Hybrid k-squared source model for strong ground motion simulations: Introduction

Gallovič, František; Brokešová, Johana

doi:10.1016/j.pepi.2006.09.002

Cited by 44 publications

(45 citation statements)

References 36 publications

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“…In this work we use three well-known simulation methods: the stochastic finite-fault simulation code (EXSIM, Motazedian and Atkinson, 2005;Boore, 2009), the hybrid deterministic-stochastic approach with approximated Green's functions (DSM, Pacor et al, 2005), and the broadband hybrid integral-composite technique with full-wavefield Green's functions (HIC, Gallovič and Brokešová, 2007). Table 1 summarizes the main characteristics of each technique in terms of source and path parameters; Table 2 reports the input modeling parameters later described.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…These methods are able to generate realistic seismograms in the frequency band of engineering concern, close to the causative fault (e.g., Zollo et al, 1997;Mai and Beroza, 2003;Motazedian and Atkinson, 2005;Pacor et al, 2005;Gallovič and Brokešová, 2007;) and can be used to perform earthquake scenarios studies (Aagaard et al, 2008;Ameri et al, 2008;Cultrera et al, 2010). However, these methods are generally considered as advanced tools in hazard assessment framework, because compared with GMPEs, they require a larger number of seismological data about the earthquake source and the propagation medium, which are often uncertain.…”

Section: Introductionmentioning

confidence: 99%

“…Some examples can be found in Convertito et al (2006), Sørensen et al (2007), Gallovič and Burjánek (2007), Gallovič and Brokešová (2007), Ansal et al (2008), Ameri et al (2008), Emolo et al (2008), Cultrera et al (2009), andPitarka (2010).…”

Section: Introductionmentioning

confidence: 99%

“…

Abstract In this paper, we adopt three ground-motion simulation techniques (the stochastic finite-fault simulation code from Motazedian and Atkinson, 2005; the hybrid deterministic-stochastic approach with approximated Green's functions from Pacor et al, 2005; and the broadband hybrid integral-composite technique with full-wavefield Green's functions from Gallovič and Brokešová, 2007), with the aim of investigating the different performances in near-fault strong-motion modeling and prediction from past and future events. The test case is the 1980 M 6.9 Irpinia earthquake, the strongest event recorded in Italy in the last 30 years.

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confidence: 99%

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

Ameri

Emolo

Pacor

et al. 2011

Bulletin of the Seismological Society of America

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In this paper, we adopt three ground-motion simulation techniques (the stochastic finite-fault simulation code from Motazedian and Atkinson, 2005; the hybrid deterministic-stochastic approach with approximated Green's functions from Pacor et al., 2005; and the broadband hybrid integral-composite technique with full-wavefield Green's functions from Gallovič and Brokešová, 2007), with the aim of investigating the different performances in near-fault strong-motion modeling and prediction from past and future events. The test case is the 1980 M 6.9 Irpinia earthquake, the strongest event recorded in Italy in the last 30 years. First, we simulate the recorded strong-motion data and validate the model parameters by computing spectral acceleration and peak amplitude residual distributions. The validated model is then used to investigate the influence of site effects and to compute synthetic ground motions around the fault. Afterward, we simulate the expected ground motions from scenario events on the Irpinia fault, varying the hypocenters, the rupture velocities, and the slip distributions. We compare the median ground motions and related standard deviations from all scenario events with empirical ground-motion prediction equations (GMPEs). The synthetic median values are included in the median 1 standard deviation of the considered GMPEs. Synthetic peak ground accelerations show median values smaller and with a faster decay with distance than the empirical ones. The synthetics total standard deviation is of the same order or smaller than the empirical one, and it shows considerable differences from one simulation technique to another. We decomposed the total standard deviation into its between-scenario and within-scenario components. The larger contribution to the total sigma comes from the latter, while the former is found to be smaller and in good agreement with empirical interevent variability.Online Material: Comparison of observed and simulated waveforms and spectra.

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Section: Simulation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…

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mentioning

confidence: 99%

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

Ameri

Emolo

Pacor

et al. 2011

Bulletin of the Seismological Society of America

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“…Realistic slip models along the faults were obtained either by source inversion of real earthquakes with similar fault mechanisms or they were computed using a selfsimilar k-square model (Herrero and Bernard 1994;Gallovič and Brokešová 2007). Twelve rupture scenarios are produced along the Ferrara fault (May 20) and eleven are activated along the Mirandola fault (May 29).…”

Section: Ground Shaking Scenarios In the Po Plainmentioning

confidence: 99%

Physics-Based Earthquake Ground Shaking Scenarios in Large Urban Areas

Paolucci

Mazzieri

Smerzini

et al. 2014

Geotechnical, Geological and Earthquake Engineering

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With the ongoing progress of computing power made available not only by large supercomputer facilities but also by relatively common workstations and desktops, physics-based source-to-site 3D numerical simulations of seismic ground motion will likely become the leading and most reliable tool to construct ground shaking scenarios from future earthquakes. This paper aims at providing an overview of recent progress on this subject, by taking advantage of the experience gained during a recent research contract between Politecnico di Milano, Italy, and Munich RE, Germany, with the objective to construct ground shaking scenarios from hypothetical earthquakes in large urban areas worldwide. Within this contract, the SPEED computer code was developed, based on a spectral element formulation enhanced by the Discontinuous Galerkin approach to treat non-conforming meshes. After illustrating the SPEED code, different case studies are overviewed, while the construction of shaking scenarios in the Po river Plain, Italy, is considered in more detail. Referring, in fact, to this case study, the comparison with strong motion records allows one to derive some interesting considerations on the pros and on the present limitations of such approach.

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Diminishing high‐frequency directivity due to a source effect: Empirical evidence from small earthquakes in the Abruzzo region, Italy

Pacor

Gallovič

Puglia

et al. 2016

Geophysical Research Letters

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The aim of this study is to investigate the directivity effects of ~250 aftershocks (magnitudes 3–5.5) of the Mw 6.1 2009 L'Aquila earthquake (central Italy). To this end, we estimate the apparent source spectra at each station removing path and site effects inferred by standard Generalized Inversion Technique. Then, we evaluate the residuals between the apparent source spectra and the event mean source spectrum at selected frequencies. We investigate azimuthal and frequency dependence of the residuals for 40 events with the best station coverage. For most of events with the strongest directivity effect (Mw 3.4–4.0), we observe a remarkable decrease of the directivity amplification at high frequencies, which has not yet been documented for such relatively small‐magnitude events. Since there is negligible distance dependence, we ascribe this observation to a source phenomenon such as significant small‐scale rupture propagation complexity.

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Hybrid k-squared source model for strong ground motion simulations: Introduction

Cited by 44 publications

References 36 publications

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

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

Physics-Based Earthquake Ground Shaking Scenarios in Large Urban Areas

Diminishing high‐frequency directivity due to a source effect: Empirical evidence from small earthquakes in the Abruzzo region, Italy

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