Abstract
Synopsis A total force magnetic survey has been made of an offshore area (14 km × 12 km) near Lerwick, Shetland Isles, where the Admiralty Chart shows an anomaly in the magnetic variation. The survey shows a strong positive anomaly, suggestive of a basic rock magnetised in a direction close to that of the present Earth’s field. A block model has been fitted to the total force field, and the computed anomaly in magnetic variation agrees with that shown on the chart. Steep magnetic gradients and irregular sea-floor topography suggest that the body may outcrop on the sea floor and could be sampled by dredging. The nature of the body is discussed; it is thought that it may be a pre-Middle Devonian intrusion.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
