The map is centered at 300 deg W to show the continuity of the dichotomy boundary. Bouguer gravity anomalies are shown on a map of Noachian, Hesperian, and Amazonian age terrains, simplified from current geologic maps. In this field the dichotomy boundary in eastern Mars lies mostly at -1 to -2 km elevation. The spherical harmonic topography used has zero mean elevation, and differs from the USGS maps by about 2 km. Zuber, Maria T.įree-air and Bouguer gravity anomalies from a 50x50 field, derived from re-analysis of Viking Orbiter and Mariner 9 tracking data and using a 50x50 expansion of the current Mars topography and the GSFC degree 50 geoid as the equipotential reference surface, with the Martian crustal dichotomy are compared. The free air gravity anomalies mostly mimic the seabed configuration and at times, the deviation observed in the free air.įree-air and Bouguer gravity anomalies and the Martian crustal dichotomyįrey, Herbert Bills, Bruce G. We generally deal with free air gravity anomalies in oceans. will undertake either regional, reconnaissance or detail gravity surveys. Interpretation of free-air gravity anomaly data for determining the crustal structure across the continental margins and aseismic ridges: Some examples from Indian continental margins and deep-sea basinsĭigital Repository Service at National Institute of Oceanography (India)Ĭontent-Type text/plain charset=UTF-8 202 Interpretation of free-air gravity anomaly data for determining the crustal structure across the continental margins and aseismic ridges: Some examples from Indian continental margins and deep.
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