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What is F-net
  National Research Institute for Earth Science and Disaster Resilience (NIED) started to install a nationwide broadband seismograph network in 1994 under the project named "FREESIA" (Fundamental Research on Earthquakes and Earth's Interior Anomaly).

  The Headquarter for Earthquake Research Promotion, which was organized under the former Prime Minister's Office after the 1995 Hyogo-ken Nanbu Earthquake, resolved "Fundamental Seismic Survey and Observation Plan" in August 29, 1997 with the following keynotes;

  • Objective: To promote earthquake research to contribute to reduce earthquake damages.
  • Puropose:
    1. Understanding earthquake phenomena and prediction of its occurrence.
    2. Understanding strong ground motion and its prediction.
  • Measure: As a core of comprehensive seismic survey and observation,
                          the Headquarter promotes the Fundamental Survey and Observations as below.
    1. Earthquake Observations
      1. Inland earthquake observation by high sensitivity seismographs (Observation of microearthquakes)
      2. Inland earthquake observation by broadband seismographs
    2. Strong motion observations
    3. Observations of crustal deformation (GPS continuous observation)
    4. Survey of inland and coastal active faults

    The FREESIA project was taken over by the measure "Inland earthquake observation by broadband seismographs" above.

    As the FREESIA Project was finished in March 2001, its seismographic network was integrated into the network installed as a part of the measure by the Headquarter for Earthquake Research Promotion (so called KIBAN network), and NIED continues to take charge of its installation and maintenance, as the "F-net (Full Range Seismograph Network of Japan)".

    The data observed by the "F-net" are already utilized for studying mechanisms of earthquake occurrence and expected to give a large contribution to understanding of earthquake phenomena.


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    Broadband Seismograph Network Laboratory, Network Center for Earthquake, Tsunami and Volcano,
    National Research Institute for Earth Science and Disaster Resilience.
    3-1 Tennodai, Tsukuba City, Ibaraki Prefecture, 305-0006, JAPAN
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