China Seismological Reference Model (CSRM)

Permanent station instrument response


The China Seismological Reference Model Product Center provides a zero-pole response file for each station/event in addition to supporting data sharing of “Level 1” seismic events. The center would like to thank Dr. Li Sun of the China Earthquake Networks Center for proofreading and updating the instrument response files.  

The instruments used in the permanent stations are divided into the following four types according to the range of frequency bands that can be monitored:

  1. Ultra wide band instruments: 1/360Hz ~ 50Hz; Model: JCZ-1, etc.  
  2. Very wide band instruments: 1/120Hz ~ 50Hz; Model: CTS-1, BBVS-120, etc.  
  3. Wide band instruments: 1/60Hz ~ 50Hz; Models: BBVS-60, CMG, KS-2000, etc.  
  4. Short period instruments: 0.5Hz ~ 50Hz; Model: FSS-3DBH, etc  
Figure 1. Types of permanent stations.

The opened Level 1 seismic event waveform data includes a total of 1036 permanent stations, with the distance between stations mostly ranging from 20 km to 70 km, and the distance between stations in some areas (such as the Capital area) <20 km. There are obvious regional differences in the monitoring ability of the existing stations for small earthquakes due to the spatial heterogeneity of station distribution, background noise intensity, and the disunity of instrument type. Most of the regions can monitor ML1.5 ~ ML2.5 earthquakes, and the monitoring capacity of some concentrated stations in the east can reach ML1.0, while the coverage of the stations in some areas of Xinjiang and Tibet in the west is low and the monitoring ability is relatively weak.

Figure 2. Distribution of seismic monitoring capacity of the China National Seismic Networks. (Plotted by Kai Guo, China Earthquake Networks Center)

Attachment:ppt-Basic situation of instrument response in China National Seismic Networks-Li Sun

 Posted by at 14:13