Abstract
<p>At 01:36 UTC (03:36 local time) on August 24th 2016, an earthquake Mw 6.0 struck an extensive sector of the central Apennines (coordinates: latitude 42.70° N, longitude 13.23° E, 8.0 km depth). The earthquake caused about 300 casualties and severe damage to the historical buildings and economic activity in an area located near the borders of the Umbria, Lazio, Abruzzo and Marche regions. The Istituto Nazionale di Geofisica e Vulcanologia (INGV) located in few minutes the hypocenter near Accumoli, a small town in the province of Rieti. In the hours after the quake, dozens of events were recorded by the National Seismic Network (Rete Sismica Nazionale, RSN) of the INGV, many of which had a ML &gt; 3.0. The density and coverage of the RSN in the epicentral area meant the epicenter and magnitude of the main event and subsequent shocks that followed it in the early hours of the seismic sequence were well constrained. However, in order to better constrain the localizations of the aftershock hypocenters, especially the depths, a denser seismic monitoring network was needed. Just after the mainshock, SISMIKO, the coordinating body of the emergency seismic network at INGV, was activated in order to install a temporary seismic network integrated with the existing permanent network in the epicentral area. From August the 24th to the 30th, SISMIKO deployed eighteen seismic stations, generally six components (equipped with both velocimeter and accelerometer), with thirteen of the seismic station transmitting in real-time to the INGV seismic monitoring room in Rome. The design and geometry of the temporary network was decided in consolation with other groups who were deploying seismic stations in the region, namely EMERSITO (a group studying site-effects), and the emergency Italian strong motion network (RAN) managed by the National Civil Protection Department (DPC). Further 25 BB temporary seismic stations were deployed by colleagues of the British Geological Survey (BGS) and the School of Geosciences, University of Edinburgh in collaboration with INGV. All data acquired from SISMIKO stations, are quickly available at the European Integrated Data Archive (EIDA). The data acquired by the SISMIKO stations were included in the preliminary analysis that was performed by the Bollettino Sismico Italiano (BSI), the Centro Nazionale Terremoti (CNT) staff working in Ancona, and the INGV-MI, described below.</p>
Highlights
SISMIKO is an operational group in the Istituto Nazionale di Geofisica e Vulcanologia (INGV) which coordinates all the seismic emergency networks of INGV (Fig. 1)
The lessons learnt during this training test helped the coordination of the different INGV groups to handle the central Italy emergency
INGV personnel based in Grottaminarda organized two teams to go in the field for maintenance of the permanent seismic stations that were part of the RSN and for the installation of temporary stations. This group installed three temporary stations located near Amatrice, one equipped with an accelerometer, one with a short period seismometer and the other with Broad Band (BB)
Summary
SISMIKO is an operational group in the Istituto Nazionale di Geofisica e Vulcanologia (INGV) which coordinates all the seismic emergency networks of INGV (Fig. 1). Increasing the density of a seismic monitoring network, during a seismic sequence following a significant earthquake has the effect of improving the detection capabilities of the network and the precision of the earthquake locations. This in turn allows for the definition the geometry of the activated fault structures and to constrain the spatial distribution of the seismicity, it provides high quality data for hazard and seismotectonic studies and investigations into the physics of earthquakes. The lessons learnt during this training test helped the coordination of the different INGV groups to handle the central Italy emergency
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