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Notice about replacement of decimation filters of F-net data

■ Feb 25, 2005

  We will replace the decimation filters both of 20Hz sampling data and 1Hz sampling data on March/01/2005.
  After the replacement of the recording system, we have used IIR filters as the decimation filters.
  We will apply new FIR filters of the features of zero-phase and linear phase delay. Please see the SEED header for details.
  The data already created by the old filters will still remain until we re-make them a few months later.
  We will notice it again in this site, when the data is available.

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Broadband Seismograph Network Laboratory, Network Center for Earthquake, Tsunami and Volcano,
National Research Institute for Earth Science and Disaster Resilience.
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