[A1] Gravity Anomaly Maps

Scope and Content
Three large maps: 1. Orkney Sheet 59 degrees North - 04 degrees West; Institute of Geological Sciences; 1:250 000 Series; Bouguer Gravity Anomaly Map (Provisional Edition), Copyright N.E.R.C. 1980. Area covered Orkney Mainland and North Isles 2. Caithness Sheet 58 degrees North - 04 degrees West; Institute of Geological Sciences; 1:250 000 Series; Bouguer Gravity Anomaly Map (Provisional Edition), Crown Copyright 1977. Area covered North Caithness, Orkney Mainland and South Isles 3. Caithness Sheet 58 degrees North - 04 degrees West; Institute of Geological Sciences; 1:250 000 Series; Aeromagnetic Anomaly Map. Crown Copyright 1978. Area covered North Caithness, Orkney Mainland and South Isles.
Administrative / Biographical History
A gravity anomaly is the difference between the observed acceleration of a planet's gravity and a value predicted from a model. A location with a positive anomaly exhibits more gravity than predicted, while a negative anomaly exhibits a lower value than predicted. The anomaly is the body or effect that causes the deviation from the "ideal" gravity model. Many data corrections must be made to the measured gravity value in order to extract the response of the local anomaly, or local geology, which is typically the goal of applied geophysics. (Wikipedia)

Scope and Content