The L’Aquila earthquake—A view of site effects and building behavior from temporary networks

Cultrera, Giovanna; Mucciarelli, Marco; Parolai, Stefano

doi:10.1007/s10518-011-9270-6

Cited by 11 publications

(4 citation statements)

References 10 publications

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“…In particular, the site response characterization of stations in the epicentral area largely benefited from several research activities carried out after the earthquake, described by Gruppo di Lavoro M.S.‐A.Q. [2010] and Cultrera et al [2011]. An overview on site responses of the accelerometric sites, based on the analysis of strong motion recordings, is found in the work of Bindi et al [2009].…”

Section: Introductionmentioning

confidence: 99%

Complexity of the Mw 6.3 2009 L'Aquila (central Italy) earthquake: 2. Broadband strong motion modeling

Ameri¹,

Gallovič²,

Pacor³

2012

J. Geophys. Res.

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[1] Near-fault strong-ground motions (0.1-10 Hz) recorded during the Mw 6.3 2009 L'Aquila earthquake exhibit great spatial variability. Modeling the observed seismograms allows linking distinct features of the observed wavefield to particular source and propagation effects and provides insights on strong motion complexity from this moderate magnitude event. We utilize a hybrid integral-composite approach based on a k-square kinematic rupture model, combining low-frequency coherent and high-frequency incoherent source radiation and providing omega-squared source spectral decay. Several source model features, proven to be stable by means of an uncertainty analysis in the preceding low-frequency (<0.2 Hz) multiple finite-extent source inversion (Paper 1), were constrained. Synthetic Green's functions are calculated in a 1D-layered crustal model including 1D soil profiles to account for site-specific response (where available). The results show that although the local site effects improve the modeling, the spatial broadband ground-motion variability is to large extent controlled by the rupture kinematics. The modeling thus confirms and further constraints the source model features, including the position and slip amount of the two main asperities, the largest asperity time delay and the rupture velocity distribution on the fault. Furthermore, we demonstrate that the crossover frequency dividing the coherent and incoherent wavefield, often considered independent on the station position, has to be variable in order to adequately reproduce both near and far station recordings. This suggests that the incoherency of the radiated wavefield is controlled by the wave-propagation phenomena and/or the initial updip rupture propagation was very smooth (coherent) up to relatively high frequencies (>2 Hz).

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Section: Introductionmentioning

confidence: 99%

Complexity of the Mw 6.3 2009 L'Aquila (central Italy) earthquake: 2. Broadband strong motion modeling

Ameri¹,

Gallovič²,

Pacor³

2012

J. Geophys. Res.

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“…In the following months, the network geometry was reorganized according to different needs. Stations devoted to site response investigations were moved to areas of particular interest for the Civil Protection, to collect data that would be useful for seismic microzonation studies [Cultrera et al 2011]. Stations devoted to earthquake location were reorganized according to their availability, to better follow the temporal and spatial evolution of the seismic sequence [Margheriti et al 2010].…”

Section: The L'aquila Earthquake Emergencymentioning

confidence: 99%

Rapid response seismic networks in Europe: lessons learnt from the L'Aquila earthquake emergency

Margheriti

Chiaraluce

Cultrera

et al. 2011

Annals of Geophysics

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The largest dataset ever recorded during a normal fault seismic sequence was acquired during the 2009 seismic emergency triggered by the damaging earthquake in L'Aquila (Italy). This was possible through the coordination of different rapid-response seismic networks in Italy, France and Germany. A seismic network of more than 60 stations recorded up to 70,000 earthquakes. Here, we describe the different open-data archives where it is possible to find this unique set of data for studies related to hazard, seismotectonics and earthquake physics. Moreover, we briefly describe some immediate and direct applications of emergency seismic networks. At the same time, we note the absence of communication platforms between the different European networks. Rapid-response networks need to agree on common strategies for network operations. Hopefully, over the next few years, the European Rapid-Response Seismic Network will became a reality.

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“…As local geological conditions can contribute to significant amplification of the seismic ground motions (even up to 10 times or more), the detailed estimation of the variability of site response is a crucial step in a sitespecific seismic hazard assessment (e.g. Cultrera et al 2011;Assimaki et al 2012;Mayoral et al 2019). The most reliable techniques to reconstruct site amplification are methods based on ground-motion observations, such as the standard spectral ratio method (SSR, Borcherdt 1970) or the generalized inversion scheme (GIT, e.g.…”

Section: Introductionmentioning

confidence: 99%

Mapping site amplification with the dense recording of ambient vibration for the city of Lucerne (Switzerland) – comparison between two approaches

Janusz,

Panzera,

Bergamo

et al. 2024

Preprint

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Reliable site-specific amplification information can be retrieved using earthquake-based methods, involving the deployment of seismic networks, which, however, may need to operate for years. Hence, time- and cost-effective approaches using ambient vibrations are gaining popularity. Among such techniques, the hybrid standard spectral ratio method (SSRh) uses simultaneous recordings of ambient vibrations translated into a prediction of local seismic response with a limited number of instrumented sites with earthquake ground-motion data. The canonical correlation approach (CC) collates measured empirical amplification with its proxy computed from ambient vibrations (horizontal-to-vertical spectral ratios, HVSRn) at a training set of seismic stations, to predict site response at points without earthquake recordings. We apply both methods in the Lucerne area (Switzerland), located on a soft sedimentary basin, obtaining consistent results, comparable to amplification estimates from earthquake ground motions. The resulting linear amplification factors are significant (factor of 8–10 or more) at the fundamental frequency of resonance of the sediments (0.8-2 Hz). However, both techniques show systematic differences in the spatial and frequency domains. The CC method tends to underestimate the amplification at the fundamental frequency, while SSRh predicts higher amplification factors in the center and lower at the basin edges in comparison to the CC approach. The study discusses the impact of limited completeness of the calibration dataset, and variability introduced by factors like Vs30 model choice and inelastic behavior treatment for the CC method, as well as the influence of the measurement setup for the SSRh method.

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The L’Aquila earthquake—A view of site effects and building behavior from temporary networks

Cited by 11 publications

References 10 publications

Complexity of the Mw 6.3 2009 L'Aquila (central Italy) earthquake: 2. Broadband strong motion modeling

Complexity of the Mw 6.3 2009 L'Aquila (central Italy) earthquake: 2. Broadband strong motion modeling

Rapid response seismic networks in Europe: lessons learnt from the L'Aquila earthquake emergency

Mapping site amplification with the dense recording of ambient vibration for the city of Lucerne (Switzerland) – comparison between two approaches

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