Local Seismic Response in the Southern Part of the Historic Centre of L’Aquila

2014 ◽  
pp. 1097-1100 ◽  
Author(s):  
Sara Amoroso ◽  
Ferdinando Totani ◽  
Gianfranco Totani ◽  
Paola Monaco
Keyword(s):  
Seismic Response ◽  
Local Seismic Response ◽  
Historic Centre

Are Synthetic Accelerograms Suitable for Local Seismic Response Analyses at Near-Field Sites?

2021 ◽  
Author(s):  
Francesca Mancini ◽  
Sebastiano D’Amico ◽  
Giovanna Vessia
Keyword(s):  
Seismic Response ◽  
Seismic Waves ◽  
Near Field ◽  
Central Italy ◽  
Propagation Path ◽  
Soil Behavior ◽  
Seismic Stations ◽  
Seismic Input ◽  
Local Seismic Response ◽  
Finite Fault

ABSTRACT Local seismic response (LSR) studies are considerably conditioned by the seismic input features due to the nonlinear soil behavior under dynamic loading and the subsurface site conditions (e.g., mechanical properties of soils and rocks and geological setting). The selection of the most suitable seismic input is a key point in LSR. Unfortunately, few recordings data are available at seismic stations in near-field areas. Then, synthetic accelerograms can be helpful in LSR analysis in urbanized near-field territories. Synthetic accelerograms are generated by simulation procedures that consider adequately supported hypotheses about the source mechanism at the seismotectonic region and the wave propagation path toward the surface. Hereafter, mainshocks recorded accelerograms at near-field seismic stations during the 2016–2017 Central Italy seismic sequence have been compared with synthetic accelerograms calculated by an extended finite-fault ground-motion simulation algorithm code. The outcomes show that synthetic seismograms can reproduce the high-frequency content of seismic waves at near-field areas. Then, in urbanized near-field areas, synthetic accelerograms can be fruitfully used in microzonation studies.

scholarly journals Physical stratigraphy and geotechnical properties controlling the local seismic response in explosive volcanic settings: the Stracciacappa maar (central Italy)

2020 ◽  
Vol 80 (1) ◽  
pp. 179-199
Author(s):  
M. Moscatelli ◽  
G. Vignaroli ◽  
A. Pagliaroli ◽  
R. Razzano ◽  
A. Avalle ◽  
...  
Keyword(s):  
Seismic Response ◽  
Ground Motion ◽  
Central Italy ◽  
Volcanic Event ◽  
Ground Motion Amplification ◽  
Local Seismic Response ◽  
Single Station ◽  
Seismic Scenarios ◽  
Physical Stratigraphy ◽  
Subsoil Model

AbstractNowadays, policies addressed to prevention and mitigation of seismic risk need a consolidated methodology finalised to the assessment of local seismic response in explosive volcanic settings. The quantitative reconstruction of the subsoil model provides a key instrument to understand how the geometry and the internal architecture of outcropping and buried geological units have influence on the propagation of seismic waves. On this regard, we present a multidisciplinary approach in the test area of the Stracciacappa maar (Sabatini Volcanic District, central Italy), with the aim to reconstruct its physical stratigraphy and to discuss how subsoil heterogeneities control the 1D and 2D local seismic response in such a volcanic setting. We first introduce a new multidisciplinary dataset, including geological (fieldwork and log from a 45-m-thick continuous coring borehole), geophysical (electrical resistivity tomographies, single station noise measurements, and 2D passive seismic arrays), and geotechnical (simple shear tests performed on undisturbed samples) approaches. Then, we reconstruct the subsoil model for the Stracciacappa maar in terms of vertical setting and distribution of its mechanical lithotypes, which we investigate for 1D and 2D finite element site response analyses through the application of two different seismic scenarios: a volcanic event and a tectonic event. The numerical modelling documents a significant ground motion amplification (in the 1–1.5 Hz range) revealed for both seismic scenarios, with a maximum within the centre of the maar. The ground motion amplification is related to both 1D and 2D phenomena including lithological heterogeneity within the upper part of the maar section and interaction of direct S-waves with Rayleigh waves generated at edges of the most superficial lithotypes. Finally, we use these insights to associate the expected distribution of ground motion amplification with the physical stratigraphy of an explosive volcanic setting, with insights for seismic microzonation studies and local seismic response assessment in populated environments.

The Uncertainty in the Local Seismic Response Analysis

2008 ◽  
Author(s):  
A. Pasculli ◽  
A. Pugliese ◽  
R. W. Romeo ◽  
T. Sanò ◽  
Adolfo Santini ◽  
...  
Keyword(s):  
Seismic Response ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Local Seismic Response

scholarly journals Use of Synthetic Accelerograms in Local Seismic Response Analyses at Near Field Sites

2021 ◽  
Author(s):  
Francesca Mancini ◽  
Giovanna Vessia ◽  
Sebastiano D'Amico
Keyword(s):  
Seismic Response ◽  
Near Field ◽  
Local Seismic Response

Reconstruction of a Reference Subsoil Model for the Seismic Microzonation of Gori (Georgia): A Procedure Based on Principal Component Analysis (PCA)

2021 ◽  
Author(s):  
Silvia Giallini ◽  
Enrico Paolucci ◽  
Pietro Sirianni ◽  
Dario Albarello ◽  
Iolanda Gaudiosi ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Seismic Response ◽  
Principal Component ◽  
Component Analysis ◽  
Vibration Monitoring ◽  
Ambient Vibration ◽  
Geological Evidence ◽  
Local Seismic Response ◽  
Geophysical Surveys ◽  
Single Station

ABSTRACT This article focuses on the full exploitation of geological and economically viable geophysical surveys for the seismic characterization of the shallow subsoil in the frame of microzonation studies in urban areas where economic resources for detailed seismic response analyses are scarce. In these conditions, the outcomes of inexpensive geophysical surveys (e.g., based on ambient vibration monitoring or surface-wave prospecting) must be fully exploited. To reduce the uncertainties related to these kinds of procedures, their joint interpretation in the light of geological evidence is mandatory. To this purpose, we propose the application of principal component analysis to combine the results of distributed single-station ambient vibration measurements (horizontal-to-vertical spectral ratio [HVSR] technique) to provide a preliminary zonation of the study area. The zones identified in this way are then characterized by considering the available geognostic boreholes, VS profiles deduced by the joint inversion of HVSR curves, and available Rayleigh-wave dispersion curves deduced from active seismic prospecting (multichannel analysis of surface-waves technique). The final outcome allows the definition of a preliminary seismic model of the study area, which is also constrained by the available geological data deduced from on-purpose surveys. The proposed approach has been applied to the city of Gori (Georgia). The proposed approach allowed a reliable assessment of buried geometries, geological domains, and the distribution of lithofacies, which can control the local seismic response. In detail, the major role of paleovalley infills and interfluve domains has been enlightened by adding in evidence concerning the peculiar stratigraphic relationships and buried morphologies, which may determine 1D and 2D resonance effects.

Local Seismic Response in a Large Intra-mountain Basin as Observed from Earthquakes and Microtremor Recordings: The Avezzano Area (Central Italy)

2014 ◽  
pp. 1153-1157 ◽  
Author(s):  
Daniela Famiani ◽  
Paolo Boncio ◽  
Fabrizio Cara ◽  
Rocco Cogliano ◽  
Giuseppe Di Giulio ◽  
...  
Keyword(s):  
Seismic Response ◽  
Central Italy ◽  
Local Seismic Response

Vrancea Source Influence on Local Seismic Response in Bucharest

2001 ◽  
Vol 158 (12) ◽  
pp. 2407-2429 ◽  
Author(s):  
C. L. Moldoveanu ◽  
G. F. Panza
Keyword(s):  
Seismic Response ◽  
Local Seismic Response
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