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- W2014065843 abstract "The spectral amplitude ratio of the phases pP and P is influenced by source conditions and the crust-upper mantle structure near the source and at the recording station. The effect at the recording station is expected to be small because of nearly identical response of the recording instrument and its substructure to the phases that are incident below the crust at similar angles.The spectral ratios of pP/P for 48 earthquakes with focal depths ranging between 100 and 700 km are computed. Corrections for the effect of geometrical spreading and reflection in the outer shell above the focus are applied. The apparent mean Q values for the dilatational waves in the deep seismic zones of the upper mantle are computed from the slope of the adjusted spectral ratios. There is an indication of a minimum in the intrinsic Q near a depth at 200 km. The data of three South American earthquakes with focal depths between 120 and 200 km result in unacceptable negative values for (Q). Possible causes of these anomalous observations are discussed." @default.
- W2014065843 created "2016-06-24" @default.
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- W2014065843 date "1971-05-10" @default.
- W2014065843 modified "2023-09-25" @default.
- W2014065843 title "Seismic dissipation in deep seismic zones from the spectral ratio ofpP/P" @default.
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- W2014065843 doi "https://doi.org/10.1029/jb076i014p03337" @default.
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