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Gate-Geology-and-Geophysics-2014-->View question

The PKiKP phase denotes the passage of a seismic wave in the Earth as: (-Gate geology and geophysics 2014)

(A) P in mantle, S in outer core, reflected as P from inner-outer core boundary, S in outer core, P in mantle and crust 
(B) P in crust, P in mantle, reflected as P from core-mantle boundary, P in mantle, P in crust 
(C) P in mantle, P in outer core, P in inner core, P in outer core, P in mantle and crust 
(D) P in mantle, P in outer core, reflected as P from inner-outer core boundary, P in outer core, P in mantle and crust


Asked On2017-07-06 10:01:49 by:Aparna-Dasgupta

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(D) P in mantle, P in outer core, reflected as P from inner-outer core boundary, P in outer core, P in mantle and crust

 The seismic phase PKJKP, which traverses the inner core as a shear wave, and would provide direct evidence for its solidity, has been difficult to detect. Using stacked broadband records from the Gra"fenberg array in Germany, we document a high signal to noise phase, whose arrival time and slowness agree with theoretical predictions for PKJKP. The back-azimuth of this arrival is also consistent with predictions for PKJKP as is the comparison with a pseudo-liquid inner core model. Envelope modeling of the PKJKP waveform implies a slightly larger shear velocity gradient with depth in the inner core than that in PREM model.

Answerd on:2017-07-10 Answerd By:Amogh

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