Research on completeness of earthquake data in the Chinese mainland (II) — The regional distribution of the beginning years of basically complete earthquake data

Based on the concrete conditions of earthquake data in the west of China, East China and South China, we studied the completeness of data in these regions by suitable methods to local conditions. Otherwise, we roughly estimated monitoring capability of local networks in China since 1970 and some outlying regions where the data is lack. Finally, we gave the regional distribution of the beginning years since which the data for different magntiude intervals are largely complete in the Chinese mainland. Contribution No. 94A0050, Institute of Geophysics, SSB, China.