THE United States Coast and Geodetic Survey, in co-operation with Science Service and the Jesuit Seismological Association, has received instrumental reports concerning an earthquake on December 26 from the observatories at St. Louis, Georgetown, San Juan, Tucson, Fordham, Philadelphia, Des Moines and Huancayo. From this data it appears that the earthquake originated at approximately 12h. 31.8m. U.T. from an epicentre near latitude 9.0° N., longitude 75.0°W. This is in Colombia, South America, near the confluence of the Cauca and Magdalena Rivers. Earthquakes are not uncommon in this region.