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  Spatiotemporal Evolution of Ground-Motion Intensity at the Irpinia Near-Fault Observatory, Southern Italy

Picozzi, M., Cotton, F., Bindi, D., Emolo, A., Maria Adinolfi, G., Spallarossa, D., Zollo, A. (2022): Spatiotemporal Evolution of Ground-Motion Intensity at the Irpinia Near-Fault Observatory, Southern Italy. - Bulletin of the Seismological Society of America, 112, 1, 243-261.
https://doi.org/10.1785/0120210153

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Picozzi, Matteo1, Autor
Cotton, Fabrice2, Autor              
Bindi, Dino2, Autor              
Emolo, Antonio1, Autor
Maria Adinolfi, Guido1, Autor
Spallarossa, Daniele1, Autor
Zollo, Aldo1, Autor
Affiliations:
1External Organizations, ou_persistent22              
22.6 Seismic Hazard and Risk Dynamics, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146032              

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 Zusammenfassung: Fault zones are major sources of hazard for many populated regions around the world. Earthquakes still occur unanticipated, and research has started to observe fault properties with increasing spatial and temporal resolution, having the goal of detecting signs of stress accumulation and strength weakening that may anticipate the rupture. The common practice is monitoring source parameters retrieved from measurements; however, model dependence and strong uncertainty propagation hamper their usage for small and microearthquakes. Here, we decipher the ground motion (i.e., ground shaking) variability associated with microseismicity detected by dense seismic networks at a near-fault observatory in Irpinia, Southern Italy, and obtain an unprecedentedly sharp picture of the fault properties evolution both in time and space. We discuss the link between the ground-motion intensity and the source parameters of the considered microseismicity, showing a coherent spatial distribution of the ground-motion intensity with that of corner frequency, stress drop, and radiation efficiency. Our analysis reveals that the ground-motion intensity presents an annual cycle in agreement with independent geodetic displacement observations from two Global Navigation Satellite System stations in the area. The temporal and spatial analyses also reveal a heterogeneous behavior of adjacent fault segments in a high seismic risk Italian area. Concerning the temporal evolution of fault properties, we highlight that the fault segment where the 1980 Ms 6.9 Irpinia earthquake nucleated shows changes in the event-specific signature of ground-motion signals since 2013, suggesting changes in their frictional properties. This evidence, combined with complementary information on the earthquake frequency–magnitude distribution, reveals differences in fault segment response to tectonic loading, suggesting rupture scenarios of future moderate and large earthquakes for seismic hazard assessment.

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Sprache(n): eng - Englisch
 Datum: 2021-12-212022
 Publikationsstatus: Final veröffentlicht
 Seiten: 19
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 Identifikatoren: DOI: 10.1785/0120210153
GFZPOF: p4 T3 Restless Earth
OATYPE: Green Open Access
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Titel: Bulletin of the Seismological Society of America
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 112 (1) Artikelnummer: - Start- / Endseite: 243 - 261 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals59
Publisher: Seismological Society of America (SSA)