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Microearthquakes reveal the preparatory processes for the Mw 6.1, 2009 L’Aquila earthquake and the 2016 Central Italy Seismic Sequence

Urheber*innen

Picozzi,  Matteo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Spallarossa,  Daniele
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

/persons/resource/bindi

Bindi,  Dino
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;
2.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Iaccarino,  Antonio Giovanni
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Rivalta,  Eleonora
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Picozzi, M., Spallarossa, D., Bindi, D., Iaccarino, A. G., Rivalta, E. (2023): Microearthquakes reveal the preparatory processes for the Mw 6.1, 2009 L’Aquila earthquake and the 2016 Central Italy Seismic Sequence, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2264


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018500
Zusammenfassung
We monitor the spatio-temporal deviations of observed radiated energy, ES, for thousands of microearthquakes with respect to theoretical values, ESt, derived from a scaling model between ES and seismic moment, M0, calibrated for background seismicity in central Italy. These deviations, defined here as Energy Index (EI), provide information about thespatio-temporal evolution of mean loading stress acting on faults during the preparatory processes of the latest strong earthquakes in central Italy. The EI parameter allow us to identify the onset of the activation phase one week before the Mw 6.1, 2009 L’Aquila earthquake. We show that foreshocks are characterized by a progressive increase in slip per unit stress, in agreement with the diffusion of highly pressurized fluids before the L’Aquila earthquake proposed by previous studies. Furthermore, we use EI to investigate the crustal strength before and after the three largest earthquakes of the 2016 seismic sequence (i.e., the Mw 6.2, 24 August 2016 Amatrice, the Mw 6.1, 26 October 2016 Visso, and the Mw 6.5, 30 October 2016 Norcia earthquakes). We highlight the mainshocks interaction both in terms of EI and of the mean loading shear stress associated to microearthquakes occurring within the crustal volumes comprising the mainshock hypocenters. We also show the existence of a crustal volume with high EI before the Mw 6.5 Norcia earthquake, which confirms the hypothesis that the Norcia earthquake nucleated at the boundary of a large patch, highly stressed by the two previous mainshocks of the sequence.