China Gravity Basic Net 1985

Abstract

The China Gravity Basic Net 1985 (CGBN85) which comprises 57 gravity stations, including 6 absolute gravity stations, was measured with LaCoste & Romberg gravimeter model G (LCR-G). Precise relative connections were also made between CGBN85 and several existing international standards. A whole adjustment was made by applying the parameter adjustment method, taking scale functions for each LCR-G meter into account. The nationwide new CGBN85 with an average internal accuracy ±8μGal [10~(-8)ms~(-2)] was then established and has been used, since its official appraisal, in gravimetric practices for two years. This shows that CGBN85 meets the requirements of modern earth sciences.