Earthquake affects shipping safety

OpenSeaMap - the free nautical chart

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GPS monitoring stations in Japan will have to undergo comprehensive recalibration following the devastating earthquake after measurements showed that the nation’s coastline shifted by as much as 4 metres in the quake. The country’s Geonet network of approximately 1,200 GPS monitoring stations have measured a significant displacement following the quake.

 

Displacement

Displacement

 

Shipping maps linking GPS readings to maps – e.g. navigation to a shallow shore – would all need to be realigned as a result of the movement of the earth.  For ships, the nautical charts will need revision due to changed water depths,  (of about 3 feet). Much of the coastline dropped by a few feet.

http://www.gpsworld.com/survey/news/gps-shows-dramatic-position-shifts-japan-earthquake-11212

 

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