Japanese tsunami affected Norwegian fjords
The Geirangerfjord in Norway
Frédéric de Goldschmidt
In a strange example of how the world's oceans are interconnected, a recent Norwegian study highlights how the effects of the earthquake and tsunami in Japan in March 2011 was seen and recorded by observers in Norwegian fjords. The tsunami sent waves trains out worldwide and when these wave trains impacted Norwegian fjords, they caused local five foot waves to slosh through the fjords about one a minute for several hours (some of this was caught on video). These waves, technically called "seiches" by scientists, began transiting the fjords about 30 minutes after the Japanese earthquake. The fjords were perfectly aligned to pick up the wave energy from the tsunami and "amplify" it to create the series of seiches. This incident underlines the idea that the world's salt water is not a static pond but an interconnected series of currents and waves and tides, always in motion. Make sure your depth sounder is well calibrated and trust it before you trust the depths shown on a chart!
More on this story here.