In 1980, the State Seismological Bureau (SSB) of the People’s Republic of China, the U.S. Geological Survey (USGS), and the U.S. National Science Foundation (NSF) signed the Earthquake Studies Protocol to initiate research programs for the benefit of the earthquake hazards reduction programs in both countries (Russ and Johnson, 1985). Because high‐quality seismic data are essential to earthquake studies, one of the first elements of this protocol was the establishment of the China Digital Seismograph Network (CDSN; Fig. 1 and

The CDSN was designed as a national facility, building on existing Chinese observatories where possible. Implemented by the...

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