Time dependence of statistical parameters: the aftershock sequence of the 
Friuli 1976 earthquake, northern Italy, and a section of the Montenegro, 
Yugoslavia, earthquake series 1979

Grünthal, Gottfried; Hurtig, E.; Ruge, E.

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Time dependence of statistical parameters: the aftershock sequence of the Friuli 1976 earthquake, northern Italy, and a section of the Montenegro, Yugoslavia, earthquake series 1979

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Grünthal, Gottfried
2.6 Seismic Hazard and Stress Field, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Hurtig, E.
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Ruge, E.
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Grünthal, G., Hurtig, E., Ruge, E. (1982): Time dependence of statistical parameters: the aftershock sequence of the Friuli 1976 earthquake, northern Italy, and a section of the Montenegro, Yugoslavia, earthquake series 1979. - Earthquake Prediction Research, 1, 3, 275-285.

https://gfzpublic.gfz-potsdam.de/pubman/item/item_232369

Abstract

Presents the time dependence of the statistical parameters alpha and beta describing seismic activity with a high time resolution. alpha stands for temporal event intensity and beta determines the distribution of magnitudes. It was studied whether these parameters are indicative as precursory phenomena predicting large aftershocks within the investigated earthquake sequences (Friuli region in 1976 and a section of the Montenegro sequence in 1979). No precursor effect could be found in the b-value of the quasi-linear Gutenberg-Richter model. b is decreasing abruptly exactly in that point when the computation window includes that large event which shall be found.-from Authors