Integrated Seismic and GNSS Network (ISGN)

Establishment of Integrated Seismic and GNSS Network (ISGN) is an initiative of Earth System Sciences Organization (ESSO), Ministry of Earth Sciences (MoES), Under this project, standalone seismic and GPS/GNSS receiver stations (provided by MoES to different National institutions through its various programmes) as well as Regional seismic data Centres of our country are integrated through satellite and terrestrial links with data centres established at Indian National Centre for Ocean Information Services (INCOIS) Hyderabad, and India Meteorological Department(IMD), New Delhi. Thus, a National central pool is created for real time acquisition of seismic and GPS data, real time processing, data sharing, storing &archival and earth quake/alert information to general public.

INCOIS, as nodal agency, has established the network.

The major objective of the project is to get more accurate earthquake parameters for National Tsunami Early Warning System(at INCOIS), mapping of earthquake Hazard and facilitate sharing of data to scientific researchers, among Regional/ National Seismic centers and dissemination of the data to general public in India. The major contributing institutes/organizations of the project at present are (1) Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, (2) Indian Meteorological Department (IMD), New Delhi, (3) National Geophysical Research Institute (NGRI), Hyderabad, (4)Institute of Seismological Research (ISR), Gandhinagar, (5) North East Institute of Science and Technology (NEIST), Jorhat. (6) Principal Investigators (PI) of different institutions /universities: Kumaun University, Nainital, Indian Institute of Science, Bangalore, Indian School of Mines University, Dhanbad, University of Kashmir, Hazratbal, Srinagar, Manipur University, Imphal, Indian Institute of Technology Kharagpur, Indian Institute of Geomagnetism, Mumbai, Kashmir University, Srinagar, Snow and Avalanche Study Establishment (SASE), Chandigarh, Tezpur University, Tezpur, G.B.Pant Institute of Himalayan Environment and Development, Almora, Indian Institute of Astrophysics, Bangalore.

Features of the network

Satellite link connectivity to the standalone seismic and GPS/GNSS receiver stations, operated by different PIs (Principal Investigators) belonging to different institutions/Universities, is provided through VSAT (Very Small Aperture Terminal) with 1.2m/1.8m antenna. The stations are spread across Indian mainland and Andaman &Nicobar Islands.

The seismic and GPS/GNSS data is critical for disaster management. The network is designed with two satellites for satellite redundancy such that half of number geographically distributed standalone stations are connected through GSAT-12 to a 9.0 Hub established at INCOIS and the other half is connected through INSAT 3A to an another 9.0m Hub station, established at NCMRWF(National Centre for Medium Range Weather Forecasting),Noida. Terrestrial connectivity through high bandwidth MPLS (Multiprotocol Label Switching) is provided between INCOIS &IMD and between IMD and Noida. Also, the regional seismic data centres of NGRI, ISR, and NEIST are connected with terrestrial MPLS link for data exchange with INCOIS and IMD.

The data centre at INCOIS and IMD act mirror to each other. Also each data centre is scalable to handle more number of stations (up to 500 No.). The Data centre is capable of handling multiple requests at a time using a concept called Global Load Balancing which distribute the workloads across the two data centres INCOIS, Hyderabad & IMD, New Delhi. This could be achieved by routing the traffic to the geographically nearest data centre or best-performing data centre. This will in turn ensure the high availability of the application.

The web application allows users to select seismic or GNSS stations data for chosen time period or else user can select from a catalog of earthquake events for which continuous data will be made available. This request for data is logged in and user will be provided with credentials for logging into FTP site, from where the requested data can be downloaded. The real-time continuous data plots for the past 24 hrs and displacements from GNSS stations are also made available on web for immediate verification of data availability.

The continuous real-time data is made available to the Regional Centres and Principle Investigators (PIs) using seedlink server for seismic data and Ntripcastor for GNSS data.

Also, the site provides earthquake information to general public.

Data users are kindly asked to refer to the data contributors in any publication using data from ISGN.

The project is executed through M/s Nelco Limited for satellite link connectivity, M/s BSNL (Bharat Sanchar Nigam Limited) for terrestrial link connectivity and M/s TCS (Tata Consultancy Services Ltd )for development of capabilities for acquisition , processing, storage , archival of seismic & GPS/GNSS data and development of Web portal.