Abstract:
(Adapted from NEIC Earthquake Notification Services web page)
The United States Geological Survey's National Earthquake Information Center
(USGS/NEIC) offers products and services related to earthquakes and seismicity.
The NEIC offers a notification service called BIGQUAKE. Subscribers to
BIGQUAKE can receive a message whenever an earthquake is reviewed by the duty
geophysicist that has a
... magnitude of 5.5 or greater anywhere in the world or a
magnitude of 4.5 or greater within the 50 US states,excluding the Aleutian
Islands of Alaska. The speed of review is somewhat variable, but in most cases
a magnitude 6.5 or greater event anywhere in the world or a magnitude 4.5 or
greater event within the contiguous US is reviewed within a few hours of its
occurrence. Other events meeting the big quake criteria are reviewed within one
or two days. The subject line of each big quake message contains key earthquake
parameters so that pagers and cell phones may be used to receive these
messages.
Subscribers to QEDPOST can receive a daily message of the earthquakes located 7
days behind the current day taken from their Quick Epicenter Determinations
(QED) listing. It is a preliminary publication and typically contains 10-30
events per day.
Subscribers to MTALL can receive a message that contains the estimate of the
seismic moment tensor for earthquakes with either a body-wave magnitude (mb) or
surface-wave magnitude (MS) of 5.5 or greater. 
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