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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-130
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Brief communication
02 May 2017
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A revision of this discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Brief Communication Co-seismic displacement on October 26 and 30, 2016 (Mw 5.9 and 6.5) – earthquakes in central Italy from the analysis of discrete GNSS network
Giorgio De Guidi1, Alessia Vecchio1, Fabio Brighenti1, Riccardo Caputo2,3, Francesco Carnemolla1, Adriano Di Pietro1, Marco Lupo1, Massimiliano Maggini2, Salvatore Marchese1, Danilo Messina1, Carmelo Monaco1, and Salvatore Naso1 1Department of Biological Geological and Environmental Sciences, Universiy of Catania, Italy
2Department of Physics and Earth Sciences, University of Ferrara, Italy
3Research and Teaching Center for Earthquake Geology, Tyrnavos, Greece
Abstract. On October 26th 2016, immediately north of the epicentral area affected by the Mw 6.0, August 24th earthquake, a strong earthquake (Mw = 5.9), with a focal mechanism showing W-dipping normal faulting, occurred at the boundary between Marche and Umbria regions (central Apennines, Italy). Four days later (on October 30th), the main-shock (Mw = 6.5) of the whole seismic sequence occurred in the same area. The central Apennines are characterized by northeast-verging thrust-propagation folds, involving Mesozoic- Tertiary sedimentary successions. During the 2016 sequence, coseismic deformation has been recorded at the rear of the Sibillini Thrust which separates the main mountain chain from the Marche-Abruzzi foothills (Fig. 1). This contractional structure has been partly dissected and/or inverted by NNW-SSE trending Quaternary normal and oblique-slip faults. The major event (October 30) induced extensive geological effects at the surface and structural damages in the broader epicentral area up to a distance of 30 km. According to the report of the Istituto Nazionale di Geofisica e Vulcanologia (SUMMARY REPORT ON THE 30 OCTOBER, 2016 EARTHQUAKE IN CENTRAL ITALY Mw 6.5, Gruppo di Lavoro INGV sul Terremoto in centro Italia 10 November 2016), the hypocenter of major event was located at 42.8322° N, 13.1107° E at a depth of 9.2 km (Figs. 1 and 2). Following the August seismic events, we installed five new geodetic points located on both sides of the principal fracture zone and carried out two campaigns of GNSS measurements, the first one at the end of September (30-09/02-10, 2016), the second one early November (11/13-11, 2016) that covered the period of the October events.

In this brief communication, we provide the results of our geodetic campaigns that registered the co- seismic displacement occurred in the period between doy (day of year) 2016/274 and doy 2016/318, therefore documenting the two latter major shocks. We also compare our results with the available surface deformation field of the broader area obtained on the basis of the DInSAR technique and particularly the elaboration realized by CNR-IREA of Sentinel-1 radar imaging of Copernicus European Program of 26/10–1/11 (http://www.irea.cnr.it/index.php?option=com_k2&view=item&id=761:nuovi-risultati-sul-terremoto- del-30-ottobre-2016-ottenuti-dai-radar-dei-satelliti-sentinel-1). The comparison shows an overall good fit. It’s worth to note that these earthquakes occurred in a sector of the Central Apennines characterized by high geodetic strain-rates (e.g., D’Agostino 2014), where several continuous GNSS stations are operating.


Citation: De Guidi, G., Vecchio, A., Brighenti, F., Caputo, R., Carnemolla, F., Di Pietro, A., Lupo, M., Maggini, M., Marchese, S., Messina, D., Monaco, C., and Naso, S.: Brief Communication Co-seismic displacement on October 26 and 30, 2016 (Mw 5.9 and 6.5) – earthquakes in central Italy from the analysis of discrete GNSS network, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-130, in review, 2017.
Giorgio De Guidi et al.
Giorgio De Guidi et al.
Giorgio De Guidi et al.

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Short summary
In this paper we provide new and original data which shown the deformation behaviour, closer the seismogenic segment of the Mt. Vettore normal fault system during coseismic deformation (30 October 2016 Mw 5.9. This foresight action allowed us to record the second (strongest) event (Mw 6.5) of 30 October 2016. We have identified the specific fault zone most vulnerable to future seismic events just north of the fault segment reactivated on 24 August.
In this paper we provide new and original data which shown the deformation behaviour, closer the...
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