Geophysical characterization of a landslide site in the Himalayan foothill region

Israil, M.; Pachauri, A. K.

doi:10.1016/s1367-9120(03)00063-4

Cited by 47 publications

(22 citation statements)

References 17 publications

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“…Many researchers focus on the use of the geophysical application in fossil fuel exploration, existence of minerals and detection of underground water level. Of late, the use of geophysical methods become sustainable and functional in the field of permafrost mapping, block field, sediment thickness, depth and internal structures of landslides (Hauck 2001;Schrott 2002;Israil and Pachauri 2003;SchSrott et al 2003;Bichler et al 2004;Sass 2007).…”

Section: Introductionmentioning

confidence: 99%

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

et al. 2018

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It has now been well established that the depth of bedrock is a key parameter in assessing the impact of local site conditions on seismic hazard analysis. Where conventional geotechnical testing like standard penetration test (SPT) or cone penetration test (CPT) requires a far greater cost and manpower to be used for such purposes, geophysical testing like ground-penetrating radar (GPR) and multichannel analysis of surface waves (MASW) may provide the researchers with more viable options to achieve conclusive evidence on bedrock depth. Application of geophysical techniques has become more and more extensive and advanced in many geo-morphological studies since the early 2000s. Geophysical techniques require less time and effort, and the easy processing of the obtained data is the primary reason for their popularity. However, due to variability in subsoil mechanical properties, wave attenuation and dispersion and diverse geological boundary conditions, the results obtained through geophysical techniques are often ambiguous and non-unique. The interpretation of the obtained data also requires skill and experience, as the range may vary widely and more often than not consensus is difficult to achieve. In this paper, an endeavor has been made to coalesce the results of two widely used geophysical techniques, namely GPR and MASW to derive more conclusive evidence for the detection of bedrock depth in a part of Garhwal Himalayas. The study area comprises of two different cities of Uttarakhand, India. Both the sites possess different geo-morphological attributes and thus prove to be a perfect platform to conduct the experimentations. Both GPR and MASW testing have been performed and results are shown in graphical format. A comparison of the GPR survey with a conventional geotechnical testing (SPT) is also presented here. This study shows that GPR and MASW can provide complementary results in estimating bedrock depth.

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Section: Introductionmentioning

confidence: 99%

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

et al. 2018

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“…[6][7][8]. It is observed that lateral velocity changes can be imaged competently by the use of the seismic tomography method [9] and [10] the utilized seismic tomography. These two methods also become functional in conjunction with the Surface Wave Method (SWM) in the characterization of landslides areas.…”

Section: Introductionmentioning

confidence: 99%

Integrated Seismic Survey for Detecting Landslide Effects on High Speed Rail Line at Istanbul–Turkey

Grit

Kanlı

2016

Open Geosciences

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Abstract:In this study, Multichannel Analysis of Surface Waves Method (MASW), seismic refraction tomography and seismic reflection methods are used together at Silivri district in Istanbul -a district with a landslide problem because of the high speed rail line project crossing through the area. The landslide structure, border and depth of the slip plane are investigated and correlated within the local geology. According to the obtained 2D seismic sections, the landslide occurs through the East-West direction in the study area and the landslide slip plane with its border are clearly obtained under the subsurface. The results prove that the study area is suitable enough for the landslide development and this evolution also affects the high speed rail line project.

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“…In geotechnical engineering, landslides have been established as one of a major natural disaster which creates a problem to the civil engineers and related parties since it causes considerable loss of property, life and the environment. Natural disaster caused by landslides has resulted in large losses involving properties and human life [1], [2], [3] and [4]. According to [1], landslides can occur due to intense rainfall, seismicity, water level change, storm wave or rapid stream erosion and human activity involving deforestation and infrastructure development in unstable slope areas.…”

Section: Introductionmentioning

confidence: 99%

“…However, the effectiveness of geophysical methods largely depend upon the presence of a significant and detectable contrast in the physical properties of different lithological units as the seismic P-wave velocity are normally affected by density, lithology, porosity, lithification, pressure, fluid saturation and anisotropy of the geomaterials. According to [2], lithology, porosity and interstitial fluids of geomaterials can influenced the success of interpretation of subsurface profile based on the seismic P-wave velocity contrast. Furthermore, the reliability performance of any individual geophysical methods will always depends on fundamental physical constraints, e.g.…”

Section: Introductionmentioning

confidence: 99%

Seismic Refraction Investigation on Near Surface Landslides at the Kundasang Area in Sabah, Malaysia

Abidin

Saad²,

Ahmad³

et al. 2012

Procedia Engineering

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Surface geophysical method was used in studying the effect of natural disaster impact and subsurface physical changes located in an active geohazard zone at the Kundasang area in Sabah, Malaysia. The natural disaster impact was a previous surface and subsurface ground damage caused by a landslides activity, and the consequent civil engineering infrastructure failure. 2D seismic refraction tomography (2DSRT) was used in evaluating the continuous subsurface ground damage with particular reference to geomaterials and landslide features based on compressional wave (Primary velocity, vp) results. A total of four spread lines were conducted in two different zones (Northeast and Southwest zone) in Kundasang Secondary School (SMK Kundasang). Primary velocity data was acquired and recorded using ABEM Terraloc MK6 seismograph with the seismic wave being triggered by an impact and detected by arrays of sensitive devices called geophones. 2D seismic refraction primary velocity results representing subsurface profile for each survey line were calculated to determine time and depth of the subsurface profile investigated based on linear and delay time analysis supplied by Optim software package and supported by previous borehole data. The seismic refraction method identified three main layers of geomaterials which contained a subsurface landslides anomaly within the layers. The results consist of top soil/residual soil (330 600 m/s) 0 6 m, weathered zone with a mixture of soil, boulder and rock fractured (500 1900 m/s) 2 25 m and fresh rock/bedrock (> 2300 m/s) from 8 m depth. The landslides geometry was determined inconsistently within the survey line from 3 25 m (thickness), 57 and 75 m (width) and 100 m and more (length) with a primary velocity of 700 1800 m/s. The seismic refraction profiles obtained also revealed that the landslide occurrence extends from the southeast zone and continuously heading towards the northeast zone. A good matching seismic refraction results was obtained and calibrated using borehole results which shows that this technique was appropriate to be applied in near-surface landslide assessment which can further substantiates and compliments borehole data and others physical mapping * Corresponding author. Tel.: +6-013-3738-707; fax: +6-07-453-6588 . E-mail address: hazreek@uthm.edu.my .Available online at www.sciencedirect.com 517 Mohd Hazreek Zainal Abidin et al. / Procedia Engineering 50 ( 2012 ) 516 -531 data rapidly in a lower cost. Furthermore, this geophysical method adopts a surface technique that can minimise the disruption and damage to the site thus preserving a sustainable environment during the site investigation data acquisition stages.

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Geophysical characterization of a landslide site in the Himalayan foothill region

Cited by 47 publications

References 17 publications

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

Estimation of bedrock depth for a part of Garhwal Himalayas using two different geophysical techniques

Integrated Seismic Survey for Detecting Landslide Effects on High Speed Rail Line at Istanbul–Turkey

Seismic Refraction Investigation on Near Surface Landslides at the Kundasang Area in Sabah, Malaysia

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