Other
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..285s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 4, p. 285-288.
Other
22
P Waves, Propagation Velocity, Seismic Waves, Seismology, Structural Properties (Geology), Earth Core, Earth Mantle
Scientific paper
Differential travel times between various branches of PKP are used to study the P velocity structure in D-double prime. Simple geometrical ray tests show that the ray path of the AB branch, which almost grazes the core-mantle boundary (CMB), is much more sensitive to the velocity structure in D-double prime than the DF and BC branches, which have small incident angles at the CMB. Thus, the differential travel times of AB and DF and AB and BC provide an effective means of studying lateral variations in D-double prime. The scatter of BC-DF data is half the scatter of AB-DF and AB-BC data, suggesting that the lowermost mantle has more influence on AB-DF and AB-BC data than the bottom of the outer core or the top of the inner core. Variations of the lower mantle preliminary reference earth model that contain a discontinuity or a more distributed 1.5 percent velocity reduction in the lower 500 km can explain the discrepancy. The largest variations in the AB-DF data are associated with paths sampling beneath the mid-Pacific. The AB-DF data along the mid-Pacific paths are about 1.0 s smaller than the average of the AB-DF from other paths and the differences are as large as 2.0 s at some distances.
Helmberger Don V.
Song Xiaodong
No associations
LandOfFree
Effect of velocity structure in D-double prime on PKP phases 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 Effect of velocity structure in D-double prime on PKP phases, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of velocity structure in D-double prime on PKP phases will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1274215