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Bulletin of the Seismological Society of America; June 1984; v. 74; no. 3; p. 957-968
© 1984 Seismological Society of America
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Estimates of magnitudes and short-period wave attenuation of Chinese earthquakes from Modified Mercalli intensity data

PEISHAN CHEN* and OTTO W. NUTTLI

ST. LOUIS UNIVERSITY, P.O. BOX 8099, LACLEDE STATION, ST. LOUIS, MISSOURI 63156

Abstract

Intensity data for Chinese earthquakes are used to estimate the body-wave magnitude, mb, of selected historical earthquakes and to estimate Q0, the 1-sec period Q value of Lg waves for various geographical areas of China. In order to derive the necessary empirical relation between the intensity distribution and mb, data are used from recent earthquakes, for which instrumentally obtained mb values as well as isoseismal maps are available. Average Qo values are approximately 175 for the mountainous regions of southwest China, 550 for southeastern China, and 150 for Taiwan. These values agree qualitatively with those obtained by Evernden (1983) and Chen et al. (1983), who utilized a different method of analysis of the intensity data

Footnotes

* On leave from the Institute of Geophysics, State Seismological Bureau, Beijing, People's Republic of China.




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