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Intermittent Slip along the Alto Tiberina Low-angle Normal Fault in Central Italy
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  • Alessandro Vuan,
  • Piero Brondi,
  • Monica Sugan,
  • Lauro Chiaraluce,
  • Raffaele Di Stefano,
  • Maddalena Michele
Alessandro Vuan
National Institute of Oceanography and Applied Geophysics - OGS, National Institute of Oceanography and Applied Geophysics - OGS

Corresponding Author:[email protected]

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Piero Brondi
National Institute of Oceanography and Applied Geophysics - OGS, National Institute of Oceanography and Applied Geophysics - OGS
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Monica Sugan
OGS - Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS - Istituto Nazionale di Oceanografia e di Geofisica Sperimentale
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Lauro Chiaraluce
Istituto Nazionale di Geofisica e Vulcanologia, Istituto Nazionale di Geofisica e Vulcanologia
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Raffaele Di Stefano
Istituto Nazionale di Geofisica e Vulcanologia, Istituto Nazionale di Geofisica e Vulcanologia
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Maddalena Michele
Istituto Nazionale di Geofisica e Vulcanologia, Istituto Nazionale di Geofisica e Vulcanologia
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Abstract

The Alto Tiberina normal fault (ATF) in Central Italy is a 50 km long crustal structure that dips at a low angle (15-20◦). Events on the fault plane are about ten times less frequent than those located in its shallower syn- and antithetic hanging-wall splays. To enhance ATF catalogue and achieve a better understanding of the degree of coupling in the fault system, we apply a template matching technique in the 2010-2014 time window. We augment by a factor 5 the detections and decrease the completeness magnitude to negative values. Contrary to what previously observed on ATF, we highlight intermittent seismic activity and long-lasting clusters interacting with sequences on the shallower splays. One of these episodes of prolonged seismic activity, detected at the end of 2013 on a 30 km long ATF segment, suggest the ATF active role during an aseismic transient unravelled by geodetic data.
16 Sep 2020Published in Geophysical Research Letters volume 47 issue 17. 10.1029/2020GL089039