AWhat changed
Gutenberg and Richter compare earthquake frequencies in California with worldwide counts and fit a log-linear relationship between magnitude bins and event frequency, with explicit regional and extrapolation limits.
Scientific scope
Gutenberg and Richter compare earthquake frequencies in California with worldwide counts and fit a log-linear relationship between magnitude bins and event frequency, with explicit regional and extrapolation limits. The target is the 1944 regional frequency analysis, not the 1935 magnitude-scale construction or modern moment magnitude. Its N counts earthquakes in specified magnitude bins; the fitted log N=a+b(8-M) must not be silently replaced by later cumulative-threshold notation. Completeness varies with magnitude, geographic boundaries and observation period; small-event undercount and sparse extreme events affect the fit. Region/global comparisons are historical, not current universal rates. The paper explicitly limits extrapolation beyond its supported magnitude range, discusses clustering, quiet intervals and changing rates, and allows wide variation in any particular century. The relation does not predict the time of a specific earthquake. The reported catalogue window is January 1934 to May 1943. The exact fit tables and their numerical values have not been independently certified here. No catalogue or numerical fit was replayed. Earlier magnitude/global work and Ishimoto-Iida antecedents remain separate; the 1939 original is unread and exclusive priority is unresolved.
Evidence
Source-linked, scoped account of the original work. The published scope states the scientific assumptions and remaining verification limits. WRS has not independently certified the full proof, experimental result or system benchmark.
Contributors
- B. Gutenberg · SCIENCE: Original source-listed scientific author of this scoped work; byline does not determine effort fractions.
- C. F. Richter · SCIENCE: Original source-listed scientific author of this scoped work; byline does not determine effort fractions.
- B. Gutenberg and C. F. Richter, Frequency of earthquakes in California (BSSA 34(4),185-188, October 1944), original published scan
- Karen R. Felzer, Calculating California seismicity rates (USGS 2008), selected institutional abstract
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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