Frequency dependence of Q in the mantle underlying the shield areas of eurasia

Details Frequency dependence of Q in the mantle underlying the shield areas of eurasia Frequency dependence of Q in the mantle underlying the shield areas of eurasia

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985tege.rept.....d&link_type=abstract

Final Technical Report, 15 Nov. 1982 - 30 Dec. 1984 Teledyne Geotechnical, Alexandria, VA.

Mathematics

Asia, Earth Mantle, Europe, Seismology, Amplitudes, Bearing (Direction), Broadband, Dependence, Depth, Detection, Earth Planetary Structure, Earthquakes, Frequencies, Mathematical Models, Nuclear Explosions, P Waves, Ratios, S Waves, Seismic Waves, Spectrum Analysis, United States, Wave Attenuation, Waveforms

Scientific paper

In Part I the results of short and intermediate period data analyses for the determination of a frequency dependent Q model of the mantle under the shield areas of Eurasia are presented. The spectra of short period P waves from nuclear explosions in the 1-8 Hz frequency range give t* sub p = approx. 0.15-0.2 seconds. Part II presents analyses of long period data. Long period multiple S and ScS phases observed in northern Europe were analyzed to determine mantle attenuation in the 0.02 to 0.2 Hz range under the Eurasian shield. Two groups of events are used: deep Far-Eastern earthquakes and large earthquakes near the edges of the shield areas of Eurasia. Part III provides the Q model. A large set of broad band data was analyzed to determine the frequency and depth dependence of Q for P and S waves under the northern shield areas of Eurasia. A wide range of techniques utilizing spectra, amplitude ratios and waveform modeling were used to derive apparent and absolute t* estimated for P and S waves covering the seismic band between 0.01 to 10 Hz. A supplement discusses methodologies for estimating t*(f) from Short Period Body Waves and Regional Variations of t*(f) in the United States.

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