Global Network - Digital Telemetry for Seismic Applications

Posted on December 5th, 2016 by vapro

REF TEK is the supplier to the University of California, San Diego for the IDA program, which is a major portion of the IRIS/GSN program.

REF TEK started supplying digital telemetry for seismic applications in 1981, when it was approached by UCSD to supply digital telemetry for the ANZA Network, the first such network in the USA. Since then, REF TEK has been supplying error-corrected digital telemetry for regional and national networks for research and public safety purposes worldwide. Until very recently, REF TEK has been the only commercial supplier of error-corrected digital telemetry. Now most investigators understand the problems introduced in processing by bit errors, including finding automatic phase picks.

The Southern Great Basin Seismic Network (SGBSN) is a large 42 station network that monitors seismicity around the Yucca Mountain, Nevada large nuclear waste disposal area. It is operated by the University of Nevada, Reno. The geometrical concept for this network has been to deploy radio telemetry subnets with nodes (or hubs) that then forward the data to Reno via microwave. At Reno, the acquisition and processing is accomplished on SPARC workstations. Originally, when part of the network was first deployed by the US Geological Survey, the nodes transmitted via satellite (VSAT) to the USGS National Earthquake Information Center in Golden, Colorado. This network emphasizes three relevant aspects: the hub concept, the use of a UNIX workstation in communication and acquisition, and satellite communication.

The Geological Survey of Japan (GSJ) Network is a 16-station network deployed around the Kobe area to record aftershock seismicity. The communication vehicle is ISDN digital lines, and the processing is on UNIX workstations. Although, this network uses computer interfaces with REF TEK DAS units, it nevertheless demonstrates the use of REF TEK instruments with links other than narrow band, voice-grade phone lines or radios and the use of workstations for communication and acquisition.

The table below is a list of digital telemetry networks supplied by REF TEK.

REF TEK’s innovation in network technology, the Advanced Seismic Networks approach, offers customers telemetry stations and networks for a variety of communications media including IP networks, satellite and radio telemetry, analog and digital lines. The two most recent installations in Table 1 utilize the Advanced Seismic Networks approach.

Digital Telemetry Networks Supplied By REF TEK

DateDescription of NetworkOrganization Operating NetworkCommunication Media
1981ANZA NetworkUniversity of California, San Diego, Scripps InstitutionUHF, Microwave
1983Four networks in ItalyISMES, BergamoUHF
1985Parkfield High Frequency ArrayUniversity of California, BerkeleyUHF
1986Portable Telemetry ArrayUniversity of California, Lawrence Livermore LaboratoryUHF
1987Parkfield Early Warning NetworkUS Geological Survey, Menlo ParkUHF
1987The Geysers NetworkUniversity of California, Lawrence Berkeley Laboratory/US Geological SurveyUHF
1987Parkfield Differential Ground Motion ArrayUS Geological Survey, Menlo ParkCable Telemetry
1988Perry Nuclear Power Plant NetworkCleveland Electric IlluminatingUHF
1988IDA (International Deployment of Accelerometers)University of California, San Diego, Scripps InstitutionGlobal Dial-up
1989SMU Deployable ArraySouthern Methodist UniversityUHF
1990Kyrgyz Telemetry NetworkUS/Russia Joint Seismic ProgramUHF (now upgraded to spread spectrum radio)
1990Kyrgyz Dense Telemetered ArrayUS/Russia Joint Seismic ProgramUHF (now upgraded to spread spectrum radio)
1992Southern Great Basin NetworkUniversity of Nevada, RenoUHF, VSAT
1994Virginia NetworkVirginia Polytechnic Institute (Virginia Tech)UHF
1994Nuevo Cuyo NetworkINPRES, ArgentinaVHF/UHF, dial-up
1995Southern Great Basin NetworkUniversity of Nevada, Reno (additional stations)UHF, VSAT
1995Chile NetworkUniversity of ChileUHF
1996Kuwait National NetworkKuwait Institute for Scientific Research (KISR)UHF
1996Nor-Oeste ArgentinoINPRES, ArgentinaVHF/UHF, dial-up
1996Kobe NetworkGeological Survey of JapanISDN
1997Friuli NetworkInstituto Nazionale de Geofisico/Civil Protection, ItalyDial-up
1997Thailand National Telemetry NetworkThailand Meteorological Dept.VSAT, Dial-up
1997Kobe NetworkGeological Survey of Japan (expansion)ISDN
1997San Calixto, Bolivia NetworkSan Calixto ObservatoryUHF
1998Puerto Rico National Telemetry NetworkUniversity of Puerto Rico, MayaguezUHF, microwave, ISDN
1998Tsunami Warning NetworkUS Geological Survey, Golden, ColoradoUHF
1999New Delhi Telemetry NetworkIndia Meteorological Department, Delhi, IndiaVSAT
2000Seismographic Aftershock Monitoring System (SAMS)Test Ban MonitoringSpread Spectrum radio
2000Small Aperture Infrasound arrayFederal Institute for Geosciences and Natural Resources, BGR (Bundesanstalt fuer Geowissenschaften und Rohstoffe), Hannover, GermanyGSM
2002Seismograph Telemetry Network around EdinburghBritish Geological SurveyUHF
2004Seismic Telemetry NetworkInstitute of Physics of the Earth (IPE), Masaryk University, Brno, Czech RepublicSpread Spectrum Radio
2005National Operative Telemetry System for Seismological Information (NOTSSI)Geophysical Institute Bulgarian Academy of Sciences, Sofia, BulgariaISDN, VPN, MAN
2006DAM monitoring systemEDELCA,VenezuelaSpread Spectrum Radio
2006German Indonesian Tsunami Early Warning SystemGeoForschungsZentrum Potsdam (GFZ)Global VSAT communication
2007Dam Monitoring Telemetry networkTheri Hydro Dam Corporation, IndiaSpread Spectrum Radio
2008Zaragoza Bridge Monitoring systemDireccion General de Obras Publicas del D.F. & Terracon, Mexico City, MexicoSpread Spectrum Radio
2009Jordan National Seismic Telemetry networkJordan Seismological Observatory (JSO), Amman, JordanVSAT
2010Telemetry network in North-East of India (in progress)India Meteorological Department (IMD), New Delhi, IndiaVSAT
2012Aswan Dam Strong-Motion Array (in progress)National Research Institute of Astronomy and Geophysics (NRIAG)GSM

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