Earthquake affects shipping safety

OpenSeaMap - the free nautical chart

Image via Wikipedia

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.





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.


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