Time-Magnitude Correlations and Time Variation of the Gutenberg–Richter Parameter in Foreshock Sequences

The time dependence of the parameter of the Gutenberg–Richter (GR) magnitude distribution is identified for foreshock sequences of earthquakes, correlated with the main shock, by using the geometric-growth model of earthquake focus, the magnitude distribution of correlated earthquakes and the time-m...

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Bibliographic Details
Published in:Pure and applied geophysics 2024, Vol.181 (1), p.27-36
Main Author: Apostol, B. F.
Format: Article
Language:English
Subjects:
Aftershocks
Correlation
Distribution
Earth and Environmental Science
Earth Sciences
Earthquakes
Geophysics/Geodesy
Growth models
Parameter identification
Seismic activity
Time dependence
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Summary:The time dependence of the parameter of the Gutenberg–Richter (GR) magnitude distribution is identified for foreshock sequences of earthquakes, correlated with the main shock, by using the geometric-growth model of earthquake focus, the magnitude distribution of correlated earthquakes and the time-magnitude correlations, derived recently. It is shown that this parameter decreases in time in the foreshock sequence, from the background values down to the main shock. If correlations are present, this time dependence and the time-magnitude correlations provide a tool of monitoring the foreshock seismic activity. We analyze the relevance of such a procedure for the occurrence moment and the magnitude of a main shock. The limitations of such an analysis are discussed.
ISSN:0033-4553
1420-9136
DOI:10.1007/s00024-023-03399-4