Free air gravity anomalies derived from radar altimetric determinations of geoid height milligals.
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Transcript of Free air gravity anomalies derived from radar altimetric determinations of geoid height milligals.
Deflection vrs x, for vertical line load on infinite plate and half plate
Distance, x/a (a = flexural parameter
( )m w
W
Fgaρ ρ
Δ
⎡ ⎤⎢ ⎥−⎣ ⎦
deflection,
Half plate, vertical line load on edge
Infinite plate, vertical line load at x =0
3/4
/2
1 2 3 4 502.0
1.6
1.2
0.8
0.4
0
-0.4
Outer (oceanic side) slope of trenches associated with subduction zones
elastic plate model elastic-plastic model
Outer (oceanic side) slope of trenches associated with subduction zones
elastic plate model elastic-plastic model
strain
stre
ss
plastic
elas
tic
Venus Gravity, Topograph
y and Geoid
High correlation between gravity and topography
Anomaly amplitude similar to Earth
Data from Magellan spacecraft, Images from Wieczorek, 2006
Mars Gravity & Topography Maps
Free air gravity anomaly from Mars Global Surveyor (MGS)
Mars topography from MOLA on MGS
• Total amplitude of anomaly larger than on Earth Why?
Elysium volcano
Isidis impact crater
•From Goddard Space Flight Center Gravity maps
Gravity anomalies
from Martian features
LunarGravity & Topography Maps
Gravity data from lunar nearside from Lunar Prospector (Sugano and Heki, 2004)
Topography data from Clementine
• Again total amplitude of free-air anomaly larger than on Earth
Global map from Knopoliv et al., 1998