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NNSN Real-time data-acquisition Event detection and Monitoring

NNSN Real-time data-acquisition Event detection and Monitoring. Stations in NNSN. Norwegian National Seismic Network and other seismic stations in Norway. Blue symbols are NNSN stations and red symbols are NORSAR arrays. The station JMIC is operated by NORSAR. SEISLOG configurations.

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NNSN Real-time data-acquisition Event detection and Monitoring

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  1. NNSNReal-time data-acquisitionEvent detection and Monitoring

  2. Stations in NNSN Norwegian National Seismic Network and other seismic stations in Norway. Blue symbols are NNSN stations and red symbols are NORSAR arrays. The station JMIC is operated by NORSAR.

  3. SEISLOG configurations DIGITISER SEISLOG Windows LISS-server GPS Central LINUX system DIGITISER SEISLOG Linux LISS-server SeedLink-server GPS SeedLink-server TCP/IP communication over: ADSL ISDN GPRS(mobile phone lines) SEISLOG Embedded DIGITISER LISS-server GPS

  4. What is LISS • Made for installations and maintenance of the Global Seismic Network and collection and distribution of data produced by these stations. • Sends out live data from the Global Seismic Network • Albuquerque Seismological Lab is part of USGS and responsable • Protocol: one-way only • Data transmitted in standardized MiniSeed format 512 byte blocks. • 32 byte integer, Steim1 or Steim2 compression

  5. What is SEEDLINK • Similar to LISS with extra headers added • Capable of 2 way communication • Retransmission • SEEDLINK server made by GFZ-Potsdam and integrated in their SEISCOMP acquisition system • Used for GEOFON network and others • Data transmitted in standardized MiniSeed format 512 byte blocks. • 32 byte integer, Steim1 or Steim2 compression

  6. Software • All SEISLOG Linux routines are written in C • Software identical for desktop PC, laptop and embedded • Utilities for monitoring and graphics are written as clients communicating with SEISLOG server over sockets • Ringbuffer and event files written in MiniSEED format • SEISAN S-files written in SEISAN data base structure • Waveform data written in SEISAN data base structure • Server function emulates LISS server (transmission of 512 byte MiniSEED blocks over Internet)

  7. TS-7260

  8. SARA recording unit with SEISLOG Linux embedded

  9. Communication for NNSN • Fixed internet (university network), free • Internet with ADSL, cheap • Internet with ISDN, expensive • Internet with mobile phone (3G, Edge or GPRS), medium price

  10. Previous NNSN data collection: SEISNET

  11. NNSN real time system • Data in realtime to data center in Bergen • Improved network monitoring • Central triggering instead of local at station • Should be based on well tested public domain software • Develope new software for real time systems and make it public domain • Use the protocols LISS and/or SEEDlink

  12. NNSN real-time data acquisition Linux station SEISLOG Seedlink server LINUX SERVER Seedlink continous SeedLink Server 24-hour Continous data files Re-transmission Communication with other Seedlink servers. EarthWorm Input data from SeedLink server Triggering Helicorder plots SEISAN Windows station SEISLOG Liss continous Liss continous Embedded Linux Station SEISNET SEISAN DATA-BASE FTP/Telnet

  13. RTNET real time plot Plot uses SEEDLINK as input

  14. RTNET real time plot filtered Raw signals Signals filtered 2-8 Hz

  15. EARTHWORM helicorder plot

  16. NNSN experience • 20 stations from Norway 3 stations from Finland 3 stations from Denmark 4 stations from UK • EARTHWORM has triggered reliably but real time station density is too low to give good coverage in some parts parts of the network • SeedLink server has been very stable • The graphical monitoring of real-time data has been very useful

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