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BGS UK Repeat Station Programme

Shanahan, Tom; Macmillan, Susan. 2007 BGS UK Repeat Station Programme. [Poster] In: European Repeat Station Workshop, Bucharest, Romania, 14-16 May 2007. (Unpublished)

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Abstract/Summary

The UK repeat station network consists of 51 absolute sites that are re-occupied with period of 4-5 years. Measurements are carried out by a single person between the months of May to September; typically three stations are covered in one week. The stations are distributed evenly over the UK with an average spacing of about 75 km. This spatial distribution is more than sufficient for modelling the main-field which is typically concerned with wavelengths much larger than this [1]. From permanent magnetic observatory observations, it can be seen that secular variation varies significantly over the length of the UK (Figure 2). Repeat station measurements allow a more complete measure of this variation to be modelled throughout the UK. The general procedures for making repeat station measurements, current instrumentation, data processing and recent results are discussed. When the UK repeat station programme was setup, the locations of the sties were carefully chosen with similar selection criteria as would be for a magnetic observatory, i.e., low gradients and well removed from possible sources of magnetic contamination. However, due to the relatively small area of the UK, the use of the land can often change and in recent years this has presented a number of obstacles when occupying repeat sation sites - often resulting in re-location of the site. On average, one repeat station site per year has to be relocated due to this type of problem.

Item Type: Publication - Conference Item (Poster)
Programmes: BGS Programmes > Seismology and Geomagnetism
NORA Subject Terms: Earth Sciences
Date made live: 26 Oct 2012 08:53
URI: http://nora.nerc.ac.uk/id/eprint/20106

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