Velocity constraints for the inner core inferred from long-period PKP amplitudes

Details Velocity constraints for the inner core inferred from long-period PKP amplitudes Velocity constraints for the inner core inferred from long-period PKP amplitudes

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pepi...31..171h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 31, Issue 2, p. 171-185.

Physics

15

Scientific paper

Long-period PKP amplitudes from 16 earthquakes in the distance range 110- 170° are compared with theoretical amplitudes which are derived from synthetic seismograms calculated for 56 systematic modifications of Earth model 1066B in the inner core. A suitable normalization procedure allows for the common representation of all observed amplitudes as a function of epicentral distance. Using the theoretical amplitude distributions it can be shown that the parameters of a regression line through the logarithmic and normalized amplitudes between 110 and 134° are related to the velocity and density jump at the inner-core boundary (ICB). The analysis shows that the dominant influence on the PKP amplitudes is the P-velocity jump which can be restricted to 0.64 +/- 0.05 km s-1. There exists a trade-off between the S-velocity jump and the density jump. Restricting the latter to the reasonable range 0-1.2 g cm-3 the S-velocity jump at the ICB can be inferred to be 2.5-3.0 km s-1. A rather strong S-velocity gradient below the ICB follows from the condition that the S-wave travel-time through the inner core agrees with that implied by free oscillation observations. This leads to central S-velocities between 3.81 and 4.15 km s-1, assuming a parabolic velocity law.
Present address: Geophysikalisches Institut der Universität Karlsruhe, 7500 Karlsruhe, Hertzstr. 16 F.R.G.

Affiliated with

Also associated with

No associations

Rating

Velocity constraints for the inner core inferred from long-period PKP amplitudes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Velocity constraints for the inner core inferred from long-period PKP amplitudes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Velocity constraints for the inner core inferred from long-period PKP amplitudes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1307482