadband data

Details Estimation of the attenuation operator for multiple-ScS waves using digitally recorded broadband data Estimation of the attenuation operator for multiple-ScS waves using digitally recorded broadband data

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..832s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Aug. 1988, p. 832-835.

Mathematics

4

Earthquakes, Seismic Waves, Tectonics, Wave Attenuation, Asia, North America, Operators (Mathematics), Seismograms, Waveforms

Scientific paper

Using broadband multiple-ScS waveforms obtained from the Regional Seismic Test Network data on seven deep-focus earthquakes in the Izu-Okhotsk region, the frequency-dependent complex attenuation operator for multiple-ScS waves was estimated by the source-independent method of Jordan and Sipkin (1977). For the mostly tectonic path crossing the eastern margin of Asia and northwestern North America, the results yielded a median ScS(n)-ScS(n-1) travel time residual of +0.6 sec with respect to the Jeffreys-Bullen velocity model and a quality factor, Q(ScS), of 182 + or - 21 over the frequency band 0.017-0.117 Hz. In this band there is no apparent frequency dependence. Even though the data contain much higher frequencies, the multiple-ScS phases lose coherence beyond about 0.117 Hz, and the results became unstable.

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