Speedy Techniques to Evaluate Seismic Site Effects in Particular Geomorphologic Conditions: Faults, Cavities, Landslides and Topographic Irregularities

Panzera, Francesco; Lombardo, Giuseppe; D’Amico, Sebastiano; Galea, Pauline

doi:10.5772/55439

Cited by 25 publications

(31 citation statements)

References 67 publications

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“…According to the spatial master plan of the city of Ivanec dated from 2012 [3] and amendments from 2016, the maximum allowed construction height of the buildings is 12-15 m (four or five floors) in the urban residential area in the central part of the city (Figure 1b In recent earthquakes (e.g., Mexico City 1985), it was observed that recorded ground motions on soft soil sites (e.g., alluvial basins, soft sediments) were significantly larger than those recorded on In recent earthquakes (e.g., Mexico City 1985), it was observed that recorded ground motions on soft soil sites (e.g., alluvial basins, soft sediments) were significantly larger than those recorded on nearby rock outcrops [4][5][6][7]. One of the challenges in earthquake engineering practice is to evaluate the local ground response in order to predict site amplification of surface ground motions based on specific geological site characteristics, geometrical features of soil deposits and surface topography [6,8,9]. In practice, the effects of local soil conditions were evaluated using the amplification factor: the ratio of ground motion at the free surface and ground motion at a nearby rock site [5,6,9,10].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Seismic Site Amplification in the City of Ivanec (NW Part of Croatia) Using the Microtremor HVSR Method and Equivalent-Linear Site Response Analysis

et al. 2019

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The city of Ivanec is located between valley of the Bednja River and Mt. Ivanščica and this area can be prone to significant seismic site amplification due to local site characteristics. This study presents the first assessment of seismic site amplification for the city of Ivanec by the microtremor horizontal-to-vertical-spectral-ratio (HVSR) method and the equivalent-linear (EQL) site response analysis. Based on microtremor measurements and HVSR analysis, fundamental soil frequency and HVSR peak amplitude maps indicate potentially seismic danger zones. The 1-D EQL site response analysis was performed using multiple suites of earthquake ground motions scaled to the 95-and 475-year return periods of peak ground accelerations. Site amplification maps at the predominant peak frequency and ground surface indicate two microzones, one with high amplification in the central part of the city due to soft soil characteristics, and the other with small amplification in the transitional zone from alluvial basin towards the foothills of Mt. Ivanščica. HVSR peak amplitudes and site response peak amplifications showed similar spatial distributions with similar predominant peak frequencies but with different amplitude levels. Site amplification maps provided significant information about potential resonance effects for structures of certain heights that can be correlated with the local ground shaking characteristics.

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Section: Introductionmentioning

confidence: 99%

Assessment of the Seismic Site Amplification in the City of Ivanec (NW Part of Croatia) Using the Microtremor HVSR Method and Equivalent-Linear Site Response Analysis

et al. 2019

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“…However, the presence of clear peaks in the HVSR measurements performed adjacent to villages at higher elevations may be due, at least in part, to topographic amplification [44], also with complex effects related to vertical and lateral heterogeneities [45]. As already mentioned, the detailed assessment of such complex situations will require more thorough investigations through 2D and 3D analysis, to be carried out during subsequent levels of seismic microzonation, since the required parameters of the subsoil are presently not available.…”

Section: Model Of the Subsoilmentioning

confidence: 99%

Preliminary seismic microzonation in a mountainmunicipality of Tuscany (Italy)

Matassoni¹,

Fiaschi²,

Silengo

et al. 2015

Open Geosciences

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Abstract:In this paper we describe a microzonation survey carried out at a mountain Municipality (Piteglio, Northern Apennines). We complemented the available data by conducting 106 microtremor measurements for Horizontal-toVertical Spectral Ratio (HVSR) analysis. Most of the data concern the three major rural villages (Piteglio-Prataccio, Popiglio and Prunetta). Furthermore, we installed a field mobile seismic station at two of the major villages, in order to obtain earthquakes recordings. The HVSR analysis shows amplification effects due to eluvial or colluvial deposits overlying the seismic bedrock, even for areas previously mapped as bedrock outcrops. Most zones characterized by sandstone outcrops show peaked HVSR traces. This observation could be also interpreted in terms of a topographic effect. In contrast, areas characterised by chaotic materials (olistostrome) generally exhibit a flat HVSR. Other areas of seismic amplification were identified on alluvial and landslide deposits. Results by HVSR analysis are well correlated with available data from geo-technical and geophysical surveys, thus allowing to invert HVSRs for the physical properties of the subsoil. Subsoil properties can thus be extrapolated also in areas for which only measurements of seismic noise are available. Moreover, noise HVSRs agree well with those from earthquakes recorded at the different selected sites.

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“…Factors affecting the seismic response of a site include topographical features, the geometry of sedimentary features, and the status of subsurface structures such as landslide deposits, structural discontinuities, cavities, and the presence of water (Panzera et al, 2013). The response of specifi c underground structures has been the focus of many previous studies.…”

Section: Introductionmentioning

confidence: 99%

Detecting changes in long-period site responses after the M w 7.6 Chi-Chi earthquake, Taiwan, using strong motion records

Yu¹,

Wu²,

Cheng³

2015

Earthq. Eng. Eng. Vib.

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Temporal changes in site effects are obtained using the HVSR (horizontal-to-vertical spectral ratio) method and strong motion records after the M w 7.6 Chi-Chi earthquake, Taiwan. Seismic data recorded between 1995 and 2010 are used, comprising 3,708 data from 15 stations adjacent to the Chelungpu fault. Temporal fl uctuations are determined by analyzing the site effect variation using a time-frequency variation (TFV) diagram based on these seismic data. Stations adjacent to the fault show signifi cant disturbances in the resonance frequency at 16-26 Hz. Station TCU129 shows a 40% drop in fundamental frequency after the main shock, and a gradual return to the original state over nine years. For stations located farther from the fault zone, sudden changes in tectonic stress play a dominant role in temporal changes to the HVSR. An impact analysis of the directional factor confi rms our fi nding that the proximity of the fault to seismic stations has the most infl uence on data.

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Speedy Techniques to Evaluate Seismic Site Effects in Particular Geomorphologic Conditions: Faults, Cavities, Landslides and Topographic Irregularities

Cited by 25 publications

References 67 publications

Assessment of the Seismic Site Amplification in the City of Ivanec (NW Part of Croatia) Using the Microtremor HVSR Method and Equivalent-Linear Site Response Analysis

Assessment of the Seismic Site Amplification in the City of Ivanec (NW Part of Croatia) Using the Microtremor HVSR Method and Equivalent-Linear Site Response Analysis

Preliminary seismic microzonation in a mountainmunicipality of Tuscany (Italy)

Detecting changes in long-period site responses after the M w 7.6 Chi-Chi earthquake, Taiwan, using strong motion records

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