Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; June 1972; v. 62; no. 3; p. 789-792
© 1972 Seismological Society of America
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Precision of different varieties of magnitude

B. F. Howell, Jr.

DEPARTMENT OF GEOSCIENCES GEOPHYSICS SECTION PENNSYLVANIA STATE UNIVERSITY, UNIVERSITY PARK, PENNSYLVANIA 16802

Abstract

The standard deviations of the body-wave magnitude, surface-wave magnitude and frequency-band magnitude of four shallow (H < 60 km) earthquakes are compared. For three out of four of these earthquakes, surface-wave magnitude exhibited lower standard deviations than either body-wave or frequency-band magnitude. In three out of the four cases, lower standard deviations were obtained by calculating surface-wave magnitude from the largest surface-wave amplitude than from time-correlated surface-wave phases.






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