3D numerical modelling for interpreting topographic effects in rocky hills for Seismic Microzonation: The case study of Arquata del Tronto hamlet

Primofiore, Ilaria; Baron, Julie; Klin, Peter; Laurenzano, Giovanna; Muraro, Cristina; Capotorti, Franco; Amanti, Marco; Vessia, Giovanna

doi:10.1016/j.enggeo.2020.105868

Cited by 17 publications

(13 citation statements)

References 43 publications

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“…This origin of the site effects was finally verified by Primofiore et al (2020), who set up an updated 3D digital model of the area and evaluated the resulting ground motion by means of 3D numerical simulations of seismic wave propagation. The present work can be therefore considered as a follow up of the analyses by Primofiore et al (2020). In order to provide general results and some new insights with respect to the topography-related site effects, we iterate the numerical evaluation of ground motion for three different versions of the Arquata del Tronto visco-elastic structural model, with growing complexity.…”

Section: Introductionmentioning

confidence: 87%

“…They admitted that 2D analyses cannot fully capture the behavior of such an asymmetric ridge and suggested for this site tridimensional numerical analyses. This origin of the site effects was finally verified by Primofiore et al (2020), who set up an updated 3D digital model of the area and evaluated the resulting ground motion by means of 3D numerical simulations of seismic wave propagation. The present work can be therefore considered as a follow up of the analyses by Primofiore et al (2020).…”

Section: Introductionmentioning

confidence: 87%

“…the pelitic and the arenaceous unit), whereas other two units are considered to describe the overall superficial 20 m thick alteration layer and the gravel deposits at Borgo. Further details regarding the set-up of the 3D geological model are given in Primofiore et al (2020). We illustrate the morphological and lithological characteristics of the area with the four maps in Fig.…”

Section: Geomorphological and Lithological Charactersmentioning

confidence: 99%

“…3 representation of the three input models clipped on the km 2 square area of interest. AdT0 is the homogeneous model, AdT1 is the homogeneous model with a weathering layer and an alluvial, AdT2 is the full 3D model of Arquata del Tronto retrieved from Primofiore et al (2020) We modelled the vertically incident plane waves by placing a horizontal carpet of sources at -400m a.s.l, with an explosive mechanism for the vertically polarized plane wave and West-East or North-South oriented double couple mechanism for the two independent cases of horizontally polarized plane waves, respectively. A set of three simulations is therefore necessary to fully define the 3D response function.…”

Section: Numerical Modelsmentioning

confidence: 99%

“…In order to provide general results and some new insights with respect to the topography-related site effects, we iterate the numerical evaluation of ground motion for three different versions of the Arquata del Tronto visco-elastic structural model, with growing complexity. The first version is characterized by a homogeneous structure, the second one presents near surface alterations (weathering layer and a restricted soil basin over a flat area), and the third one exhibits a complex internal structure and corresponds to the one used in Primofiore et al (2020). The differences between the seismic responses evaluated for each model are then measured in terms of the effect size in three different frequency bands of engineering interest.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Topographic Site Effects using 3D Waveform Modelling: Amplification, Polarization and Torsional Motions in the Case Study of Arquata del Tronto (Italy)

Baron

Primofiore

Klin

et al. 2021

Preprint

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The combined effect of topography and near-surface heterogeneities on the seismic response is hardly predictable and may lead to an aggravation of the ground motion. We apply physics-based numerical simulations of 3D seismic wave propagation to highlight these effects in the case study of Arquata del Tronto, a hamlet in the Apennines that suffered irregularly distributed damage during the 2016 seismic sequence in Central Italy. We analyze the linear visco-elastic seismic response for vertically incident plane waves in terms of spectral amplification, polarization and induced torsional motion within the frequency band 1–8 Hz over a 1 km2 square area, with spatial resolution 25 m. To discern the effects of topography from those of the sub-surface structure we iterate the numerical simulations for three different versions of the structural model: one homogeneous, one with a surficial weathering layer and a soil basin and one with a complex internal structure. The numerical results confirm the correlation between topographic curvature and amplification and support a correlation between the induced torsional motion and the topographic slope. On the other hand we find that polarization does not necessarily imply ground motion amplification. In the frequency band above 4 Hz the topography-related effects are mainly aggravated by the presence of the weathering layer, even though they do not exceed the soil-related effects in the flat-topography basin. The structure below the weathering layer plays a recognizable role in the topography-related site response only for frequencies below 4 Hz.

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 87%

Section: Geomorphological and Lithological Charactersmentioning

confidence: 99%

Section: Numerical Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Topographic Site Effects using 3D Waveform Modelling: Amplification, Polarization and Torsional Motions in the Case Study of Arquata del Tronto (Italy)

Baron

Primofiore

Klin

et al. 2021

Preprint

Self Cite

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Spatial seismic response of non-uniform wide river valley with multistage slopes in lower reaches of Yangtze River

Xiaoxiong,

Haiyang,

Zhaoyan

et al. 2023

Bull Eng Geol Environ

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The seismic microzonation study of Pescara del Tronto (Central Italy) during and after the Central Italy earthquake sequence.

Amanti

Puzzilli

Chiessi

et al. 2020

Bull Earthquake Eng

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Site effects in consequence of the 2016-2018 Central Italy seismic sequence "marked the fate" of many villages located close to the epicenters along the Apennine chain. Pescara del Tronto, a small settlement located on a mountain slope in the municipality of Arquata del Tronto, (AP) is very representative of such territories since, early after the onset of the seismic sequence, suffered very impressive site effects, including a large seismicallyinduced debris flow and a high number of small volume landslides. This paper describes the main results of the scientific activities carried out by the authors in this locality in the framework of the unprecedented large-scale Seismic Microzonation project funded by Italian Government in Central Italy for 138 territories. Through an intense field activity, the geological and geomorphologic setting of the study area were revised and updated, including a landslide susceptibility assessment that helped the Italian Department of Civil Protection in the emergency management for temporary housing and, later on, was included in the 3rd Level Seismic Microzonation study implemented by authors while the seismic sequence was still ongoing. A very detailed and reliable subsoil model for this municipality was defined, despite difficulties faced in performing direct and indirect investigations due to the safety restrictions for many areas. The Local Seismic Site response was finally assessed for this locality and the results discussed. A key role in the occurrence of strong site effects into Pescara del Tronto has been played by quaternary deposits having an unexpected heterogeneity under the old village.

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3D numerical modelling for interpreting topographic effects in rocky hills for Seismic Microzonation: The case study of Arquata del Tronto hamlet

Cited by 17 publications

References 43 publications

Investigation of Topographic Site Effects using 3D Waveform Modelling: Amplification, Polarization and Torsional Motions in the Case Study of Arquata del Tronto (Italy)

Investigation of Topographic Site Effects using 3D Waveform Modelling: Amplification, Polarization and Torsional Motions in the Case Study of Arquata del Tronto (Italy)

Spatial seismic response of non-uniform wide river valley with multistage slopes in lower reaches of Yangtze River

The seismic microzonation study of Pescara del Tronto (Central Italy) during and after the Central Italy earthquake sequence.

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