A Comparison of Four Geophysical Methods for Determining the Shear Wave Velocity of Soils

Anderson, Neil Lennart; Thitimakorn, Thanop; Ismail, Ahmed; Hoffman, David J.

doi:10.2113/gseegeosci.13.1.11

Cited by 20 publications

(13 citation statements)

References 5 publications

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“…Shahzada et al (2012) correlated SPT-N values with Vs obtained from MASW. Whereas in this study, SPT-N values were correlated with Vs obtained seismic crosshole test (CH), which is a more reliable test than MASW (Anderson et al 2007). New empirical correlations for SPT-Vs and CPT-Vs have been proposed herein and compared to the selected existing correlations.…”

Section: Technical Notesmentioning

confidence: 99%

Evaluation of Shear Wave Velocity Correlations and Development of New Correlation Using Cross-hole Data

Ahmad

Waseem²,

Abbas

et al. 2015

IJGE

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Seismic microzonation studies are being proposed in Pakistan. In addition, a downhole array of accelerometers was planned to be installed in the University of Engineering and Technology, Mardan Campus. Therefore, extensive geotechnical and geophysical tests were conducted. Shear wave velocity (Vs) is a fundamental parameter required for these microzontation studies. It is feasible in terms of cost and space to determine Vs from Standard Penetration Test (SPT) or Cone Penetration Test (CPT) results through empirical correlations. The purpose of this paper is to explore the applicability and predictability of these correlations to the data collected from the area where downhole array is planned. Data from these surveys was used to evaluate relevant correlations selected from literature. Predicted shear wave velocity values from these correlations were compared with measured shear wave velocity values from seismic crosshole tests. Most SPT-Vs correlations evaluated showed low predictability. The SPT-Vs correlation that showed highest degree of fitness to the dataset was the one developed for Lucknow, India, a city with similar geological setting, workmanship and SPT method employed. Site specific SPTVs correlation was also proposed. Most of the CPT-Vs correlations evaluated showed considerable predictive capability compared to the SPT-Vs correlations.

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Section: Technical Notesmentioning

confidence: 99%

Evaluation of Shear Wave Velocity Correlations and Development of New Correlation Using Cross-hole Data

Ahmad

Waseem²,

Abbas

et al. 2015

IJGE

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“…Comparisons with borehole log data and other techniques developed for the same purpose show that the ReMi™ technique yields reliable results. The technique has been used in several studies to obtain the V s structure of the soil (Louie 2001;Scott et al 2004;Thelen et al 2005;Richwalski et al 2007;Anderson et al 2007;Chávez-García et al 2007;Pancha et al 2008;Sirles and Batchko 2010;Pancha et al 2017). In addition, the technique has been used to depict the bedrock topography.…”

Section: Introductionmentioning

confidence: 99%

Refraction microtremor (ReMi™)–based investigation of the accumulation of Quaternary sediments on the northern edge of Isparta, Turkey

Kanbur

Tokbaş

2020

Arab J Geosci

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Refraction microtremor (ReMi™) technique is one of the most effective techniques to obtain near-subsurface average shear wave velocity structure. This technique was used to delineate the subsurface structure of the Plio-Quaternary sediments deposited on the limestone bedrock. Transect data were collected at 130 points along the N-S profile at the northern part of the Isparta basin with a 20-m interval. The seismic velocity-depth models were produced from these data separately, and then, 2D seismic section was obtained from these models. The subsurface layers and possible fault structures were interpreted according to this cross section. The field observation and the shear wave velocity section showed that this area was controlled by normal fault systems causing a NNW and SSE extensional structure. The formed depression structure had been filled in time by the Plio-Quaternary sediments. This case was interpreted as an evidence of fluvial reworking possibly during flash-flood events. As a result, this study shows that the ReMi™ technique may also be used for delineating near-surface bedrock topography and fault structures.

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“…Studies have been performed to compare the results of ReMi with other techniques (Stephenson et al, 2005;Jaume, 2006;Anderson et al, 2007;Chavez-Garcia et al, 2007;Richwalski et al, 2007;Castellaro and Mulargia, 2009;Rosenblad andLi, 2009a, 2009b), reaching the general conclusion that ReMi can yield accurate results if the key assumption of isotropic source distribution is satisfied and if care is taken in picking the dispersion curve. If the key assumptions are wrong, the method fails.…”

Section: Introductionmentioning

confidence: 99%

Refraction microtremors: Data analysis and diagnostics of key hypotheses

Strobbia¹,

Cassiani

2011

GEOPHYSICS

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Surface-wave methods are quite popular for site characterization in geotechnical earthquake engineering. Among these techniques, a particular role is taken by passive methods for their ability to yield information on the low-frequency range and consequently on large depths. One such passive method, the refraction microtremors (ReMi) technique, has been proposed as a simple alternative to 2D-array techniques to estimate surface-wave dispersion by using linear arrays of geophones. The technique owes its name to the use of widely available instruments also adopted for seismic refraction. The basic hypotheses underlying ReMi are that noise is distributed isotropically in azimuth or is aligned exactly with the array. These conditions often are not met, and in most cases they are not verified because such analysis requires an accurate approach to data processing that is rarely applied. We have developed an algorithm that verifies ReMi's basic hypotheses by analyzing experimental data. In addition, we have proposed an algorithm to identify the lowest apparent velocity on the ReMi spectra, thus avoiding interpretation problems

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A Comparison of Four Geophysical Methods for Determining the Shear Wave Velocity of Soils

Cited by 20 publications

References 5 publications

Evaluation of Shear Wave Velocity Correlations and Development of New Correlation Using Cross-hole Data

Evaluation of Shear Wave Velocity Correlations and Development of New Correlation Using Cross-hole Data

Refraction microtremor (ReMi™)–based investigation of the accumulation of Quaternary sediments on the northern edge of Isparta, Turkey

Refraction microtremors: Data analysis and diagnostics of key hypotheses

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