Ground-Motion Simulations for the 1980 M 6.9 Irpinia Earthquake (Southern Italy) and Scenario Events

Ameri, Gabriele; Emolo, Antonio; Pacor, Francesca; Gallovič, František

doi:10.1785/0120100231

Cited by 41 publications

(24 citation statements)

References 64 publications

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“…We remind the reader that this frequency divides the low‐frequency (coherent/deterministic) and high‐frequency (incoherent/stochastic) parts of the simulated wavefield. In other applications [ Gallovič and Brokešová , 2007; Gallovič and Burjánek , 2007; Ameri et al , 2009b; Zollo et al , 2009; Ameri et al , 2011], this range was set up around frequency of 1 Hz. The present application, dealing with stations located basically above the fault, deserves a more careful investigation of the crossover frequency value.…”

Section: Results: Modeling Of Strong Motion Recordsmentioning

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: Results: Modeling Of Strong Motion Recordsmentioning

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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“…The municipalities most severely affected by the earthquake were Castelnuovo di Conza, Conza della Campania, Laviano, Lioni, Sant'Angelo dei Lombardi, Senerchia, Calabritto and Santomenna ( Figure 2). The seismic effects, however, spread to a much wider area affecting practically the entire central part of the southern area of the Italian peninsula [24,25]. Many injuries and collapses also took place in Naples involving many dilapidated or damaged buildings and old dwellings in tuff stones.…”

Section: The 1980 Irpinia Earthquakementioning

confidence: 99%

“…Geosciences 2019, 9, The seismic effects, however, spread to a much wider area affecting practically the entire central part of the southern area of the Italian peninsula [24,25]. Many injuries and collapses also took place in Naples involving many dilapidated or damaged buildings and old dwellings in tuff stones.…”

Section: The 1980 Irpinia Earthquakementioning

confidence: 99%

Geo-Hazard-Based Approach for the Estimation of Seismic Vulnerability and Damage Scenarios of the Old City of Senerchia (Avellino, Italy)

Chieffo

Formisano

2019

Geosciences

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The large-scale seismic risk assessment is a crucial point for safeguarding people and planning adequate mitigation plans in urban areas. The current research work aims at analysing a sector of the historic centre of Senerchia, located in the province of Avellino, in order to assess the seismic vulnerability and damage of old masonry building compounds. First, the typological classification of the inspected building aggregates is developed using the CARTIS form developed by the PLINIVS research centre in collaboration with the Italian Civil Protection Department. The global seismic vulnerability assessment of the building sample is carried out using the macroseismic method according to the EMS-98 scale in order to identify the buildings most susceptible to seismic damage. Furthermore, 12 damage scenarios are developed by means of an appropriate seismic attenuation law. Finally, the expected damage scenarios considering the local hazard effects induced are developed in order to evaluate the damage increment, averagely equal to 50%, due to the seismic amplification of different soil categories.The type of housing is called the "house on a slope". As in the second war, the population did not want to abate the use of building on the rock, even the second housing expansion along the Vallone river saw the buildings erected on the rocky coast [22]. The 1980 Irpinia EarthquakeThe Irpinia earthquake occurred on 23 November 1980 at 7:34 pm. A strong shock (X degree of the Mercalli scale) lasting about 90 s, with a hypocenter of about 12 km depth, striking an area of 17,000 km 2 that extended from Irpinia to Vulture, straddling the provinces of Avellino, Salerno and Potenza [23].The municipalities most severely affected by the earthquake were Castelnuovo di Conza,The type of housing is called the "house on a slope". As in the second war, the population did not want to abate the use of building on the rock, even the second housing expansion along the Vallone river saw the buildings erected on the rocky coast [22].

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“…An empirical estimate of τ F would be useful for engineering seismology in the development of improved seismic-hazard models. In more theoretical studies, it could be considered to help calibrate source models for synthetic ground-motion time series and the variability of those time series (e.g., Ripperger et al, 2008;Ameri et al, 2011;Anderson, 2015).…”

Section: Introductionmentioning

confidence: 99%

Between‐Event Variance for Large Repeating Earthquakes

Yagoda-Biran

Anderson

Koketsu

2015

Bulletin of the Seismological Society of America

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We estimate the variance in ground motions related to repeated large earthquakes occurring on the same fault segment with similar magnitudes. We find eight earthquake pairs for which suitable strong-motion records exist. Two are crustal strike-slip earthquakes from California and six are subduction zone earthquakes from Japan. We consider only large earthquakes and deal with frequencies greater than the earthquake corner frequency, so the variability that is considered here is related to smaller scale differences in the rupture process, particularly on the part of the fault nearest the station. We find that the variance of the 5% damped spectral accelerations of these pairs, termed τ 2 F , averages to about 45% and 80% of τ 2 for the crustal and subduction zone earthquakes, respectively, in which τ 2 is the contribution of source variability to the total variability of ground motion estimated by some recent groundmotion prediction equations. We suggest that τ 2 F is lower than τ 2 , for the frequencies at which τ 2 F is estimated, because it depends primarily on only local physical properties of a fault that are the same in repeated earthquakes. We therefore suggest that at sites where the hazard is controlled by a single rerupturing source, one could potentially use a between-event variance that is smaller than τ 2 in seismic-hazard calculations. Thus, these results may help to resolve the inconsistencies that are now present between the national hazard maps and some precariously balanced rocks in southern California.

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Ground-Motion Simulations for the 1980 M 6.9 Irpinia Earthquake (Southern Italy) and Scenario Events

Cited by 41 publications

References 64 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

Geo-Hazard-Based Approach for the Estimation of Seismic Vulnerability and Damage Scenarios of the Old City of Senerchia (Avellino, Italy)

Between‐Event Variance for Large Repeating Earthquakes

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