Statistics – Computation
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011geoji.185.1379s&link_type=abstract
Geophysical Journal International, Volume 185, Issue 3, pp. 1379-1383.
Statistics
Computation
Core, Outer Core And Inner Core, Body Waves, Computational Seismology, Wave Propagation
Scientific paper
Stacks of over 90 000 long-period seismograms recorded by the global seismic networks resolve many seismic phases but fail to detect the inner-core shear phase PKJKP. We compare these results to synthetic seismograms computed for PREM using the spectral-element method and show that expected PKJKP amplitudes are over 10 times smaller than signal-generated 'noise' caused by high-order P surface multiples and reverberations from upper-mantle discontinuities. Indeed, PKJKP can only be seen in synthetic seismograms when differences are taken between two sets of synthetics generated from Earth models with slightly different inner-core shear velocities. These results suggest that routine observation of PKJKP is unlikely and that reported observations, if real, must have resulted from exceptional focusing effects or inner-core attenuation much less that current models.
Liu Qinya
Rychert Catherine A.
Shearer Peter M.
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