The isostatic residual gravity anomaly map of Canada shows variations in the gravity field caused by lateral variations ln the density of the Earth's crust and upper mantle that reflect variations in composition and thickness. Systematic gravity mapping began in Canada in 1944 and is ongoing. All data are tied to the International Gravity Standardization Network 1971. Local gravity anomalies result from the juxtaposition of relatively high- and low-density rock types. Shorter wavelength anomalies, representing nearer surface density contrasts, are enhanced by removing the calculated affects of the isostatic roots that support topographic loads.

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The horizontal gradient of gravity anomalies map of Canada shows variations in the gravity field caused by lateral variations in the density of Earth's crust and upper mantle that reflect differences in composition and thickness. Systematic gravity mapping began in Canada in 1944 and is ongoing. All Canadian gravity data are tied to the International Gravity Standardization Network 1971 (IGSN71) to create a coherent dataset at the global scale. Local gravity anomalies result from the juxtaposition of relatively high- and low-density rock types. The horizontal gradient achieves local maxima over or near contacts between rock units with different density.

The observed gravity map of Canada shows variations in the gravity field largely caused by the shape and rotation of the Earth. Systematic gravity mapping in Canada began in 1944 and is ongoing. All Canadian gravity data are tied to the International Gravity Standardization Network 1971 (IGSN71) to create a coherent dataset at the global scale.

The gravity anomaly map of Canada shows variations in the gravity field caused by lateral variations in the density of Earth's crust and upper mantle that reflect differences in composition and thickness. Systematic gravity mapping began in Canada in 1944 and is ongoing. All Canadian gravity data are tied to the International Gravity Standardization Network 1971 (IGSN71) to create a coherent dataset at the global scale. Local gravity anomalies result from the juxtaposition of relatively high- and low-density rock types. Longer wavelength anomalies such as the gravity low over the Cordillera and the relative gravity high over oceanic crust largely reflect variations in the thickness of the crust.