Site effects observed in alluvial basins: the case of Norcia (Central Italy)

2011 ◽  
Vol 9 (6) ◽  
pp. 1941-1959 ◽  
Author(s):  
D. Bindi ◽  
L. Luzi ◽  
S. Parolai ◽  
D. Di Giacomo ◽  
G. Monachesi
Keyword(s):  
Site Effects ◽  
Central Italy

scholarly journals Near-Source Simulation of Strong Ground Motion in Amatrice Downtown Including Site Effects

Geosciences ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 186
Author(s):  
Alessandro Todrani ◽  
Giovanna Cultrera
Keyword(s):  
Ground Motion ◽  
Site Effects ◽  
Central Italy ◽  
Strong Motion ◽  
Seismic Source ◽  
Spectral Ratio ◽  
Intensity Measures ◽  
Standard Spectral Ratio ◽  
Heavy Damage ◽  
Strong Ground

On 24 August 2016, a Mw 6.0 earthquake started a damaging seismic sequence in central Italy. The historical center of Amatrice village reached the XI degree (MCS scale) but the high vulnerability alone could not explain the heavy damage. Unfortunately, at the time of the earthquake only AMT station, 200 m away from the downtown, recorded the mainshock, whereas tens of temporary stations were installed afterwards. We propose a method to simulate the ground motion affecting Amatrice, using the FFT amplitude recorded at AMT, which has been modified by the standard spectral ratio (SSR) computed at 14 seismic stations in downtown. We tested the procedure by comparing simulations and recordings of two later mainshocks (Mw 5.9 and Mw 6.5), underlining advantages and limits of the technique. The strong motion variability of simulations was related to the proximity of the seismic source, accounted for by the ground motion at AMT, and to the peculiar site effects, described by the transfer function at the sites. The largest amplification characterized the stations close to the NE hill edge and produced simulated values of intensity measures clearly above one standard deviation of the GMM expected for Italy, up to 1.6 g for PGA.

Site effects and damage scenarios: The case study of two historic centers following the 2016 Central Italy earthquake

2020 ◽  
Vol 272 ◽  
pp. 105647 ◽  
Author(s):  
Giuseppe Brando ◽  
Alessandro Pagliaroli ◽  
Giulia Cocco ◽  
Francesco Di Buccio
Keyword(s):  
Site Effects ◽  
Central Italy ◽  
Damage Scenarios ◽  
Central Italy Earthquake

scholarly journals Local Site Effects and Incremental Damage of Buildings during the 2016 Central Italy Earthquake Sequence

2018 ◽  
Vol 34 (4) ◽  
pp. 1639-1669 ◽  
Author(s):  
Anastasios Sextos ◽  
Raffaele De Risi ◽  
Alessandro Pagliaroli ◽  
Sebastiano Foti ◽  
Federico Passeri ◽  
...  
Keyword(s):  
Site Effects ◽  
Seismic Waves ◽  
Central Italy ◽  
Lessons Learned ◽  
Earthquake Sequence ◽  
Topographic Effects ◽  
Local Site Effects ◽  
Central Italy Earthquake ◽  
Local Site ◽  
Sequence Of Events

The Central Italy earthquake sequence initiated on 24 August 2016 with a moment magnitude M6.1 event, followed by two earthquakes (M5.9 and M6.5) on 26 and 30 October, caused significant damage and loss of life in the town of Amatrice and other nearby villages and hamlets. The significance of this sequence led to a major international reconnaissance effort to thoroughly examine the effects of this disaster. Specifically, this paper presents evidences of strong local site effects (i.e., amplification of seismic waves because of stratigraphic and topographic effects that leads to damage concentration in certain areas). It also examines the damage patterns observed along the entire sequence of events in association with the spatial distribution of ground motion intensity with emphasis on the clearly distinct performance of reinforced concrete and masonry structures under multiple excitations. The paper concludes with a critical assessment of past retrofit measures efficiency and a series of lessons learned as per the behavior of structures to a sequence of strong earthquake events.

scholarly journals Different damage observed in the villages of Pescara del Tronto and Vezzano after the M6.0 August 24, 2016 central Italy earthquake and site effects analysis

2017 ◽  
Vol 59 ◽  
Author(s):  
Angelo Masi ◽  
Giuseppe Santarsiero ◽  
Leonardo Chiauzzi ◽  
Maria Rosaria Gallipoli ◽  
Sabatino Piscitelli ◽  
...  
Keyword(s):  
Site Effects ◽  
Central Italy ◽  
Masonry Building ◽  
Light Damage ◽  
Central Italy Earthquake ◽  
Geophysical Investigations ◽  
Heavy Damage ◽  
Different Levels

<p>The authors have surveyed many damaged villages located at the epicentre of the ML=6.0 earthquake which occurred on August 24, 2016 in central Italy. Some unexpected anomalies were discovered such as very different levels of damage in Vezzano and Pescara del Tronto villages (Arquata del Tronto Municipality, Ascoli Piceno province). The two villages are situated just 1300 meters from each other. Pescara del Tronto suffered very heavy damage with many masonry building collapses and 48 fatalities, while Vezzano suffered only light damage to few buildings. This paper provides a preliminar analysis from an engineering and geophysics perspective. Particularly, rapid visual surveys were carried out in the two villages in order to detect possible significant differences in the vulnerability of their building stocks and site geophysical investigations were performed to detect possible local amplification effects.</p>

Site effects and widespread susceptibility to permanent coseismic deformation in the Avezzano town (Fucino basin, Central Italy): Constraints from detailed geological study

2020 ◽  
Vol 270 ◽  
pp. 105583
Author(s):  
Deborah Di Naccio ◽  
Daniela Famiani ◽  
Francesca Liberi ◽  
Paolo Boncio ◽  
Fabrizio Cara ◽  
...  
Keyword(s):  
Site Effects ◽  
Central Italy ◽  
Coseismic Deformation ◽  
Fucino Basin

Local site effects estimation at Amatrice (Central Italy) through seismological methods

2019 ◽  
Vol 18 (12) ◽  
pp. 5713-5739 ◽  
Author(s):  
G. Milana ◽  
G. Cultrera ◽  
P. Bordoni ◽  
A. Bucci ◽  
F. Cara ◽  
...  
Keyword(s):  
Site Effects ◽  
Central Italy ◽  
Local Site Effects ◽  
Local Site

Local Seismic site effects estimated by detailed seismic surveys: the case of Castelnuovo village (L’Aquila Basin, central Italy)

2021 ◽  
Author(s):  
Marco Spadi ◽  
Marco Tallini ◽  
Matteo Albano ◽  
Domenico Cosentino ◽  
Marco Nocentini ◽  
...  
Keyword(s):  
Cross Sections ◽  
Site Effects ◽  
Dynamic Properties ◽  
Central Italy ◽  
Earthquake Hazard ◽  
Small Scale ◽  
Seismic Site Effects ◽  
New Findings ◽  
Subsoil Model ◽  
Observed Damage

&lt;p&gt;Assessing seismic site effects is essential in earthquake hazard studies. Local seismic amplification is strongly related to the site stratigraphy and topography, the dynamic properties of the subsoil deposits, and the earthquake features. The evaluation of these factors is mandatory to achieve a consistent model of the seismic hazard at small scale. Here we discuss the case of Castelnuovo village (L&amp;#8217;Aquila, central Italy). Located on a small ridge, approximately 60 m higher than the valley floor, the village was heavily struck by April 6, 2009, M&lt;sub&gt;w&lt;/sub&gt; 6.3 L&amp;#8217;Aquila earthquake, with catastrophic collapse of several buildings. Previous studies ascribed the observed damage to the presence of shallow caves beneath the buildings or to the topographic amplification.&lt;/p&gt;&lt;p&gt;In this work, an updated and detailed subsoil model for Castelnuovo site has been provided, based updated geological surveys, such as borehole logs and geophysical data consisting in microtremor measurements and down-hole.&lt;/p&gt;&lt;p&gt;These measurements identified resonant frequencies occurring in the range of 0.7-3.0 Hz. These frequency peaks are related to the presence of a velocity contrast at depth between the San Nicandro silts and the Madonna della Neve breccias, as indicated by the performed deep boreholes. Thanks to analytical, numerical, and geostatistical techniques, we identified the main impedance contrast at approximately 210 m depth from the top of the hill, much deeper than previous studies. These new findings allowed to create an accurate and consistent subsoil model summarized by two geological cross-sections of the Castelnuovo ridge, showing that the seismic site effects at the Castelnuovo village are mainly related to stratigraphic amplification.&lt;/p&gt;

Evaluation of site effects at Amatrice (central Italy) after the August 24th, 2016, Mw 6.0 earthquake

2021 ◽  
Vol 144 ◽  
pp. 106699
Author(s):  
Iolanda Gaudiosi ◽  
Maurizio Simionato ◽  
Marco Mancini ◽  
Gian Paolo Cavinato ◽  
Monia Coltella ◽  
...  
Keyword(s):  
Site Effects ◽  
Central Italy
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