The August 24th 2016 Mw 6.0 Amatrice Earthquake struck Central Italy, causing 298 casualties, hundreds of injured and the almost complete destruction of the historical villages of Amatrice, Accumoli and Arquata del Tronto. Unfortunately, the Amatrice main shock was the beginning of a long-lasting seismic sequence of more than 50000 events that culminated with the October 30th Mw 6.5 2016 Norcia Earthquake, located about 20 km NW of the Amatrice epicentre. Moreover, the sequence included two Mw 5.4 and 5.9 earthquakes occurred on October 29th 2016 close to the Norcia epicentre and four earthquakes of Ml in the range 5-5.5 on January 18th 2017 about 20 km SE of the Amatrice earthquake epicentre. This sequence left behind a widespread damage across the territory of 138 municipalities distributed over 6 Provinces in 4 Regions in Central Italy. Soon after the emergency period, the Italian Government Commissioner for the reconstruction sponsored and funded an ambitious project devoted to the Seismic Microzonation of the 138 municipalities. The project was ambitious in the sense that it involved the coordination of several local authorities at different levels, researchers and consultants. Project scientific coordination was entrusted to the Italian Seismic Microzonation Centre (ISMC), an association of 25 research institutions and university departments providing expertise in a wide spectrum: applied geophysics, engineering-seismology, geotechnical earthquake-engineering and engineering-geology. The goal was twofold: oproviding helpful information for the reconstruction in the municipalities that suffered almost complete destruction, such as Amatrice, Accumoli and Arquata del Tronto; ooffering information for land planning and urban development in the municipalities that suffered moderate to low damage. The activities involved: ogeological surveys and in situ geotechnical testing for the identification of the engineering-geological units and their 3D geometries; ogeophysical surveys for the characterization of the sub-surface units in terms of dynamic properties; ogeotechnical laboratory testing for the estimation of the non-linear behaviour of the units under cyclic and/or dynamic conditions; onumerical simulations for the estimation of local seismic response (LSR); oseismological analysis for i) the retrieval of waveforms compatible with the building code to be used as seismic input for the numerical simulations, ii) calibration of numerical simulations and iii)empirical determination of LSR. The proposed Special Issue of the Bulletin of Earthquake Engineering would be aimed at the description of the activities carried out for this project, which we believe can be valuable for the audience of the journal because of several reasons. First and foremost, during the project the participants addressed a broad range of topics of significant scientific interest, ranging from the seismic-induced landslide susceptibility analysis to the suitability of surface-wave methods for the determination of the shear-wave velocity as a function of local geology and to the comparison of LSR results from seismic simulations and empirical estimations. Further, several products of the activity, such as the normalized shear modulus decay (G/G0-?) and damping (D-?) curves database or the earthquake records acquired by the seismic networks managed for the project, may be of practical use for the scientific and professionals communities. Lastly, at the beginning of this project were developed guidelines, standards and protocols for: ogeophysical measurements acquisition and processing; oengineering-geological mapping; oGIS archiving of seismic microzonation data; oseismic microzonation mapping; which may be a starting point for the definition of best practices and standards for seismic microzonation at the Euro-Mediterranean scale.
BEEE - Bulletin of Earthquake Engineering-Special Issue "Seismic Microzonation of Central Italy"
Iolanda Gaudiosi
2019
Abstract
The August 24th 2016 Mw 6.0 Amatrice Earthquake struck Central Italy, causing 298 casualties, hundreds of injured and the almost complete destruction of the historical villages of Amatrice, Accumoli and Arquata del Tronto. Unfortunately, the Amatrice main shock was the beginning of a long-lasting seismic sequence of more than 50000 events that culminated with the October 30th Mw 6.5 2016 Norcia Earthquake, located about 20 km NW of the Amatrice epicentre. Moreover, the sequence included two Mw 5.4 and 5.9 earthquakes occurred on October 29th 2016 close to the Norcia epicentre and four earthquakes of Ml in the range 5-5.5 on January 18th 2017 about 20 km SE of the Amatrice earthquake epicentre. This sequence left behind a widespread damage across the territory of 138 municipalities distributed over 6 Provinces in 4 Regions in Central Italy. Soon after the emergency period, the Italian Government Commissioner for the reconstruction sponsored and funded an ambitious project devoted to the Seismic Microzonation of the 138 municipalities. The project was ambitious in the sense that it involved the coordination of several local authorities at different levels, researchers and consultants. Project scientific coordination was entrusted to the Italian Seismic Microzonation Centre (ISMC), an association of 25 research institutions and university departments providing expertise in a wide spectrum: applied geophysics, engineering-seismology, geotechnical earthquake-engineering and engineering-geology. The goal was twofold: oproviding helpful information for the reconstruction in the municipalities that suffered almost complete destruction, such as Amatrice, Accumoli and Arquata del Tronto; ooffering information for land planning and urban development in the municipalities that suffered moderate to low damage. The activities involved: ogeological surveys and in situ geotechnical testing for the identification of the engineering-geological units and their 3D geometries; ogeophysical surveys for the characterization of the sub-surface units in terms of dynamic properties; ogeotechnical laboratory testing for the estimation of the non-linear behaviour of the units under cyclic and/or dynamic conditions; onumerical simulations for the estimation of local seismic response (LSR); oseismological analysis for i) the retrieval of waveforms compatible with the building code to be used as seismic input for the numerical simulations, ii) calibration of numerical simulations and iii)empirical determination of LSR. The proposed Special Issue of the Bulletin of Earthquake Engineering would be aimed at the description of the activities carried out for this project, which we believe can be valuable for the audience of the journal because of several reasons. First and foremost, during the project the participants addressed a broad range of topics of significant scientific interest, ranging from the seismic-induced landslide susceptibility analysis to the suitability of surface-wave methods for the determination of the shear-wave velocity as a function of local geology and to the comparison of LSR results from seismic simulations and empirical estimations. Further, several products of the activity, such as the normalized shear modulus decay (G/G0-?) and damping (D-?) curves database or the earthquake records acquired by the seismic networks managed for the project, may be of practical use for the scientific and professionals communities. Lastly, at the beginning of this project were developed guidelines, standards and protocols for: ogeophysical measurements acquisition and processing; oengineering-geological mapping; oGIS archiving of seismic microzonation data; oseismic microzonation mapping; which may be a starting point for the definition of best practices and standards for seismic microzonation at the Euro-Mediterranean scale.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
