Transmission of microseisms across North America and the western North Atlantic

A comparison of microseisms recorded at Bermuda and North American stations indicates that the North Atlantic between the continent and Bermuda has a relatively high absorption rate for microseisms having periods of ten seconds or less. If the source area is on the margin of the continent and the period on the continent is 6.5 to nine seconds, energy absorption over a 1000‐km oceanic path is probably at least an order greater than over an equal continental path, and absorption rates of the longer periods are relatively less. The oceanic passage is accompanied by a slight increase in period. All four‐ to five‐second microseisms recognizable on the Bermuda Milne‐Shaw records are believed to have local sources.