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We continue our work towards developing and evaluating a joint seismic/infrasonic bulletin for northern Fennoscandia and adjacent regions. This bulletin would be similar to the automatic seismic bulletin that we are currently providing on the NORSAR Web pages, but it would also contain infrasonic phase associations. Some illustrations of initial results are presented below:
Automatically located events. No infrasound signals were
detected by ARCES and Apatity infrasound arrays.
The above map shows the 651 automatically located events (GBF) during a period of abot one year for which either the ARCES seismic array or the Apatity infrasound array observed infrasound signals. The blue triangles show the GBF event locations and the red stars show the location of known sites with explosions either at the Earth’s surface or in the atmosphere. Note that the automatic GBF locations usually scatter over a larger area around these source regions. Also note that the GBF locations employ a fixed grid, and that many of the grid points shown on the map have a large number of corrsponding events.
Automatically located events. Infrasound signals were
detected by ARCES and Apatity infrasound arrays.
The above map is similar to the previous map, and shows the 68 automatically located events (GBF) for which both the ARCES seismic array and the Apatity infrasound array observed infrasound signals. The blue triangles show the GBF event locations and the red stars show the location of known sites with explosions either at the Earth’s surface or in the atmosphere.
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