The 2016 Central Italy Seismic Sequence: A First Look at the Mainshocks, Aftershocks, and Source Models

Chiaraluce, L.; Stefano, Raffaele Di; Tinti, Elisa; Scognamiglio, Laura; Michele, Maddalena; Casarotti, Emanuele; Cattaneo, M.; Gori, Pasquale De; Chiarabba, C.; Monachesi, G.; Lombardi, Anna Maria; Valoroso, Luisa; Latorre, Diana; Marzorati, S.

doi:10.1785/0220160221

Cited by 378 publications

(667 citation statements)

References 37 publications

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“…Our inverted result is consistent with previous studies [2][3][4][5][6][7]. Because the GPS and InSAR data can provide independent constraints on the fault parameters in this study, the location of the fault rupture should be more accurate.…”

Section: Discussionsupporting

confidence: 91%

“…The predominant slip occurred on the fault with a peak magnitude of 2.5 m at a depth of 0-6 km, which suggests that the rupture reached the surface (Figure 7). The result is consistent with other papers [3,6,7]. …”

Section: The 2016 Norcia Earthquakesupporting

confidence: 94%

“…The total released geodetic moment is approximately 2.16 × 10 18 Nm (Mw 6.2), and the majority of slip occurred on the fault with a peak magnitude of 1.26 m at a depth of 5-6 km ( Figure 3). The best-fitting slip model consists of two distinct slip patches located beneath the two observed lobes of deformation, in agreement with the previous studies [2][3][4][5][6][7]. The average slip errors are approximately 2.6 cm, except for the area down-dip from the left asperity, where the error increases to 14 cm, which can be attributed to reduced measurement constraints.…”

Section: The 2016 Amatrice Earthquakesupporting

confidence: 88%

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Source Parameters of the 2016–2017 Central Italy Earthquake Sequence from the Sentinel-1, ALOS-2 and GPS Data

Wen

et al. 2017

Remote Sensing

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Abstract:In this study, joint inversions of Synthetic Aperture Radar (SAR) and Global Position System (GPS) measurements are used to investigate the source parameters of four Mw > 5 events of the 2016-2017 Central Italy earthquake sequence. The results show that the four events are all associated with a normal fault striking northwest-southeast and dipping southwest. The observations, in all cases, are consistent with slip on a rupture plane, with strike in the range of 157 • to 164 • and dip in the range of 39 • to 44 • that penetrates the uppermost crust to a depth of 0 to 8 km.

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Section: Discussionsupporting

confidence: 91%

Section: The 2016 Norcia Earthquakesupporting

confidence: 94%

Section: The 2016 Amatrice Earthquakesupporting

confidence: 88%

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Source Parameters of the 2016–2017 Central Italy Earthquake Sequence from the Sentinel-1, ALOS-2 and GPS Data

Wen

et al. 2017

Remote Sensing

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“…The following seismic sequence was characterized by numerous aftershocks located southeast and northwest of the epicenter [Chiaraluce et al, 2017], which decreased in frequency and magnitude until the end of October, when a M w 5.9 event occurred on 26 October about 25 km to the NW of the previous main shock, between Visso and Ussita villages (Figure 1). Moreover, on 30 October, a third large event of magnitude M w 6.5 nucleated below the town of Norcia, striking the area between the two preceding events and filling the gap between the previous ruptures.…”

Section: Introductionmentioning

confidence: 99%

“…To examine the achieved results, we also exploit the information on the relocated aftershocks distribution [Chiaraluce et al, 2017] and on the known geologic structures of the area [Lavecchia et al, 2016]. …”

Section: Introductionmentioning

confidence: 99%

Geodetic model of the 2016 Central Italy earthquake sequence inferred from InSAR and GPS data

Cheloni

Novellis

Albano

et al. 2017

Geophysical Research Letters

169

257

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We investigate a large geodetic data set of interferometric synthetic aperture radar (InSAR) and GPS measurements to determine the source parameters for the three main shocks of the 2016 Central Italy earthquake sequence on 24 August and 26 and 30 October (Mw 6.1, 5.9, and 6.5, respectively). Our preferred model is consistent with the activation of four main coseismic asperities belonging to the SW dipping normal fault system associated with the Mount Gorzano‐Mount Vettore‐Mount Bove alignment. Additional slip, equivalent to a Mw ~ 6.1–6.2 earthquake, on a secondary (1) NE dipping antithetic fault and/or (2) on a WNW dipping low‐angle fault in the hanging wall of the main system is required to better reproduce the complex deformation pattern associated with the greatest seismic event (the Mw 6.5 earthquake). The recognition of ancillary faults involved in the sequence suggests a complex interaction in the activated crustal volume between the main normal faults and the secondary structures and a partitioning of strain release.

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Physical and Transport Property Variations Within Carbonate‐Bearing Fault Zones: Insights From the Monte Maggio Fault (Central Italy)

Trippetta

Carpenter

Mollo

et al. 2017

Geochem Geophys Geosyst

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The physical characterization of carbonate‐bearing normal faults is fundamental for resource development and seismic hazard. Here we report laboratory measurements of density, porosity, Vp, Vs, elastic moduli, and permeability for a range of effective confining pressures (0.1–100 MPa), conducted on samples representing different structural domains of a carbonate‐bearing fault. We find a reduction in porosity from the fault breccia (11.7% total and 6.2% connected) to the main fault plane (9% total and 3.5% connected), with both domains showing higher porosity compared to the protolith (6.8% total and 1.1% connected). With increasing confining pressure, P wave velocity evolves from 4.5 to 5.9 km/s in the fault breccia, is constant at 5.9 km/s approaching the fault plane and is low (4.9 km/s) in clay‐rich fault domains. We find that while the fault breccia shows pressure sensitive behavior (a reduction in permeability from 2 × 10−16 to 2 × 10−17 m2), the cemented cataclasite close to the fault plane is characterized by pressure‐independent behavior (permeability 4 × 10−17 m2). Our results indicate that the deformation processes occurring within the different fault structural domains influence the physical and transport properties of the fault zone. In situ Vp profiles match well the laboratory measurements demonstrating that laboratory data are valuable for implications at larger scale. Combining the experimental values of elastic moduli and frictional properties it results that at shallow crustal levels, M ≤ 1 earthquakes are less favored, in agreement with earthquake‐depth distribution during the L'Aquila 2009 seismic sequence that occurred on carbonates.

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The 2016 Central Italy Seismic Sequence: A First Look at the Mainshocks, Aftershocks, and Source Models

Cited by 378 publications

References 37 publications

Source Parameters of the 2016–2017 Central Italy Earthquake Sequence from the Sentinel-1, ALOS-2 and GPS Data

Source Parameters of the 2016–2017 Central Italy Earthquake Sequence from the Sentinel-1, ALOS-2 and GPS Data

Geodetic model of the 2016 Central Italy earthquake sequence inferred from InSAR and GPS data

Physical and Transport Property Variations Within Carbonate‐Bearing Fault Zones: Insights From the Monte Maggio Fault (Central Italy)

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