Minor UK Tsunami After Massive sub-Atlantic Slide - 04/07/2011

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A minor tsunami occurred in the last week of June 2011 along the south coast of the United Kingdom. A network of coastal tidal and wave monitoring stations maintained by Southampton-based EMU Limited recorded the progress of the waves beleived to have been caused by a massive underwater landslide in the Atlantic, 200 hundred miles off the Cornish coast. Waves of between 0.5 and 0.8 metres resulted in abnormal tidal records at the Channel Coastal Observatory and Plymouth Coastal Station shore stations.


A massive underwater landslide in the Atlantic 200 miles off the Cornish coast is believed to be the cause of a small tsunami along the south coast, creating waves of between 0.5 and 0.8 metres and resulted in abnormal tidal records at the Channel Coastal Observatory and Plymouth Coastal Observatory shore stations.

 

EMU Limited's principal MetOcean scientist, Mr Robin Newman, initially thought there was a malfunction with the oceanographic instruments, installed for the Southeast and Southwest Regional Coastal Monitoring Programmes, due to the unusual data patterns recorded by the Etrometa Step Gauges and Rosemount WaveRex Radars.

 

"There was a significant amount of variation in the observed data against what would be expected so I checked at multiple sites and they were all consistent with some sort of movement from east to west," Mr Newman said. "We subsequently realised we had recorded what appears to be a minor tsunami."

 

"While 0.8 metres waves may not sound like much, it could have caused flooding events if combined with high tides," he said. "Tsunamis are not expected to affect the UK so this is a very rare event. But from this week's experience, they can, but also we can now say we have an operational system which can detect these unusual events."

 

EMU Limited will monitor the continuing wave movements as these may be a form of standing-wave oscillation, or seiching, in the Channel.

 

Last updated: 16/10/2018