• journal_title：Bulletin of the Seismological Society of America
• Contributor：W. H. Bakun ; Li Yizheng ; F. G. Fischer ; Jin Yafu
• Publisher：Seismological Society of America
• Date：1985-
• Format：text/html
• Language：en
• journal_abbrev：Bulletin of the Seismological Society of America
• issn：0037-1106
• volume：75
• issue：6
• firstpage：1599
• section：Articles

rong>Seismograms and accelerograms from 77 earthquakes in 1982 to 1984 near the northwest end of the Red River fault in western Yunnan Province, Peoples Republic of China, have been used to calculate seismic moment, M₀, and local magnitude, M_L, using techniques established in California. For ≲ M_L ≲ , log M₀ = 16.97 + (1.17 ± 0.05)M_L, consistent with the log M₀ − M_L relation appropriate for central California. A comparison of these M_L values and the coda duration magnitudes M and S-wave amplitude magnitudes M˜ assigned by the Seismological Bureau of Yunnan Province suggests that M and M˜ values are generally larger than the M_L values. For 1.7 ≦ M ≦ 5.3, M_L = 0.49 + (0.67 ± 0.04) M and log M₀ = 17.30 + (0.86 ± 0.04) M. For 2.0 ≦ M˜ ≦ 5.4, M_L = 0.24 + (0.76 ± 0.05)M˜ and log M₀ = 17.06 + (0.95 ± 0.05)M˜.rong>