H/V measurements as an effective tool for the reliable detection of landslide slip surfaces: Case studies of Castagnola (La Spezia, Italy) and Roccalbegna (Grosseto, Italy)

Pazzi, Veronica; Tanteri, Luca; Bicocchi, Gabriele; D’Ambrosio, Michele; Caselli, Andrea; Fanti, Riccardo

doi:10.1016/j.pce.2016.10.014

Cited by 62 publications

(52 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These measurements were designed to cover as much of the study area as possible and to obtain some alignments across the study area to generate the vertical cross‐section of the H/V (Pazzi et al ). All the measures were recorded by means of five Tromino® (Del Soldato et al ; Pazzi et al ) so that the noise induced included in the measurements by the instrument are as reduced as possible (SESAME ). The acquisition parameters are summarised in Table .…”

Section: Methodsmentioning

confidence: 99%

“…The last method is based on microtremors characterised by low levels of energy and low amplitudes. It has proven to be one of the most appropriate methods to estimate (i) the resonance frequencies of soft deposits (Del Gaudio, Muscillo and Wasowski ; Larose et al , Lotti et al ; Pazzi et al ), (ii) the interactions between soil and buildings (Herak ; Pazzi et al , ), and (iii) the presence of underground voids, both natural or anthropic (Castellaro and Mulargia ). Cavities do cause a shear velocity inversion that is clearly distinguishable in the H/V curve of values < 1.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessing subsoil void hazards along a road system using H/V measurements, ERTs and IPTs to support local decision makers

Pazzi

Ceccatelli

Gracchi

et al. 2018

Near Surface Geophysics

Self Cite

View full text Add to dashboard Cite

Between 2008 and 2014, nine sinkholes occurred in northeastern Elba Island (Tuscany, Italy), an area with mostly flat terrain (called “Il Piano”) separating the municipalities of Rio nell’Elba and Rio Marina. The last sinkhole damaged the only road (SP26) between the harbour of Rio Marina and the northwestern part of the island. A bypass was immediately built, but the SP26 remains closed. Considering that sinkholes could be densely clustered in sinkhole prone areas, their detection and forecasting are key aspects of local administrative policies. In this paper, we present the results of an integrated geophysical survey aimed at (i) characterizing the geology of the area surrounding the SP26, and (ii) assessing the subsoil void hazard around the road system to support the decision to replace or restore the SP26. Therefore, for the purposes of this research, 120 singlestation seismic noise measurements were taken following the horizontal‐to‐vertical spectral ratio (H/V) or Nakamura technique, while eight 2D electrical resistivity tomography (ERT) and 17 3D‐ERT/induced polarisation measurements were also carried out in the study area. The H/V method allowed the estimation of the mean thickness of the alluvium, whereas the 2D/3D‐ERTs and IPTs permitted the characterisation of the electrical behaviours of the materials and the localisation of the lenticular sand and gravel bodies within a sandy silt layer. The large amount of collected data made the zonation of the subsoil void hazards possible.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing subsoil void hazards along a road system using H/V measurements, ERTs and IPTs to support local decision makers

Pazzi

Ceccatelli

Gracchi

et al. 2018

Near Surface Geophysics

Self Cite

View full text Add to dashboard Cite

show abstract

“…The H/V method, in fact, has proven to be one of the most appropriate to estimate the fundamental/resonance frequency of soft deposits (Lermo and Chavez-Garcia 1994;Larose et al 2015, andPazzi et al 2016d), and also to study the interaction between soil and structures (Herak 2008 andPazzi et al 2016a, b). Fig.…”

Section: Methodsmentioning

confidence: 99%

Monitoring of the vibration induced on the Arno masonry embankment wall by the conservation works after the May 25, 2016 riverbank landslide

Pazzi

Lotti

Chiara

et al. 2017

Geoenviron Disasters

Self Cite

View full text Add to dashboard Cite

Background: The concepts of disaster risk reduction and disaster risk management involve the development, improvement, and application of policies, strategies, and practices to minimize disaster risks throughout society. Nowadays, preserving architectural heritage and ancient monuments from disasters is an important issue in the cultural life of modern societies. The "health" of a building/structure may be evaluate by its deterioration or damage level: monitor the aging and promptly detect relevant damages, play a central role, and structure dynamic characterization and microtremor analysis are considered powerful techniques in this field. A wide bibliography about structures/ buildings seismic dynamic characterization is counterpoised to a missing one about their seismic response during conservation/safety works. This paper focus on the seismic response and monitoring of a historical masonry embankment wall during the conservation works carried out after a riverbank landslide that seriously damaged it. Results: The H/V results of the acquired traces show that main resonance frequency of the masonry embankment wall is between 4 Hz and 15 Hz, in agreement with the frequency range of roughly 10-meters-high, squat and monolithic structure. The whole monitoring period can be divided into three intervals corresponding to three different kind of workings: i) piling work; ii) parapet breakdown, excavation, embankment arrangement and foot wall consolidation; iii) backfill and restoring of the original condition, ordinary construction activities. The maximum peak component particle velocity substantial increase during the second period. All the stations have a higher energy content in the 10-20 Hz frequency range, but the spectra analysis clearly shows that the NS component, perpendicular to the wall, is the most stressed one. Moreover, despite the considerable distance from the August 24 Central Italy earthquake epicentre, the earthquake waveform is clearly recognizable at each station. In fact, the energy is focused around 2 Hz and the signals show directivity neither for the spectrum nor for the H/V. Conclusion: This work may contribute to characterize the vibrations induced by piling work at close range, and help to define the maximum acceptable vibration pattern for such structures, since literature is missing of such case studies. The maximum peak component particle velocity values clearly showed the work advancement. This paper also shows how the H/V technique is a valuable method to estimate the resonant frequency not only of buildings, but also of a squat and monolithic structure like the Lungarno Torrigiani masonry embankment wall.

show abstract

“…Yawar Hussain; Hernan Martinez-Carvajal; Martin Cárdenas-Soto; Rogério Uagoda; Salvatore Martino & Muhammad B. Hussain This technique is based on an idea that frequencydependent ellipticity of surface wave motion can be explained by the shape of HVSR curve (Benjumea et al, 2016) and for determining the resonance of soil deposit over basement was given by Nogoshi & Igarashi (1970, 1971. This technique has been revised after the work of Nakamura, (2008) and now it is considered as a suitable technique for earthquake hazards assessments through microzoation (Di Giulio et al, 2014), to bedrock depth estimation (García-Jerez et al, 2007;Gosar & Lenart, 2010;Ullah et al, 2016) as well as its utilization in archeology is also well established (Kalil et al, 2016) and landslide studies, slip surface and volume estimations are other accepts of its applications (Del Gaudio et al, 2008;Pazzi et al, 2016;Imposa et al, 2017).…”

Section: Hvsrmentioning

confidence: 99%

Resposta em Microtremor de um Movemento de Massa no Distrito Federal, Brasil

et al. 2017

View full text Add to dashboard Cite

The present study provides a brief description of the ambient noise recorded at a slow moving mass movement in Ribeirão Contagem Basin. The area is an interesting natural laboratory as river detachment processes in a number of different stages can be identified and are easily accessible. We investigate the site dynamic characteristics of the study area by recording ambient noise time-series at nine points, using portable nine three-component short period seismometers. The time-series are processed to give both horizontal to vertical spectral ratio (HVSR) curves as well as time-frequency plots of noise power spectral density (SPD). The HVSR curves illustrate and quantify aspects of site resonance effects due to the local geological setting. Probability density function (PDF) shows that noise level lies well between new high noise model (NHNM) and new lower noise model (NLNM) and their probabilities are higher above 2 Hz. HVSR curves present a uniform lithologically controlled peak at 2 Hz. Directional properties of the wavefield are determined by beamforming method. The f-k analysis results in the E-W component show that at 5 Hz phase velocities are close to 1700 m/s while at 10 Hz dropped to 250 m/s. We observed that between 5 and 16 Hz the incoming wavefield arrive from 260 degrees. Further studies will apply a detailed noise analysis for relating the dynamics of the landslide (which can be retriggered by river erosion as well as rainfalls and seismic shaking) to possible changes in detectable physical properties. Keywords: Seismic noise; Power Spectral Density; Probability Density Function; HVSR; f-k analysis ResumoO estudo apresentado fornece uma ampla descrição do ruído ambiental registrado de um deslizamento de encosta lento localizado na bacia do Ribeirão Contagem no Distrito Federal. A área de estudo é um laboratório natural na medida que os processos erosivos do rio podem ser analisados em diferentes estágios de evolução dentro de um setor de fácil acesso. A pesquisa abrange o estudo das características dinâmicas da área por meio do registro das séries temporais do ruído ambiental em nove pontos mediante o uso de sismómetros de período curto e três componentes. As series temporais são processadas para obter as curvas de relação espectral horizontal-vertical (HVSR) e também os gráficos tempo:frequência dos espectros de potência (SPD). As curvas HVSR ilustram e quantificam aspectos dos efeitos de ressonância local devidos ao ambiente geológico. A função de desnsidade de probabilidade (PDF) mostra que os níveis de ruído registrados estão enquadrados entre os limites conhecidos como NHNM (new high noise model) e NLNM (new lower noise model) e que suas probabilidades são maiores acima de 2 Hz. As curvas HVSR apresentam um pico de resposta uniforme litológicamente controlado a 2 Hz. As propriedades direcionais do campo de ondas são determinadas pelo método da viga (beamforming method). A análise dos resultados na componente EW indica que na fase de 5 Hz a velocidade está próxima de 1700 m/s enquanto qu...

show abstract

H/V measurements as an effective tool for the reliable detection of landslide slip surfaces: Case studies of Castagnola (La Spezia, Italy) and Roccalbegna (Grosseto, Italy)

Cited by 62 publications

References 37 publications

Assessing subsoil void hazards along a road system using H/V measurements, ERTs and IPTs to support local decision makers

Assessing subsoil void hazards along a road system using H/V measurements, ERTs and IPTs to support local decision makers

Monitoring of the vibration induced on the Arno masonry embankment wall by the conservation works after the May 25, 2016 riverbank landslide

Resposta em Microtremor de um Movemento de Massa no Distrito Federal, Brasil

Contact Info

Product

Resources

About