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Jiang Changsheng
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Jiang Changsheng Institute of Geophysics, China Earthquake Administration, Beijing 100081, China 
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Location Accuracy of the China National Seismograph Network Estimated by Repeating Events
Jiang Changsheng
Abstract:
Regionalized location accuracy of the China National Seismograph Network was estimated using the results obtained by studying “repeating earthquakes" or “doublets" in and around China by Schaff and Richards (2004). It is assumed that the “repeating events" or “doublets" are separated by no more than 1km, and the network measured apparent distance X of “doublets" indicates the order of magnitudes of the location error. It is observed that the average location accuracy of the China National Seismograph Network, as represented by average X value, is in the order of magnitudes of 10km, and is larger in the Qinghai-Xizang (Tibet) Plateau, western and northern Xinjiang, and eastern Inner Mongolia.
Key words:  Repeating earthquakes  Earthquake location  Seismograph network