Open AccessMantle dynamics and geoid Green functions
Author(s) -
Corrieu Valerie,
Thoraval Catherine,
Ricard Yanick
Publication year - 1995
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1995.tb01835.x
Subject(s) - geoid , mantle (geology) , geology , geophysics , compressibility , geodesy , lithosphere , gravity anomaly , physics , seismology , mechanics , tectonics , paleontology , oil field , measured depth
SUMMARY We compute Green functions relating mantle mass heterogeneities to geoid undulations using both incompressible and radially compressible mantle rheologies. Our results differ from those previously published by Forte & Peltier (1991) and Thoraval, Machetel & Cazenave (1994). This is due to two factors. Instead of taking gravity as constant throughout the mantle, we compute it self‐consistently with the radial density profile. Secondly, we show that in the mathematical formulation of the compressible case, stresses are not continuous through a density jump. We then point out that the presence of a surface ocean has no additional effect on the geoid signal associated with internal mantle mass anomalies. We apply this formalism to a geodynamic model of mantle density variations and show that an excellent fit to the observed geoid can be obtained.