Canadian Absolute Gravity Program: Applications in geodesy and geodynamics



The vast distances, poor accessibility and need for uniform accuracy in the Canadian Gravity Standardization Network (CGSN) have required that stations be connected by numerous interlocking gravity ties involving expensive air transportation of relative gravimeters. It is expected that the introduction of regular high-accuracy absolute gravity measurements into the Canadian network will ensure that the accuracy of the network is sufficient to meet modern geodetic requirements and will render a selected number of stations suitable for geodynamic studies.

As the first step in providing the required absolute measurements, the Geological Survey of Canada has acquired an absolute gravimeter of the direct free-fall type developed by the Joint Institute for Laboratory Astrophysics (JILA), National Institute of Standards and Technology and University of Colorado, Boulder [Faller et al, 1979, 1983].