THE United States Coast and Geodetic Survey, in co-operation with Science Service and the Jesuit Seismological Association, on the basis of reports from fourteen seismograph stations, has found the epicentre of the earthquake of March 15, 1941, at 5h. 46-3m. G.M.T. to be provisionally at latitude 28-l°N., longitude 113-6° W. This is south-west of Oalmalli and towards the northern end of the Vizcaino Desert, in an established seismic region.