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GBF:
Generalized BeamForming, a method for automatically grouping and locating seismic arrivals based on theoretical travel times for a grid of points covering a target area.

Regional events:
Seismic events at distances (from a seismic station) up to about 3000 km are normally termed regional.

Teleseismic events:
Seismic events occuring at distances greater than about 3000 km.

...listening to the Earth

Automatic seismic event locations
Filtered map of latest automatic locations

NORSAR, as operator of the Norwegian National Data Centre (NDC) for the Comprehensive Test-Ban-Treaty (CTBT), publishes three main types of seismic bulletins. A continously updated (delayed about one hour behind real-time) automatic list of seismic events in northern Europe based on the GBF method, a monthly regional reviewed bulletin covering Fennoscandia and surrounding areas, and a monthly reviewed bulletin of teleseismic earthquakes and other seismic events.

An automatic map showing the GBF solutions for Fennoscandia, with some filtering of random noise detections is also available.

Available bulletins

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