Gravity/topography admittance inversion on Venus using niching genetic algorithms

Details Gravity/topography admittance inversion on Venus using niching genetic algorithms Gravity/topography admittance inversion on Venus using niching genetic algorithms

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30spla1l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 19, pp. PLA 1-1, CiteID 1994, DOI 10.1029/2003GL017515

Physics

Geophysics

6

Geodesy And Gravity: Planetary Geodesy And Gravity (5420, 5714, 6019), Mathematical Geophysics: Inverse Theory, Planetary Sciences: Interiors (8147), Planetology: Solar System Objects: Venus

Scientific paper

We used niching genetic algorithms (NGAs) to invert localized Venus gravity/topography admittance over lowland regions Atalanta and Lavinia Planitiae, as well as volcanic rise Atla Regio for comparison. Assuming both top (topography) and bottom (mantle density anomalies) loads, we calculated theoretical admittance using thin elastic shell models. We inverted admittance for crustal thickness, elastic lithosphere thickness, mantle density anomaly thickness, and ratio (pz) of mantle density anomaly to topographic load. NGA inversion provides an efficient means of finding globally optimal and sub-optimal solutions. Error analyses of all three regions show that pz is a robust estimate; there is significant trade-off between elastic lithosphere and mantle anomaly thicknesses, while crustal thickness is ill-constrained. Optimal models suggest that mantle density anomalies are ~+1 to 2% underlying lowland regions and ~-3 to -4% underlying Atla Regio.

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