Electrical resistivity tomography for studying liquefaction induced by the May 2012 Emilia-Romagna earthquake (Mw = 6.1, northern Italy)

Giocoli, A.; Quadrio, Bruno; Bellanova, Jessica; Lapenna, V.; Piscitelli, S.

doi:10.5194/nhess-14-731-2014

Cited by 11 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1a, 2a, 3a) and 'n' numbers of depth levels (overlapping data levels). To obtain two-dimensional resistivity images of the subsurface, apparent resistivity data were inverted using RES2DINV software (Loke and Barker 1996;Revil et al 2008;Galli et al 2014;Giocoli et al 2014). Electrical images show a root mean-squared (RMS) error of 6% for ERT1 and 6.3% for ERT2, after three iterations.…”

Section: Electrical Resistivity Tomographymentioning

confidence: 99%

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

Moscatelli

Vignaroli

Pagliaroli

et al. 2020

Bull Eng Geol Environ

Self Cite

View full text Add to dashboard Cite

Nowadays, 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.

show abstract

Section: Electrical Resistivity Tomographymentioning

confidence: 99%

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

Moscatelli

Vignaroli

Pagliaroli

et al. 2020

Bull Eng Geol Environ

Self Cite

View full text Add to dashboard Cite

show abstract

“…Terdapat tiga metode investigasi geoteknik dan geofisika in-situ yang digunakan untuk menganalisis potensi likuifaksi, yaitu metode uji penetrasi konus (CPT), uji penetrasi standard (SPT), kecepatan gelombang geser (Vs) (Idriss and Boulanger, 2008). Selain itu, metode geolistrik juga digunakan untuk mempelajari lapisan pasir yang terlikuifaksi (Giocoli et al, 2014). Febriana et al (2020) (Shearer, 2009).…”

Section: Pendahuluanunclassified

Evaluasi Potensi Likuifaksi Di Wilayah Cekungan Bandung Berdasarkan Metode Analisis Multi-Sensor Gelombang Permukaan

2020

View full text Add to dashboard Cite

ABSTRAK Secara geologi, wilayah Cekungan Bandung tersusun oleh endapan danau Bandung purba yang terdiri atas lapisan lempung dengan sisipan lapisan pasir sehingga rentan terhadap likuifaksi akibat gempa bumi. Metode analisis multi-sensor gelombang permukaan (MASW) adalah salah satu metode geofisika yang menghasilkan model satu dimensi kecepatan gelombang geser (Vs) terhadap kedalaman. Makalah ini menyajikan hasil analisis potensi likuifaksi menggunakan data profil Vs di 5 lokasi yang tersebar di wilayah Cekungan Bandung. Data Vs diperoleh dengan menggunakan 24 geophone yang tersebar dengan spasi 4 meter di setiap lokasi penelitian. Hasil analisis data menggunakan metode MASW menghasilkan profil Vs dan Vs30 di setiap lokasi yang menunjukkan bahwa lapisan tanah di wilayah Cekungan Bandung dapat diklasifikasi dalam kelas situs E dan D. Sedangkan berdasarkan hasil analisis potensi likuifaksi menggunakan profil Vs, dengan mempertimbangkan percepatan tanah puncak yang dihasilkan oleh Sesar Lembang (M w 6,5), mengindikasikan bahwa lapisan pasir di dalam endapan danau purba mempunyai potensi likuifaksi pada kedalaman dan ketebalan yang bervariasi. Lapisan pasir dengan nilai Vs < 175 m/detik yang menyebabkan potensi likuifaksi di daerah Bojongemas lebih tinggi dibandingkan dengan daerah lainnya. Hasil penelitian ini menunjukkan kesesuaian dengan hasil analisis likuifaksi berdasarkan metode uji penetrasi standar dari hasil penelitian terdahulu.Kata kunci: gelombang permukaan, kelas situs, kecepatan gelombang geser, likuifaksi, MASW ABSTRACT − The Evaluation of Liquefaction Potential in Bandung Basin Area Based on Multi-Channel Analysis of Surface Wave. The Bandung Basin region is composed of ancient Bandung lake sediment deposits consisting of thick clay layers intercalated with sand layers, which is vulnerable to liquefaction due to earthquakes. The Multi-channel Analysis ofSurface Wave (MASW) analysis method is a geophysical method that produces a onedimensional model of shear wave velocity (Vs) against depth. This paper presents the results of an analysis of the potential for liquefaction using Vs profile data at 5 locations spread across the Bandung Basin. using 24 geophones with 4-m spacing. The results of data analysis using the MASW method produce Vs and Vs30 profiles at each location which indicate that the soil layers in the Bandung Basin area can be classified into E and D site classes. Meanwhile, based on the results of the analysis of potential liquefaction using the Vs profile, taking into account the peak soil acceleration produced by the Lembang Fault (Mw 6.5), indicates that the sand layer in ancient lake sediment deposits has the potential for liquefaction at varying depths and thicknesses. Sand layer with a value of Vs <175 m / sec which causes the potential for liquefaction in the Bojongemas area is higher than in the other areas. The results of this study confirm liquefaction analysis based on the standard penetration test method from the previous study.

show abstract

“…Thanks to the diverse range of now mature exploration methodologies, applied geophysics holds a great potential for the collection of spatially distributed data that can be both combined with each other and with data derived from direct surveys. Geophysical methods have been applied in environmental and engineering studies with the aim to locate and characterize near-surface geological structures (Caputo et al 2003;Giocoli et al 2007;Galli et al 2017), aquifers (Vereecken et al 2006), landfills (Konstantaki et al 2015), landslides (Jongmans and Garambois 2007;Perrone et al 2014), liquefaction phenomena (Giocoli et al 2014), to investigate site for building foundations (Soupios et al 2007), to locate underground excavations (Kova cevi c et al 2013), to evaluate earthquake hazard and to support seismic microzonation studies (Boncio et al 2011;Gallipoli et al 2011;Mucciarelli et al 2011;Vignola et al 2018).…”

Section: Introductionmentioning

confidence: 99%

An integrated geophysical approach for urban underground characterization: the Avigliano town (southern Italy) case study

Calamita

Serlenga

Stabile

et al. 2018

Geomatics, Natural Hazards and Risk

Self Cite

View full text Add to dashboard Cite

A geophysical approach, based on the integration of satellite differential interferometric SAR technique and in situ geoelectrical and seismic methods, was applied with the aim to characterize a portion of urban area of Avigliano (PZ) town in Basilicata Region (southern Italy) affected by ground instability phenomena. Satellite analysis helped to discriminate areas of the town affected by superficial deformations and to monitor the dynamic behaviour of the structures located in these areas. Results from geoelectrical and seismic (active and passive) methods were compared with direct data (stratigraphic) and were interpreted with the aim to reconstruct the geometry of the subsoil. The joint application of both in situ techniques allowed the overcoming of the specific limits of each method and to improve the poor quality of the data due to the noise conditions typical of measurements carried out in urban areas. A preliminary geophysical model of the subsoil was obtained. The geophysical contrasts highlighted the presence of lithological discontinuities due to the superficial deformation processes that are affecting the portion of the investigated urban area. All the information has been transferred to the public administration technicians involved in the mitigation of hydrogeological risk in Basilicata Region.

show abstract

Electrical resistivity tomography for studying liquefaction induced by the May 2012 Emilia-Romagna earthquake (Mw = 6.1, northern Italy)

Cited by 11 publications

References 14 publications

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

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

Evaluasi Potensi Likuifaksi Di Wilayah Cekungan Bandung Berdasarkan Metode Analisis Multi-Sensor Gelombang Permukaan

An integrated geophysical approach for urban underground characterization: the Avigliano town (southern Italy) case study

Contact Info

Product

Resources

About