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The Taiwan Central Weather Bureau (CWB) began to improve the original seismic network, the Central Weather Bureau Seismographic Network (CWBSN) , being a modern real-time network in 1991. From the initial 19 seismic stations, 31 new stations were constructed firstly. Meanwhile, 25 existing stations of the Taiwan Telemetered Seismographic Network (TTSN), managed by the Institute of Earth Sciences of Academia Sinica, were merged into the network as well. At last, the total number of stations increased to 75. At each station, three-component short-period seismograph with digital ground velocity output was installed. The data resolution was 12 bits, and the
sampling rate for transmission was 100 points per second then. The acquisition method for real-time seismic data upgraded from trigger mode to
continuous mode in 1994, which maintain full waveform data and improve the capabilities of small earthquakes detection. The average number of earthquakes detected in a year largely increased from 4,000 to 20,000.
Since then, the Taiwan earthquake catalog has been completely maintained.
For the purpose of seismic hazards mitigation, CWB began to deploy real- time strong-motion stations in 1995. By using the strong-motion data, source parameters of felt earthquake and seismic intensities could be
determined automatically. Consequently, it greatly shorten the reporting time of felt earthquake information. Accelerographs were individually installed or co-site with existing short-period stations. The number of stations increased from 45 in the beginning to 110. The data resolution was 16 bits and the sampling rate was 50 points per second then.
After the occurrence of 1999 Chi-Chi earthquake, 24-bit high-resolution broadband seismographic stations were constructed. The sampling rate for digital ground velocity output is 100 samples per second. In comparison with the waveform data of short-period seismograph or accelerograph, the broadband seismograph records more complete frequency band of seismic data, which are very useful for seismic wave phase simulation, focal mechanism inversion, seismic moment calculation, and global earthquake observation. At that time, including 6 stations merged from the National Central University (NCU) broadband array, a total of 33 stations were constructed. Currently, there are 12 stations still in operation.
Since then, the complete real-time seismic network CWBSN has been operated by CWB. The installed sensors in net...