USGS Note: This should not be considered to be a complete map of all events of magnitude 4.0 or greater. Also we may not rapidly locate earthquakes smaller than 5.0 outside the US unless they have caused significant damage or are widely felt. Earthquakes occurring outside the US and smaller than about magnitude 4.5 can be difficult for us to locate if there are not enough data.
We continue to receive data from observatories throughout the world for several months after the events occur. Using those data, we add new events and revise existing events in later publications.
For a description of these later publications and the available data, see here: Scientific Data