Mathematics – Logic
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1943p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B2, p. 1943-1955.
Mathematics
Logic
30
Boundaries, Earth Core, Earth Mantle, Seismology, Structural Properties (Geology), Gaps, Imaging Techniques, Least Squares Method, Mathematical Models, Spherical Harmonics, Tomography
Scientific paper
Large structure in tomographic images of the core-mantle boundary (CMB) found by fitting low-degree spherical harmonic models to International Seismological Centre travel time data by linear least squares may be artifacts of the fitting procedure rather than necessary features of earth. It is shown here that a common imaging procedure (fitting low-degree models to the data by least squares using linearized ray theory) tends to produce spurious structure related to the inhomogeneous sampling of the CMB by travel time data. This occurs in the presence of noise even when the true structure is smooth. Thus, the fact that travel times measure volume integrals greater than path integrals of velocity structure is not enough to guarantee that low-degree least squares models reflect the low-degree structure of the CMB.
Pulliam Jay R.
Stark Philip B.
No associations
LandOfFree
Bumps on the core-mantle boundary - Are they facts or artifacts? 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 Bumps on the core-mantle boundary - Are they facts or artifacts?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bumps on the core-mantle boundary - Are they facts or artifacts? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1275521