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dipolar magnetic fluctuation is grouped with these remains measuring 29nT. It is possible that this is the remains of decommissioned cable in the region.


1.2.16 Seafloor Disturbances 85.


There are 4 seafloor disturbances recorded in the East Anglia THREE site (70871, 76080, 76082 and 76112). A seafloor disturbance is an area of seabed that appears disturbed, potentially by a buried or partially buried wreck or debris of archaeological interest. These types of features may be groups of what is apparently debris or may be more ephemeral and consist solely of a patch of bright and dark reflectors distinct from the surrounding seabed. The features vary in size from 7.5m x 1.6m x 0.6m (76080) up to 32.9m x 7.2m x 0.5m (76112). They generally are made up of multiple dark and bright reflectors, hard edged and diffuse anomalies that look anomalous and are spread across the seabed. None of the recorded seafloor disturbances have associated magnetic anomalies.


1.2.17 Magnetic Anomalies 86.


Two hundred and seventeen (217) isolated magnetic anomalies have been recorded across the East Anglia THREE survey area in total with any anomalies identified measuring over 5nT tagged as potential archaeological remains. The picking of the magnetic targets across the East Anglia THREE survey area was made difficult due to the composite geological nature of the site. The huge number of large and highly mobile sand waves creates large variations in the magnetometer data and as a result individual potential targets of possible archaeological potential are difficult to differentiate or can be masked by the fluctuations caused by the natural geology. Similarly, any linear trends interpreted to be recorded and unrecorded cables and pipelines have also been excluded from the interpretation.


87.


The smallest magnetic anomalies tagged measure just 6nT (76386; 70937 and 70938). All of these are isolated, weak magnetic anomalies with no corresponding geophysical anomalies present. The latter two anomalies were identified and classified as A2’s in the ZEA phase of works but not picked by WA in the most recent magnetometer data as they were located within the noise limits of the dataset. These are all potential buried ferrous debris remains.


88.


The largest magnetic anomalies identified across East Anglia THREE are associated with wreck remains as described above (71012 and 71020). 70872 is a very large isolated magnetic dipole anomaly identified in the north western corner of East Anglia THREE. This area of the seabed has frequent magnetic fluctuations and noise caused by the large and frequent sand waves, however given its high magnetic value


Preliminary Environmental Information May 2014 East Anglia THREE Offshore Windfarm Appendix 17.2 Archaeological Review of


Geophysical and Geotechnical Data: Technical Report


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