Seismic seiches caused by the Alaska earthquake of March 28, 1964, were recorded at more than 850 surface-water gaging stations in North America and at four in Australia. In the United States, including Alaska and Hawaii, 776 of 6,435 gages registered seiches. Nearly all the seismic seiches were recorded at teleseismic distance. This is the first time such far-distant effects have been reported from surface-water bodies in North America. The densest occurrence of seiches was in states bordering the Gulf of Mexico.