EPOS-N - European Plate Observing System
Seismometers / vault construction
Stations: Upgrade/install notes
Ideas for improvements
Installation / Inventory
Last update: February 17, 2020, at 01:26 PM
EPOS-N: BJØRNØYA SMALL APERTURE ARRAY
There is 20-30 dB difference1) in SNR (signal/noise ratio) on existing Bjørnøya seismometer (BJO1) compared to a relatively quiet site in mainland Norway (SKAR), as seen from PDF plots below. In order to detect weaker earthquakes in the region near Bjørnøya, additional sensors in an array configuration are required. To achieve 20 dB better SNR, the number of sensors must be increased by 100 (since 10*log(100) = 20 dB) which is clearly unrealistic. An array of 9 elements would increase SNR by 10*log(9) = 9.5 dB.
Bjørnøya seismometer (BJO1) PDF (Power Density Function) plots. Click to enlarge.
SKAR (mainland Norway) seismometer PDF (Power Density Function) plots. Click to enlarge.
1) Credits B.O.Ruud for discussions on this subject.