Multi-frequencies GPR measurements for delineating the shallow subsurface features of the Yushu strike slip fault

Zhang, Di; Li, Jiacun; Liu, Shaotang; Guo, Wenwen

doi:10.1007/s11600-019-00271-9

Cited by 13 publications

(6 citation statements)

References 41 publications

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“…These studies have shown geophysical images of faulting, supporting and/or extending observations on outcrops, boreholes, and trench data and contributed to base knowledge of seismogenic structures as well as to the seismic hazard assessment of several regions around the world. Among the pioneers, we can mention Benson (1995), Smith and Jol (1995), Busby and Merritt (1999), Cai et al (1996), andLiner andLiner (1997), and in the successive 20 years, other 2D GPR studies were achieved across several faults worldwide (Audru et al, 2001;Demanet et al, 2001;Overgaard and Jakobsen, 2001;Bano et al, 2002;Liberty et al, 2003;Reiss et al, 2003;Slater and Niemi, 2003;Malik et al, 2007;Wallace et al, 2010;Yalciner et al, 2013;Imposa et al, 2015;Anchuela et al, 2016;Nobes et al, 2016;Matos et al, 2017;Pousse-Beltran et al, 2018;Zajc et al, 2018;Zhang et al, 2019 andShaikh et al, 2020). In Italy, only a few GPR studies are currently available across normal faults (e.g., Salvi et al, 2003;Jewell and Bristow, 2006;Pauselli et al, 2010;Roberts et al, 2010;Ercoli et al, 2013aErcoli et al, , 2014Bubeck et al, 2015;Cinti et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

Ground-penetrating radar signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy

et al. 2021

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Abstract. With the aim of unveiling evidence of Late Quaternary faulting, a series of ground-penetrating radar (GPR) profiles were acquired across the southern portion of the Fosso della Valle–Campotenese normal fault (VCT), located at the Campotenese continental basin (Mt. Pollino region) in the southern Apennines active extensional belt (Italy). A set of 49 GPR profiles, traced nearly perpendicular to this normal fault, was acquired using 300 and 500 MHz antennas and carefully processed through a customized workflow. The data interpretation allowed us to reconstruct a pseudo-3D model depicting the boundary between the Mesozoic bedrock and the sedimentary fill of the basin, which were in close proximity to the fault. Once the GPR signature of faulting was reviewed and defined, we interpret near-surface alluvial and colluvial sediments dislocated by a set of conjugate (W- and E-dipping) discontinuities that penetrate inside the underlying Triassic dolostones. Close to the contact between the continental deposits and the bedrock, some buried scarps which offset wedge-shaped deposits are interpreted as coseismic ruptures, subsequently sealed by later deposits. Our pseudo-3D GPR dataset represented a good trade-off between a dense 3D-GPR volume and conventional 2D data, which normally requires a higher degree of subjectivity during the interpretation. We have thus reconstructed a reliable subsurface fault pattern, discriminating master faults and a series of secondary splays. This contribution better characterizes active Quaternary faults in an area which falls within the Pollino seismic gap and is considered prone to severe surface faulting. Our results encourage further research at the study site, whilst we also recommend our workflow for similar regions characterized by high seismic hazard and scarcity of near-surface geophysical data.

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Section: Methodsmentioning

confidence: 99%

Ground-penetrating radar signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy

et al. 2021

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“…These studies have shown geophysical images of faulting, supporting and/or extending outcrop, borehole, trench data, and contributing to base-knowledge of seismogenic structures as well as to the seismic hazard assessment of several regions around the world. Among the pioneers, we can mention Benson (1995), Smith and Jol (1995), Busby and Merritt (1999), Cai et al (1996) and Liner and Liner (1997), and on the successive twenty years, other 2D GPR studies were achieved across several faults (Audru et al 2001;Demanet et al 2001;Overgaard and Jakobsen, 2001;Bano et al 2002;Liberty et al 2003;Reiss et al 2003;Slater and Niemi, 2003;Malik et al 2007;Wallace et al 2010;Yalciner et al 2013;Imposa et al 2015;Anchuela et al 2016;Nobes et al 2016;Matos et al 2017;Pousse-Beltran et al 2018;Zajc et al 2018;Zhang et al 2019 andShaikh et al 2020). A few GPR surveys have been acquired across Italian normal faults (Salvi et al 2003;Jewell and Bristow, 2006;Pauselli et al 2010;Roberts et al 2010;Ercoli et al 2013a;Bubeck et al 2015;Cinti et al 2015).…”

Section: Methodsmentioning

confidence: 99%

GPR signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy

Ercoli

Cirillo

Pauselli

et al. 2021

Preprint

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Abstract. With the aim of unveiling evidence of Late Quaternary faulting, a series of Ground Penetrating Radar (GPR) profiles were acquired across the Campotenese continental basin (Mt. Pollino region) in the southern Apennines active extensional belt (Italy). A set of forty-nine 300 MHz and 500 MHz GPR profiles, traced nearly perpendicular to a buried normal fault, were acquired and carefully processed through a customized workflow. The data interpretation allowed us to reconstruct a pseudo-3D model depicting the boundary between the Mesozoic bedrock and the sedimentary fill of the basin, which were in close proximity to the fault. Once reviewing and defining the GPR signature of faulting, we highlight in our data how near surface alluvial and colluvial sediments appear to be dislocated by a set of conjugate (west and east-dipping) discontinuities that penetrate inside the underlying Triassic dolostones. Close to the contact between the continental deposits and the bedrock, some buried scarps which offset wedge-shaped deposits are interpreted as coseismic ruptures, subsequently sealed by later deposits. Although the use of pseudo-3D GPR data implies more complexity linking the geophysical features among the radar images, we have reconstructed a reliable subsurface fault pattern, discriminating master faults and a series of secondary splays. We believe our contribution provides an improvement in the characterization of active faults in the study area which falls within the Pollino seismic gap and is considered potentially prone to severe surface faulting. Our aim is for our approach and workflow to be of inspiration for further studies in the region as well as for similar high seismic hazard areas characterized by scarcity of near-surface data.

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“…The GPR technique is a geophysical, non-invasive and non-destructive method that has become widely established in recent years due to its ability to return high-resolution images of the area under investigation [33,38]. GPR is widely used in the fields of geology for the identification of cavities, piezometric surface, stratigraphic succession and location of buried services [18,24,37,38,[52][53][54][55][56], and archaeology [57] and engineering [58][59][60].…”

Section: Gpr Measurementsmentioning

confidence: 99%

“…GPR has also been applied with good results in landslide studies to obtain a detail of the landslide structure, to identify the depth of the sliding surface, and lithological contacts. The radargram can in fact provide a scan of the internal structure of the landslide and the distribution of water within it [24,[36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Geophysical Surveys for Geotechnical Model Reconstruction and Slope Stability Modelling

et al. 2023

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Performing a reliable stability analysis of a landslide slope requires a good understanding of the internal geometries and an accurate characterisation of the geotechnical parameters of the identified strata. Geotechnical models are commonly based on geomorphological data combined with direct and intrusive geotechnical investigations. However, the existence of numerous empirical correlations between seismic parameters (e.g., S-wave velocity) and geotechnical parameters in the literature has made it possible to investigate areas that are difficult to reach with direct instrumentation. These correlations are often overlooked even though they enable a reduction in investigation costs and time. By means of geophysical tests, it is in fact possible to estimate the N-SPT value and derive the friction angle from results obtained from environmental seismic noise measurements. Despite the empirical character and a certain level of uncertainty derived from the estimation of geotechnical parameters, these are particularly useful in the preliminary stages of an emergency, when straight data are not available and on all those soils where other direct in situ tests are not reliable. These correlations were successfully applied to the Theilly landslide (Western Alps, Italy), where the geotechnical model was obtained by integrating the results of a multi-parameter geophysical survey (H/V seismic noise and ground-penetrating radar) with stratigraphic and geomorphological observations, digital terrain model and field survey data. The analysis of the triggering conditions of the landslide was conducted by means of hydrological–geotechnical modelling, evaluating the behaviour of the slope under different rainfall scenarios and considering (or not) the stabilisation interventions present on the slope. The results of the filtration analyses for all events showed a top-down saturation mechanism, which led to the formation of a saturated face with a maximum thickness of 5 m. Stability analyses conducted for the same events showed the development of a shallow landslide in the first few metres of saturated soil. The modelling results are compatible with the actual evolution of the phenomenon and allow us to understand the triggering mechanism, providing models to support future interventions.

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Multi-frequencies GPR measurements for delineating the shallow subsurface features of the Yushu strike slip fault

Cited by 13 publications

References 41 publications

Ground-penetrating radar signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy

Ground-penetrating radar signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy

GPR signature of Quaternary faulting: a study from the Mt. Pollino region, southern Apennines, Italy

Geophysical Surveys for Geotechnical Model Reconstruction and Slope Stability Modelling

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