IMD, at present is maintaining a network of 51 seismological observatories. During 1996-99, twenty-four seismological observatories were upgraded with broadband digital seismographs.. A Central Receiving Station (CRS ) and a National Seismological Data Base Centre (NSDC) have been established at New Delhi to receive analyze and systematically archive the seismic data. In operational mode, the center is responsible for quick determination of earthquake parameters and dissemination to various user agencies. During 2000-2002, a 16-element VSAT based digital telemetry seismograph station network with a central receiving station at New Delhi, was established in and around Delhi for monitoring of seismicity of the region. The continuous ground motion data from the field stations is received at CRS in real time mode through VSAT based communication system.

Research in Pure and Applied Seismology

Research in fundamental and applied seismology is a part of the activities of the Seismology Division. Special studies of important earthquakes which occur in and near India are also taken up.

Responding to queries relating to earthquakes

Manufacture of seismological instruments

Development and manufacture of seismological instruments and accessories is undertaken in the IMD Instrumentation Workshop at New Delhi. Besides catering to the needs of the national observatories, the organisation also makes a limited supply of seismological instruments to other institutions.

National Seismological Database Centre

The National Seismological Database Centre is located at New Delhi. The Central Receiving Station, which is also located at New Delhi, maintains a round the clock vigil on the occurrence of earthquakes and disseminates the information to the goverment authorities and media.

Microearthquake surveys

Earthquakes of magnitude below 3 are known as microearthquakes. Monitoring of microearthquake activity in a small area is done for many applications such as the evaluation of seismotectonics, monitoring of aftershock activity, swarm type of activity, etc. A closely spaced network with portable seismographs is operated for a short period to monitor such microearthquake activity in a specific area as and when required.