Messa in sicurezza di edifici storici Gian Paolo Cimellaro Associate Professor Politecnico di Torino, Italy October 31, 2016
Outline Tectonic summary; Historical seismicity; Seismic sequence; Main event of October 30th, 2016 (Mw 6.5) Conclusion.
Tectonic summary The Italian territory is located between African and Eurasia plate. The Apennines region was generated by the subduction of the Adria microplate (part of African plate) beneath Eurasia
Tectonic summary Individual Seismogenic Source for the Central Apennins zone (INGV, 2016).
Historical seismicity Historical Catalogue of strong earthquake from 1000 to 2016. (INGV, 2016) Mw Number of earthquakes 6.0-6.9 12 >= 7.0 1
Seismic sequence Seismic sequence in Central Italy from August 24 to October 30. INGV (2016)
(Mw 6.5) Fault mechanism
(ML 6.5) Shakemap in the zone close to the epicenter for the main event of 6.5 ML (INGV, 2016).
(Mw 6.5) Recording stations Epicenter: Lat: 42.7925 N, Long: 13.0965 E (City of Norcia)
(Mw 6.5) Selected recording stations Station Location Re [km] NRC Norcia 5.40 ACT Acquasanta Terme 25.90 T1201 Domo 23.30 FOC Colfiorito 27.10
(Mw 6.5) Horizontal peak ground accelerations PGA Horizontal Components 500 467 465 400 408 371 335 340 328 PGA [cm/s2] 300 200 225 E W N S 100 0 ACT FOC T1201 NRC
(Mw 6.5) Vertical peak ground accelerations PGA Vertical Component 400 352 300 PGA [cm/s2] 200 229 219 228 U D 100 0 ACT FOC T1201 NRC
(Mw 6.5) Horizontal components of Arias Intensity Ia componenti E W NRC 363.55 T1201 90.63 FOC 226.34 ACT 65.87 0 50 100 150 200 250 300 350 400 INTENSITA' DI ARIAS [CM/S] N S component NRC 244.73 T1201 222.62 FOC 164.72 ACT 123.3 0 50 100 150 200 250 300 350 400 INTENSITA' DI ARIAS [CM/S]
(Mw 6.5) Comparison between horizontal spectra and Design Code spectra (SLV and SLC) 2000 1750 1500 SLC SLV Acquasanta_EW Acquasanta_NS 1250 Sa(T) [m/s2] 1000 750 500 250 0 0 0.5 1 1.5 2 2.5 3 3.5 4 Periodo [s]
(Mw 6.5) Comparison between horizontal spectra and Design Code spectra (SLV and SLC) 2000 1750 1500 SLC SLV Foligno_EW Foligno_NS 1250 Sa(T) [m/s2] 1000 750 500 250 0 0 0.5 1 1.5 2 2.5 3 3.5 4 Periodo [s]
(Mw 6.5) Comparison between horizontal spectra and Design Code spectra (SLV and SLC) 2000 1750 1500 SLC SLV Domo_EW Domo_NS 1250 Sa(T) [m/s2] 1000 750 500 250 0 0 0.5 1 1.5 2 2.5 3 3.5 4 Periodo [s]
(Mw 6.5) Comparison between horizontal spectra and Design Code spectra (SLV and SLC) 2000 1750 1500 SLC SLV Norcia_EW Norcia_NS 1250 Sa(T) [m/s2] 1000 750 500 250 0 0 0.5 1 1.5 2 2.5 3 3.5 4 Periodo [s]
(Mw 6.5) PGA attenuation PGA ATTENUATION 500 Recorded PGA Log. (Recorded PGA) 400 PGA [cm/s2] 300 200 100 0 0 10 20 30 40 50 60 70 80 90 100 110 Distanza Epicentrale [Km]
(Mw 6.5) Comparison of the PGA attenuation Comparison of the PGA Attenuation 500 Regressione Log. Ambraseys 96 (Soft) Log. (Regressione Log.) 400 PGA [cm/s2] 300 200 100 0 0 10 20 30 40 50 60 70 80 90 100 110 Distanza Epicentrale [Km]
(Mw 6.5) PGV attenuation 100 PGV Attenuation 80 PGV [cm/s] 60 40 20 0 0 10 20 30 40 50 60 70 80 90 100 110 Distanza Epicentrale [Km]
Castelluccio Town general view
Castelluccio soft story behavior
Castelluccio Open stirrups
Ancient city walls - Norcia POLITECNICO DI TORINO DISEG G. P. CIMELLARO
Ancient city walls - Norcia Incomplete shoring up intervention POLITECNICO DI TORINO DISEG G. P. CIMELLARO
Monastery of Sant Antonio -Norcia Complete shoring up intervention
Monastery of Sant Antonio -Norcia Complete shoring up intervention POLITECNICO DI TORINO DISEG G. P. CIMELLARO