What is recorded here?
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. Large earthquakes are rarer than small ones, but turning that observation into a usable relationship requires consistent magnitude measurements and reliable counts. This paper compares regions and fits a straight line to logarithmic event frequencies across magnitude bins. It makes both the empirical pattern and its limitations visible: incomplete small-event records, few extreme events, clustering and short historical observation windows. The result helps organize seismicity statistics without promising the date of the next earthquake.
Source-linked catalogue note. A detailed explanatory guide has not yet been prepared for this entry.
Scientific scope
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.
Read the original work
- B. Gutenberg and C. F. Richter, Frequency of earthquakes in California (BSSA34(4),185-188,October1944), original published scan
- Karen R. Felzer, Calculating California seismicity rates (USGS 2008), selected institutional abstract
This English explanation is an editorial reading view. It does not replace the complete original work or certify its science.
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People and systems
B. Gutenberg; C. F. Richter
Source-listed contributors to this scoped work. Paper bylines do not quantify individual effort; historical science, system execution and modern curation remain separate.
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English catalogue narrative
Earthquake frequency: a historical magnitude-scale regularity
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.
Large earthquakes are rarer than small ones, but turning that observation into a usable relationship requires consistent magnitude measurements and reliable counts. This paper compares regions and fits a straight line to logarithmic event frequencies across magnitude bins. It makes both the empirical pattern and its limitations visible: incomplete small-event records, few extreme events, clustering and short historical observation windows. The result helps organize seismicity statistics without promising the date of the next earthquake.
Scientific scope
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.
People and systems
B. Gutenberg; C. F. Richter