Publication Date:
2021-03-02
Description:
Large earthquakes occurring worldwide have long been recognized to be non Poisson
distributed, so involving some large scale correlation mechanism, which could be internal
or external to the Earth. We have recently demonstrated this observation can be
explained by the correlation of global seismicity with solar activity. We inferred such a
clear correlation, highly statistically significant, analyzing the ISI-GEM catalog
1996–2016, as compared to the Solar and Heliospheric Observatory satellite data,
reporting proton density and proton velocity in the same period. However, some
questions could arise that the internal correlation of global seismicity could be mainly
due to local earthquake clustering, which is a well-recognized process depending on
physical mechanisms of local stress transfer. We then apply, to the ISI-GEM catalog, a
simple and appropriate de-clustering procedure, meant to recognize and eliminate local
clustering. As a result, we again obtain a non poissonian, internally correlated catalog,
which shows the same, high level correlation with the proton density linked to solar
activity. We can hence confirm that global seismicity contains a long-range correlation,
not linked to local clustering processes, which is clearly linked to solar activity. Once we
explain in some details the proposed mechanism for such correlation, we also give
insight on how such mechanism could be used, in a near future, to help in earthquake
forecasting.
Description:
Published
Description:
595209
Description:
7T. Variazioni delle caratteristiche crostali e precursori sismici
Description:
JCR Journal
Keywords:
worldwide earthquakes
;
solar activity
;
long range correlation
;
solar and heliospheric observatory satellite
;
proton density
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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