Refraction of Microseisms at Island Stations

Refraction diagrams for 6-s microseisms are drawn for the island of Bermuda. It is assumed that the waves are surface waves between the ocean and the sea bed of the type first described by Stoneley, so that the shallower the water the greater the wave velocity. The diagrams show that the effect of refraction on the energy of the incident waves is very marked, particularly for waves approaching from the N-E and S-W quadrants. This effect explains some of the anomalies that have been found at Bermuda.