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| Titel |
The Swedish National Seismic Network: real-time processing of data from 60 broadband stations |
| VerfasserIn |
R. Bodvarsson, P. Erlendsson, B. Lund, H. Shomali, A. Tryggvason |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250030030
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| Zusammenfassung |
| The Swedish National Seismic Network (SNSN) has recently finished the
expansion to 60 high-gain broadband seismic stations, covering the entire
country from south to north with a station spacing of approximately 100 km.
During the last year the SNSN has also moved from using segmented data
transferred via dial-up telephone land-lines to continuous data transmission
over broadband mobile telecommunication networks. In this talk we will share
some of our experiences with mobile telecommunication data transfer and then
concentrate on how the data is processed in real-time at the SNSN data center
in Uppsala.
As the data arrives in Uppsala (currently using Guralp's Scream software) it
is placed in a shared memory ring-buffer system. The system not only allows
multiple copies of individual data streams in separate buffers but also
streams of derived data, such as amplitude based energy, data deconvolved
with the instrument response or detections. This buffer system allows easy
access to suitable data for the application software, such as detectors,
location and focal mechanism algorithms. One such application which is
currently running is a magnitude estimator for energy duration magnitudes of
large events. As of today only data from the SNSN stations are processed but
in the near future data from stations in Finland, Denmark and Norway will be
included in order to enhance the regional coverage of the location system.
Additionally, stations from around the globe will be incorporated to allow
fast estimates of location and magnitude of large teleseismic events. |
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