Publication Date:
2017-04-04
Description:
On 6 April 2009, an earthquake of Mw 6:13 (Herrmann et al., 2011)
occurred in central Italy, close to the town of L’Aquila. Although the earthquake
is considered to be a moderate-size event, it caused extensive damage to the surrounding area. The earthquake is identified with significant directivity effects: highamplitude, short-duration motions are observed at the stations that are oriented along
the rupture direction, whereas low-amplitude, long-duration motions are observed at
the stations oriented in the direction opposite to the rupture. The complex nature of the
earthquake combined with its damage potential brings the need for studies that assess
the seismological characteristics of the 2009 L’Aquila mainshock.
In this study, we present the strong-ground-motion simulation of this particular
earthquake using a stochastic finite-fault model with a dynamic corner frequency approach. For modeling the resulting ground motions, we choose two finite-fault source
models that take into account the source complexity of the L’Aquila mainshock. In
order to test the sensitivity of ground-motion parameters to the seismic wave attenuation parameters, we use two different attenuation models obtained in the study region
using weak-motion and strong-motion databases. Comparisons are made between the
attenuation of synthetics and ground-motion prediction equations (GMPEs). Synthetic
ground motions are further compared with the observed ones in terms of Fourier
amplitude and response spectra at 21 strong-ground-motion stations that recorded
the mainshock within an epicentral distance of 100 km. The spatial distribution of
shaking intensity obtained from the “Did You Feel It?” project and site survey results
are compared with the spatial distributions of simulated peak ground-motion intensity
parameters. Our results show that despite the limitations of the method in simulating
the directivity effects, the stochastic finite-fault model seems an effective and fast tool
to simulate the high-frequency portion of ground motion.
Description:
Published
Description:
1429-1445
Description:
4.1. Metodologie sismologiche per l'ingegneria sismica
Description:
JCR Journal
Description:
restricted
Keywords:
2009 L'Aquila sequence
;
strong ground motion simulations
;
04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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