Gravity anomalies

Historical exploration has highlighted the Fischell s Brook salt/potash prospect as a possible analog to the Sussex deposits in southern New Brunswick. The prospect is located approximately 15 kilometres south of the Town of St. George adjacent to and underlying the Trans-Canada Highway. The deposit is associated with a gravity anomaly that is approximately 10.5 x 8.5... 

Seismic experiments124 indicate that today the Moon must be solid down to a depth of 800 km, but they also suggest a small molten core. The positive gravity anomalies found for the circular maria also require a thick, solid lunar crust or mantle. If the whole Moon had a homogeneous distribution of radio-... 

Note that, in reality, the density is always positive. However, in geophysical applications we usually consider an anomalous density distribution which can be both positive and negative. In this case, the model of two spherical layers described above can generate a zero gravity anomaly. 

Bentley CR (1983) Crustal structure of Antarctica from geophysical evidence a review. In Oliver RL, James PR, Jago JB (eds) Antarctic earth science. Australian Academy of Science, Canberra, ACT, Australia, pp 491-497 Bentley CR, Robertson JD (1982) Isostatic gravity anomalies in West Antarctica. In Craddock C (ed) Antarctic geoscience. University of Wisconsin Press, Madison, Wl, pp 949-954 Bentley CR, Robertson JD, Greischar LL (1982) Isostatic gravity anomalies on the Ross Ice Shelf. In Craddock C (ed) Antarctic geoscience. University of Wisconsin Press, Madison, Wl, pp 1077-1081... 

The results summarized by Bentley (1983) in Eig. 15.10 are based on gravity anomalies pnblished by Groushinsky and Sazhina (1982). The diagram indicates that the thickness of the subglacial crust of... 

Fig. 15.11 This cross-section of the crust of West and East Antarctica was drawn along line A-B in Fig. 15.10 using the contours of crustal thickness of a diagram by Bentley (1983). The profile of crustal thickness indicates the depth to the Mohorovicic Discontinuity (Moho) which separates the continental crust of Antarctica from the lithospheric mantle below. This cross-section demonstrates that the crust of West Antarctica is thinner than the crust of East Antarctica and that the transition is abrupt which suggests the presence of a fault zone or suture. The vertical exaggeration is 40x. The crustal thicknesses were derived from gravity anomalies by Groushinsky and Sazhina (1982)...

The presence of a meteorite impact crater at 71.5°S and 140°E in Wilkes Land was first suggested by Schmidt (1962) as a potential source of tektites in Australia called australites based on the presence of a negative gravity anomaly that was recorded by the Victoria Land Traverse-2 in 1958/59. The presence of a meteorite impact crater in WUkes Land was supported by Weihaupt (1961,1976) on the basis of a seismic survey which indicated that the elevation of the bedrock surface at the site of the hypothetical crater is 415... 

Fig. 18.7 The Wilkes Land subgladal meteorite-impact crater was identified on the basis of gravity data obtained by the GRACE sateUite (Gravity Recovery and Climate Experiment). The location of the crater is indicated by a positive free-air gravity anomaly which occurs above a subglacial basin at 70°S and 120°E outlined by the solid white lines which delineate the rim of the crater. The dashed lines outline the hypothetical outer rings of this multi-ring basin. The coincidence of a positive gravity anomaly over a deep...

Li Y et al. 2005. Isostatic gravity anomalies in the Longmen Mountains and their constraints on the crustal uplift below the mountains on the eastern margin of the Qinghai-Tibet Plateau. Geological Bulletin of China, 24(12) 1162-1168. 

Observed gravity data, different kinds of point gravity anomalies, anomalies averaged over certain geographical cells, and other gravity-related data are nowadays avail-... 

FIGURE10 Map offree-air gravity anomalies in Canadian Rocky Mountains. 

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