Open AccessSome Recent Work on Earth Models, with Special Reference to Core Structure
Author(s) -
Gallen K. E.,
Haddon R. A. W.
Publication year - 1973
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1973.tb02412.x
Subject(s) - interpretation (philosophy) , core (optical fiber) , geology , mantle (geology) , simple (philosophy) , work (physics) , earth model , computer science , geophysics , physics , epistemology , philosophy , thermodynamics , programming language , telecommunications
Summary The earlier part of the paper gives background, relating to a sequence of Earth models A”, HB 1 , B 2 , HB 3 and HB 3 , from which we have inferred that various past interpretations of certain seismic PKP precursor readings in terms of regular ray theory are unsatisfactory. As a consequence, one of us (R.A.H.) has proposed a new interpretation of the precursors in terms of scattering near the mantle–core boundary. The later part of the paper gives details of the new interpretation and discusses some of the preliminary findings. On this interpretation, a simple two‐layer core can satisfy the entire body of data, including free Earth oscillation data, on the structure of the core, and the difficulties of arriving at a satisfactory overall Earth model appear to have been much reduced.