POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Gian Paolo CimellaroAssociate Professor
Politecnico di Torino, Italy
Messa in sicurezza di edifici storici
October 31, 2016
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Outline Tectonic summary; Historical seismicity; Seismic sequence; Main event of October 30th, 2016 (Mw 6.5) Conclusion.
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Tectonic summary
The Italian territory is located between African and Eurasia plate. The Apennines’ region was generated by the subduction of the Adria micro-plate (part of African plate) beneath Eurasia
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Tectonic summary
Individual Seismogenic Source for the Central Apennins’ zone (INGV, 2016).
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
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
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Seismic sequence
Seismic sequence in Central Italy from August 24 to October 30.INGV (2016)
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
• Fault mechanism
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (ML 6.5)
Shakemap in the zone close to the epicenter for the main event of 6.5 ML
(INGV, 2016).
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
Recording stations
Epicenter:
Lat: 42.7925 N,
Long: 13.0965 E
(City of Norcia)
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
Station Location Re [km]
NRC Norcia 5.40
ACT Acquasanta Terme 25.90
T1201 Domo 23.30
FOC Colfiorito 27.10
Selected recording stations
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
0
100
200
300
400
500
ACT FOC T1201 NRC
225
371340
465
408
335
467
328
PGA [cm/s2]
PGA ‐ Horizontal Components
E‐W
N‐S
Horizontal peak ground accelerations
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
Vertical peak ground accelerations
0
100
200
300
400
ACT FOC T1201 NRC
229 219 228
352
PGA [cm/s2]
PGA ‐ Vertical Component
U‐D
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
0 50 100 150 200 250 300 350 400
ACT
FOC
T1201
NRC
123.3
164.72
222.62
244.73
INTENSITA' DI ARIAS [CM/S]
N‐S component
Horizontal components of Arias Intensity
0 50 100 150 200 250 300 350 400
ACT
FOC
T1201
NRC
65.87
226.34
90.63
363.55
INTENSITA' DI ARIAS [CM/S]
Ia componenti E‐W
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
0
250
500
750
1000
1250
1500
1750
2000
0 0.5 1 1.5 2 2.5 3 3.5 4
Sa(T) [m/s2]
Periodo [s]
SLC Acquasanta_EW
SLV Acquasanta_NS
Comparison between horizontal spectra and Design Code spectra (SLV and SLC)
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
Comparison between horizontal spectra and Design Code spectra (SLV and SLC)
0
250
500
750
1000
1250
1500
1750
2000
0 0.5 1 1.5 2 2.5 3 3.5 4
Sa(T) [m/s2]
Periodo [s]
SLC Foligno_EW
SLV Foligno_NS
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
Comparison between horizontal spectra and Design Code spectra (SLV and SLC)
0
250
500
750
1000
1250
1500
1750
2000
0 0.5 1 1.5 2 2.5 3 3.5 4
Sa(T) [m/s2]
Periodo [s]
SLC Domo_EW
SLV Domo_NS
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
Comparison between horizontal spectra and Design Code spectra (SLV and SLC)
0
250
500
750
1000
1250
1500
1750
2000
0 0.5 1 1.5 2 2.5 3 3.5 4
Sa(T) [m/s2]
Periodo [s]
SLC Norcia_EW
SLV Norcia_NS
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
0
100
200
300
400
500
0 10 20 30 40 50 60 70 80 90 100 110
PGA [cm/s2]
Distanza Epicentrale [Km]
PGA ATTENUATION
Recorded PGA Log. (Recorded PGA)
PGA attenuation
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
Comparison of the PGA attenuation
0
100
200
300
400
500
0 10 20 30 40 50 60 70 80 90 100 110
PGA [cm/s2]
Distanza Epicentrale [Km]
Comparison of the PGA Attenuation
Regressione Log. Ambraseys 96 (Soft) Log. (Regressione Log.)
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Main event of October 30th, 2016 (Mw 6.5)
PGV attenuation
0
20
40
60
80
100
0 10 20 30 40 50 60 70 80 90 100 110
PGV [cm/s]
Distanza Epicentrale [Km]
PGV Attenuation
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Incomplete shoring up interventionAncient city walls - Norcia
POLITECNICO DI TORINO ‐ DISEG G. P. CIMELLARO
Monastery of Sant’Antonio -NorciaComplete shoring up intervention