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Established in July 2001, launched in June 2004, and passed the acceptance inspection in April 2008, China Digital Earthquake Observation Networks Project related to 31 province and part of surrounding country, with RMB 2.28 billion investments. It is a largest earthquake prevention and disaster preparedness project in China. The project is made up of 6 components (3 networks and 3 systems): a precursor network, a digital earthquake measure network, a digital strong earthquake network, a fault detecting system, an earthquake emergency commanding system, and an earthquake information system. The project has greatly enhanced the density of earthquake premonitory, observation and strong motion stations in whole country, with 0.4 precursor earthquake, 0.88 earthquake, and 1.2 strong earthquakes for per 10,000 square kilometer, 95% of the monitoring equipment being digitized, the shortened rapid report time from 30 minutes to 10 minutes. The magnitudes determine limit was improved from 4.5 to 2.5 and reached 1.5 in the primary populous city, 1.0 in 6 volcano region. The project has provided the firm foundation for the realization of a digital, networking, and integrated earthquake prevention and disaster preparedness system. The landmark event marked China came to new stage on earthquake prevention and disaster preparedness. |