The US Geological Survey Earthquake Hazards Web site contains the Earthquake Notification Services page and service. Users can subscribe to three email lists that include BIGQUAKE -- which sends a message whenever an earthquake with a magnitude of 5.5 or greater occurs anywhere in the world or a magnitude of 4.5 or greater occurs within the 50 US states -- and QEDPOST -- which sends a daily message of the earthquakes located 7 days prior to the current day -- and MTALL -- which sends a message that contains the estimate of the seismic moment tensor for earthquakes with either a body-wave magnitude or surface wave magnitude of 5.5 or greater. Seismologists and other related professionals will appreciate being able to stay abreast of the latest tectonic activity with this helpful tool.