Advertisement

H

  • Jan Dirk Blom
Chapter

Abstract

Also known as hafgerdingar effect. Hafgerdingar is Norse for ‘sea hedges’ or ‘sea fences’. The term denotes a circular *physical illusion depicting a giant wave similar to those occasionally reported in Polar sea regions. The term hafgerdingar stems from a 13th-century manuscript called the King’s Mirror, which contains descriptions of Iceland, Ireland, and Greenland. For a long time it was believed that in this medieval text the term hafgerdingar refers to a circular tidal wave or a single rogue wave occurring at open sea, caused by a submarine earthquake or a capsizing iceberg, and actually capable of putting a ship in grave peril. However, a re-examination of the hafgerdingar’s original description indicates that the phenomenon in question may well have been a *superior mirage or *fata morgana. In the Polar region such physical illusions can appear to the observer as a huge wall of waves surrounding one’s ship, with an apparent height of 30 m or more.

Keywords

Visual Hallucination Auditory Hallucination Greek Word Tactile Hallucination Charles Bonnet Syndrome 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Jan Dirk Blom
    • 1
  1. 1.Parnassia Bavo Group & University of GroningenThe HagueThe Netherlands

Personalised recommendations