Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 225, Issue 2, Pages 1236-1257Publisher
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggaa611
Keywords
Numerical modelling; Probabilistic forecasting; Time-series analysis; Statistical seismology
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Funding
- MIUR PRIN 2017 project [201798CZLJ]
- VALERE project of the University of Campania Luigi Vanvitelli
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Research has shown that despite an epidemic description of post-seismic activity, it is possible to also consider temporal clustering related to foreshocks, with the current number of observed foreshocks significantly greater than predicted. The results suggest that the existence of a preparatory phase to anticipate main shocks is the most plausible explanation for the occurrence of foreshocks.
The epidemic type aftershock sequence (ETAS) model provides a good description of the post-seismic spatio-temporal clustering of seismicity and is also able to capture some features of the increase of seismic activity caused by foreshocks. Recent results, however, have shown that the number of foreshocks observed in instrumental catalogues is significantly much larger than the one predicted by the EMS model. Here we show that it is possible to keep an epidemic description of post-seismic activity and, at the same time, to incorporate pre-seismic temporal clustering, related to foreshocks. Taking also into-account the short-term incompleteness of instrumental catalogues, we present a model which achieves very good description of the southern California seismicity both on the aftershock and on the foreshock side. Our results indicate that the existence of a preparatory phase anticipating main shocks represents the most plausible explanation for the occurrence of foreshocks.
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