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Determination of earthquake source parameters from waveform data for studies of global and regional seismicity
It is possible to use the waveform data not only to derive the source mechanism of an earthquake but also to establish the hypocentral coordinates of the ‘best point source’ (the centroid of the
S40RTS: A degree-40 shear-velocity model for the mantle from new Rayleigh wave dispersion, teleseismic traveltime and normal-mode splitting function measurements
We have developed model S40RTS of shear-velocity variation in Earth's mantle using a new collection of Rayleigh wave phase velocity, teleseismic body-wave traveltime and normal-mode splitting
Global transition zone tomography
[1] Our understanding of large-scale mantle dynamics depends on accurate models of seismic velocity variation in the upper mantle transition zone (400–1000 km depth). With the Mode Branch Stripping
Mapping the upper mantle: Three‐dimensional modeling of earth structure by inversion of seismic waveforms
A method is presented for the inversion of waveform data for the three-dimensional distribution of seismic wave velocities. The method is applied to data from the global digital networks
Surface Waves in a Laterally Varying Layered Structure
Sum17zur.y A kind of ray theory is developed for surface waves in a layered elastic medium in which there are gradual lateral variations in the thicknesses of the layers and in the elastic parameters
Data from the Global Digital Seismograph Network were used to obtain ‘centroid-moment tensor’ solutions using the method of Dziewonski et al. (1981). Results were obtained for 201 earthquakes ranging
A systematic search for mantle discontinuities using SS‐precursors
We perform a systematic search for reflectors in the upper and lower mantle using SS‐precursors. The largest number of robust reflections comes from a depth of 220 km, which we associate with the
Anisotropy of the inner core inferred from PKIKP travel times
Travel-time residuals of the PKIKP phase observed between 170° and 180° show an axisymmetric pattern of degree 2 with an amplitude of about 2 seconds. The effect at shorter distances is much less
Evidence for inner core anisotropy from free oscillations
Previous hypotheses concerning the cause of anomalous splitting in free oscillation spectra have led to models which are difficult to accept from the physical point of view - involving either
Ratio of relative S to P velocity heterogeneity in the lower mantle
The parameter v = ∂lnνs/∂lnνp, the ratio of relative S to P velocity heterogeneity, can be measured seismically and is important in determining the mineral physics of the deep mantle. However,