Seismic microzoning of the area struck by Umbria–Marche (Central Italy) Ms 5.9 earthquake of 26 September 1997

Pergalani, F.; Romeo, Roberto; Luzi, Lucia; Petrini, V.; Pugliese, Antonio; Sanò, T.

doi:10.1016/s0267-7261(99)00003-2

Cited by 38 publications

(16 citation statements)

References 2 publications

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“…SAs can be related to the MCS macroseismic intensity (I MCS ) using the available period dependent regression (Faenza and Michelini 2011) while SI has been evaluated since it has been recently considered a very effective parameter to correlate the severity of seismic events with building structural damage (Pergalani et al 1999;Masi et al 2010;Chiauzzi et al 2012). For SI both I MCS and European Macroseismic Scale-EMS98 intensity (I EMS , Grünthal 1998) are evaluated.…”

Section: Can Sms Reflections and Multiples Cause Damage In And Aroundmentioning

confidence: 99%

On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence

Sugan

Vuan

2013

Bull Earthquake Eng

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It has been observed that post-critically reflected S-waves and multiples from the Moho discontinuity could play a relevant role on the ground motion due to medium to strong size earthquakes away from the source. Although some studies investigated the correlation between the Moho reflections amplitudes and the damage in the far field, little attention was given to the frequency content of these specific phases and their scaling with magnitude. The 2012 Emilia seismic sequence in northern Italy, recorded by velocimetric and accelerometric networks, is here exploited to investigate Moho reflections and multiples (SmSM). A single station method for group velocity-period estimation, based on the multiple filter technique, is applied to strong motion data to detect SmSM. Amplitude and frequency scaling with magnitude is defined for earthquakes from Mw = 3.9 to Mw = 5.9. Finally, the ability of SmSM to affect the ground motion for a maximum credible earthquake within the Po plain is investigated by extrapolating observed engineering parameters. Data analysis shows that high amplitude SmSM can be recognized within the Po plain, and at the boundaries between the Po plain and the Alpine chain, at epicentral distances larger than 80 km, in the period range from 0.25 to 3 s and in the group velocity window from about 2.6 to 3.2 km/s. 5 % damped pseudo-spectral accelerations at different periods (0.3, 1.0 and 2.0 s), and Housner intensities, are obtained from data characterized by large amplitude SmSM. A scaling relationship for both pseudo-spectral accelerations and Housner intensities is found for the earthquakes of the 2012 Emilia seismic sequence. I MCS from VII to VIII is estimated, as a result of SmSM amplitude enhancement, at about 100 km for a maximum credible earthquake (Mw = 6.7) in the Po plain, showing that moderate to high damage cloud be caused by these specific phases.

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Section: Can Sms Reflections and Multiples Cause Damage In And Aroundmentioning

confidence: 99%

On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence

Sugan

Vuan

2013

Bull Earthquake Eng

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“…The value of SI was determined as the integral of the spectral ordinates of pseudovelocity at 5% critical damping in the 2-10 Hz range; this range is assumed to be representative of the main periods of the building type in the investigated area (Pergalani et al, 1999).…”

Section: Remarks On Seismic Amplification In Fault Zonesmentioning

confidence: 99%

Evidence of Amplification Effects in Fault Zone Related to Rock Mass Jointing

et al. 2006

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Results of geological, geomechanical and seismometric investigations aiming at the analysis of the seismic response in a carbonate ridge of the Nera River valley (Central Apennines -Italy) are discussed. Geological and geomechanical surveys were aimed at defining the stratigraphic and structural setting of the outcropping formations and the jointing conditions of the rock mass. Velocimetric records of both ambient noise and small-magnitude earthquakes were analysed in order to identify amplification conditions. The analysis was carried out in the time domain, through directional energy evaluation, and in the frequency domain, through H/V spectral ratios and spectral ratios with respect to a reference station. A local amplification factor was estimated from Housner intensity. The study revealed a significant seismic amplification in a fault zone. This effect was observed in intensely jointed and mylonitic rock masses, located inside moderately jointed rock masses, and is the result of specific geometries and significant impedance contrasts. A map of fault zones prone to amplification of ground motion was constructed, taking into account the jointing conditions of the rock masses and the structural setting of the investigated ridge. The study relied on an integrated methodological approach, which combined the available data under union and intersection criteria.

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“…Although the main shocks did not exceed M w 6, severe building loss was caused by the strong ground motion amplification at several sites (TERTULLIANI, 1999). A number of microzonation studies were encouraged by the local government to promote safer building reconstruction and retrofit (PERGALANI et al, 1999;MARCELLINI et al, 2001). The most significant site-effect cases have been investigated by several authors (SANO`et al, 1998;GAFFET et al, 2000;ROVELLI et al, 2001;FRANCESCHINA et al, 2001;CULTRERA et al, 2003;CASTRO et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Geotechnical Site Characterisation in the Umbria-Marche Area and Evaluation of Earthquake Site-Response

Luzi

Bindi

Franceschina

et al. 2005

Pure appl. geophys.

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In this research a site classification is proposed for the Umbria-Marche area (central Italy), based on geotechnical and geomorphological criteria. Two empirical techniques to evaluate site effects are used, namely the generalised spectral inversion, and the horizontal to vertical spectral ratio. The soil transfer functions obtained by the two techniques are compared in order to capture the features common to each class and verify the accuracy of the classification.We used strong ground motions recorded during the Umbria-Marche seismic sequence (September 1997-May 1998) and we selected 25 sites that were classified into four groups. The results of the empirical techniques have also been tested using theoretical 1-D or 2-D methods that are commonly used to simulate linear soil behaviour. The results, expressed in terms of amplitude transfer functions, are shown according to each soil class and confirm the consistency of the site characterisation. The empirical techniques are efficient in detecting the fundamental frequency of vibration but seldom the higher harmonics. Conversely, the peak amplitude of the transfer functions is not consistently determined, especially for sites located in deep sedimentary basins, where 2-D effects occur and simplified methods, such as the horizontal to vertical spectral ratios (HVSR) or 1-D theoretical models frequently fail. Significant amplifications are also found for 2-D rock structures such as rock crests or cliffs.

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Seismic microzoning of the area struck by Umbria–Marche (Central Italy) Ms 5.9 earthquake of 26 September 1997

Cited by 38 publications

References 2 publications

On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence

On the ability of Moho reflections to affect the ground motion in northeastern Italy: a case study of the 2012 Emilia seismic sequence

Evidence of Amplification Effects in Fault Zone Related to Rock Mass Jointing

Geotechnical Site Characterisation in the Umbria-Marche Area and Evaluation of Earthquake Site-Response

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