Gravity measurements have been made over many years by DIAS (e.g. Thirlaway 1951, Murphy 1952, 1974; , O’Reilly et al., 1996, Readman et al., 1997). There is more than 23,000 stations in total. The data coverage shown averages at about 4.2 stations per 10 km square, equivalent to an average spacing of about 1.55 km. … Continue reading Gravity Data