Structure, composition, and state of the core
Article first published online: 12 APR 2012
©1971. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 52, Issue 5, pages IUGG 175–IUGG 178, May 1971
How to Cite
1971), Structure, composition, and state of the core, Eos Trans. AGU, 52(5), IUGG 175–IUGG 178, doi:10.1029/EO052i005pIU175.(
- Issue published online: 12 APR 2012
- Article first published online: 12 APR 2012
Since 1967 two major advances in our knowledge of the core and core-mantle boundary have occurred. First, the giant large-amplitude seismic array (Lasa) in Montana provided convincing observations of reflections (PKiKP) from the inner-core boundary (ICB); second, evidence grew that a low-velocity shell existed in P and S above the mantle-core boundary (MCB).
After the recent energetic studies of the upper mantle, there are signs of quickening geophysical interest in the physical state of the earth's core. The precise nature of the striking structural discontinuities that define the MCB and ICB is of importance to solid-state physics, to geochemistry, and to geophysics. In particular, laboratory shock-wave results must be matched against the seismological inferences.