Strong ground motion characteristics from 2016 central Italy earthquake sequence

The Central Italy earthquake sequence has, to date, generated three mainshocks: M6.1 24 August, M5.9 26 October, and M6.5 30 October 2016. These events, along with aftershocks, were well recorded by Italian networks, and are among the normal fault earthquakes with the highest number of recordings gl...

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Bibliographic Details
Published in:Earthquake spectra 2018-11, Vol.34 (4), p.1611-1637
Main Authors: Zimmaro, Paolo, Scasserra, Giuseppe, Stewart, Jonathan P, Kishida, Tadahiro, Tropeano, Giuseppe, Castiglia, Massimina, Pelekis, Panagiotis
Format: Article
Language:English
Subjects:
acceleration
accelerometers
active faults
aftershocks
Apennines
attenuation
bedrock
body waves
central Italy
data bases
data processing
earthquakes
elastic waves
Europe
faults
foreshocks
ground motion
instruments
Italy
Monte Vettore-Monte Bove fault system
neotectonics
normal faults
numerical models
peak ground acceleration
peak ground velocity
S-waves
seismic networks
seismic waves
seismographs
Seismology
soils
Southern Europe
strong motion
tectonics
velocity
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Summary:The Central Italy earthquake sequence has, to date, generated three mainshocks: M6.1 24 August, M5.9 26 October, and M6.5 30 October 2016. These events, along with aftershocks, were well recorded by Italian networks, and are among the normal fault earthquakes with the highest number of recordings globally. We process records for six events using procedures developed during the latest Next Generation Attenuation (NGA-West2) project, coordinated by the Pacific Earthquake Engineering Research Center (PEER). Many recording sites lacked VS30 assignments, which we provide using measured shear wave velocity profiles where available and a local geology proxy otherwise. Stations at close distance, including near the hanging wall, exhibit fling step in some cases but no obvious rupture directivity. The data exhibit fast anelastic attenuation at large distances (>100 km), as predicted by recent Italy-adjusted global models, but not by Italy-specific models. We partition residuals from Italy-adjusted global models, finding negative event terms at short periods (weaker than average shaking). We apply Kriging of within-event peak acceleration and velocity residuals using a global semi-variogram model to estimate the spatial distribution of peak accelerations and velocities, which are generally most intense southwest of Mt. Vettore.
ISSN:8755-2930
1944-8201
DOI:10.1193/091817EQS184M