ShakeMap Methodology

The ShakeMap triggering and production is based on the Antelope system used for real-time seismic operations at AEIC.
The ShakeMap generation sequence is triggered once a new event above certain magnitude appears in the real-time event database.
The first ShakeMap is automatically generated within 1-2 minutes after that, and then several updates may be automatically issued if new data becomes available from different sources.
Analyst-reviewed ShakeMaps are generated for alarm events after the revision of the automatic solutions, usually within 25 to 45 min of the origin time.
A cancellation script is activated if an updated hypocenter is no longer eligible for ShakeMap.
A final version of ShakeMap is manually produced for larger events, if necessary, in order to utilize any additional information, including extended source geometry.

The ShakeMap triggering and production is based on the Antelope system used for real-time seismic operations at AEIC.