Abstract
<p><em>We relocated the aftershocks of the M<sub>W</sub> 6.0 Amatrice 2016 mainshock by inverting with a non-linear probabilitstic method P- and S-arrival time readings produced and released in near realtime by the analyst seismologists of IGNV on duty in the seismic monitoring room. Earthquakes distribution shows the activation of a normal fault system with a main SW-dipping fault extending from Amatrice to NW of Accumoli village for a total length of 40 km. On the northern portion of the main fault hanging-wall volume, the structure become more complex activating an antithetic fault below the Norcia basin. It is worth nothing that below 8-9 km of depth, the whole fault system has an almost continuous sub-horizontal layer interested by an intense seismic activity, about 2 km</em> thick.</p>
Highlights
On the 24th of August, 2016 at 01:36 UTC a Mw 6.0 earthquake struck a region of Central Italy, severely damaging tens of villages and causing several fatalities
The sub-horizontal layer at about 8-9 km is still present in this portion of the fault system as confirmed by the along strike section CC’ (Figure 2D)
The CC’ section shows a lack of seismic activity in a large area of about 4x10 km2 located right above the Amatrice mainshock
Summary
On the 24th of August, 2016 at 01:36 UTC a Mw 6.0 earthquake struck a region of Central Italy, severely damaging tens of villages and causing several fatalities. On October 26th a Mw 5.9 earthquake occurred 14 km NNE of Norcia preceding the largest event of the sequence, a Mw 6.5 on 30th October at 06:40 UTC, 6 km North of Norcia This ensuing phase of the sequence, enlighten a ~15 km long sector toward N-NW of Norcia and reactivated the northern sector of the previously activated fault system. The so called Amatrice sequence is located along the Apenninic sector extending across the Olevano-AntrodocoSibillini (OAS) [Centamore et al, 2009] tectonic alignment, a major inherited thrust front (NNE-trending), along which the UmbriaMarche and the Latium-Abruzzi domains come into contact This is a tectonically active sector undergoing post-orogenic Quaternary extension, as expressed at surface by a set of NNW–trending normal faults [Pizzi and Galadini, 2009 and references. We used seismicity distribution to investigate the main fault geometrical continuity between the two main patches ruptured during the Mw 6.0 mainshock, as identified by Tinti et al [2016]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
