Mapping b-values in France using two different magnitude ranges: Possible non power-law behavior

Details Mapping b-values in France using two different magnitude ranges: Possible non power-law behavior Mapping b-values in France using two different magnitude ranges: Possible non power-law behavior

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30qsde1b&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 17, pp. SDE 1-1, CiteID 1892, DOI 10.1029/2003GL017576

Physics

1

Seismology: Seismic Hazard Assessment And Prediction, Seismology: Seismicity And Seismotectonics, Tectonophysics: Rheology-General

Scientific paper

The first step in probabilistic seismic hazard assessment is the characterization of seismic sources. The fundamental assumption is that the Gutenberg-Richter power law can be applied and is valid at all scales. In this study, we found that the power-law model may not be verified in the southeastern regions of France. Frequency-magnitude distributions are mapped using 2 different magnitude ranges: (1) [3.0-4.4] using only homogeneous instrumental data, (2) [3.5-Mmax(observed)] using instrumental and historical data. b-values estimated on these two magnitude ranges are similar in the Pyrenees and the Rhine Basin. However, they differ significantly in the Southern Alps: the slopes estimated on magnitude range [3.0-4.4] are much steeper (b > 1.4) than the slopes estimated on magnitudes above 3.5 (0.9 < b < 1.1). Until a clear identification of the underlying processes is made, a conservative option (i.e., lowest b-values) should be considered for probabilistic estimation of hazard in the eastern part of France.

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