The analysis of earthquakes is in constant flux. As new information and/or technology becomes available, seismic data maybe enhanced or revised.

Preliminary data is just that, preliminary data. While automated analysis systems are very quick and make excellent approximations of events, they are not sufficiently accurate enough just yet to make final seismic results. The benefit of these systems, however, is extraordinary because the will alert people when an earthquake has occurred even, though the data is preliminary.

Remember, Seismo-Watch EQ Flash! Earthquake Alert Bulletins are preliminary data and should not be considered the final result.

Better approximations of the earthquake perimeters comes after review by a trained person in seismic data analysis, usually a geophysicist or seismologist. As new data is analyzed, either within minutes, hours, or days, of the event, the results may change and if posted, another e-mail alert bulletin is issued.

Seismo-Watch EQ Flash! Earthquake Alert Bulletin system scans multiple seismic monitoring networks from around the world several times an hour. As the seismic data is processed at these networks, it is retrieved and sent out as an Earthquake Alert Bulletin. Our system is configured to notice when the data has been significanly changed or modified, and if that criteria is met, an aditional alert bulletin is issued. This will give you a better understanding of the true seismic activity.

Also, some seismic networks over lap, such as U.S. Geological Survey, Menlo Park, CA and the University of Nevada, Reno, Seismological Laboratory. We have eliminated much of the duplicate messages from these overlaps. If an neighboring network produces a result with a significant change, another bulletin may be issued.

Keys to watching for duplicate messages for single events are:

  • Similar Earthquake Alert Bulletin Numbers.
  • Notice the seismic network(s) issuing the data.
  • Notice the time of the event and compare it with previous messages.

Go to the seismic data lists from the effected region from the Seismo-Watch Regional Activity pages.

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