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Delineation and Fine-Scale Structure of Active Fault Zones during the 2014-2023 unrest at the Campi Flegrei Caldera (Southern Italy) from High-Precision Earthquake Locations
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  • Francesco Scotto di Uccio,
  • Anthony Lomax,
  • Jacopo Natale,
  • Titouan Muzellec,
  • Gaetano Festa,
  • Sahar Nazeri,
  • Vincenzo Convertito,
  • Antonella Bobbio,
  • Claudio Strumia,
  • Aldo Zollo
Francesco Scotto di Uccio
Università di Napoli Federico II
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Anthony Lomax
ALomax Scientific
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Jacopo Natale
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro
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Titouan Muzellec
University of Naples Federico II
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Gaetano Festa
Università di Napoli Federico II
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Sahar Nazeri
University of Naples Federico II, Naples (Italy)
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Vincenzo Convertito
Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Vesuviano
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Antonella Bobbio
Istituto Nazionale di Geofisica e Vulcanologia
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Claudio Strumia
University of Naples Federico II
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Aldo Zollo
University of Naples Federico II

Corresponding Author:[email protected]

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Abstract

In the past two decades, the central portion of Campi Flegrei caldera has experienced ground uplift of up to 15 mm/month, and a consequent increase in the rate, magnitudes and extent of seismicity, especially in the past two years. We use a new method for multi-scale precise earthquake location to relocate the 2014-2023 seismicity and map in detail currently activated fault zones. We relate the geometry, extent, and depth of these zones with available structural reconstructions of the caldera. The current seismicity is mainly driven by the time-varying, ground-uplift induced stress concentration on pre-existing, weaker fault zones, not only related to the inner caldera, dome resurgence but also to ancient volcano-tectonic collapses and magma emplacement processes. The extent of imaged fault segments suggests they can accommodate ruptures up to magnitude 5.0, significantly increasing estimates of seismic hazard in the area.
08 Dec 2023Submitted to ESS Open Archive
10 Dec 2023Published in ESS Open Archive