Estimation of the Earthquake Recurrence Parameters for Unequal Observation Periods for Different Magnitudes
Recent requirements of seismic risk estimation have led to a re-evaluation of historical earthquake records and statistical methods in many countries, with a view to optimizing the use of the available information. Whatever approach is chosen to quantify risk, the basic information is earthquake catalogs from which a recurrence relation is derived. Its most widely used form is still the Gutenberg-Richter loglinear relation, log N = a - bm, perhaps with some modification at larger magnitudes.
Weichert, D.H., 1980, Estimation of the earthquake recurrence parameters for unequal observation periods for different magnitudes: Bulletin of the Seismological Society of America, v. 70, p. 1337-1346.