Bulletin of the Seismological Society of America; February 2006; v. 96; no. 1;
p. 11-32; DOI: 10.1785/0120040166
© Seismological Society of America
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Figure 4. b-value curves for the study region. (a) Discrete occurrence rates,
where n is the discrete number of earthquakes in the magnitude range
M ±0.25. Error bars show the uncertainty range determined using
the method illustrated in
Figure 3. A different estimate
for the uncertainty in the number of events per year can be inferred from the
plot because earthquake occurrences are approximately a Poisson process (the
approximation is better for M > 6), and for a Poisson process the
variance is equal to the mean. (b) Cumulative earthquake occurrence rates, where
N is the total number of earthquake events of magnitude M or
greater.
