Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018最新文献

{"title":"NUMERICAL INVESTIGATION OF UNKNOWN FOUNDATION GEOMETRY USING FULL WAVEFORM INVERSION OF SURFACE WAVES","authors":"Siavash Mahvelati, J. Coe","doi":"10.4133/SAGEEP.31-020","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-020","url":null,"abstract":"As interest in foundation reuse increases, there has been renewed emphasis on methodologies to characterize existing foundations for determination of unknown geometry, material properties, integrity, and load-carrying capacity. Geophysical and non-destructive testing efforts provide an efficient manner by which to evaluate these parameters. Stiffness information from these methods can be used to evaluate foundation geometry as well as load carrying capabilities based on reverse engineering concepts. The use of surface waves as in the Multichannel Analysis of Surface Waves (MASW) method has been largely neglected for this purpose. MASW offers a number of advantages over other seismic methods due to its robustness, speed, and high signal strength. However, lack of case histories means there is limited information regarding the capabilities of MASW for the purposes of foundation evaluation. Recent efforts have highlighted deficiencies in typical MASW inversion analysis when applied for evaluating unknown foundations. The objective of this study was therefore to examine the effectiveness of MASW when applied using a full waveform inversion (FWI) technique for analysis. Numerical testing was performed on a model representing an in-service foundation system. This paper presents the numerical model followed by a discussion of data analysis and interpretation.","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115313079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"HVSR MEASUREMENTS IN COMPLEX SEDIMENTARY ENVIRONMENT AND HIGHLY STRUCTURED RESONATOR TOPOGRAPHY – COMPARISONS WITH SEISMIC REFLECTION PROFILES AND GEOPHYSICAL BOREHOLE LOGS","authors":"B. Dietiker, A. Pugin, H. Crow, S. Mallozzi, K. Brewer, T. Cartwright, J. Hunter","doi":"10.4133/SAGEEP.31-025","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-025","url":null,"abstract":"Over the last two decades, horizontal-to-vertical spectral ratio (HVSR) measurements from microtremor recordings have gained popularity for seismic microzonation and assessment of earthquake site characteristics such as fundamental frequency (or period). More recently, procedures have been described where empirical relationships are developed between the fundamental frequency and sediment thickness at regional sites where shear wave velocity depth functions are well understood and a simple 2-layer-model is a good approximation of the subsurface structure. In contrast however, in complex glacial stratigraphy, sediment types commonly vary drastically from very soft glaciomarine clay to overconsolidated till. We observe that these changes can lead to strong impedance contrasts and hence, resonating horizons well above bedrock can be resolved. Without a-priori knowledge, sediment thickness could be significantly under-estimated. We examine the frequency spectra of microtremor recordings in both simple and complex sedimentary settings at locations along high-resolution shear wave seismic reflection profiles and at continuously cored boreholes with shear wave velocity (Vs) profiles. Vs range from 80 – 2000 m/s within the unconsolidated sediment overburden. Our results indicate that resonator topography can have a significant impact on peak shape and amplitude. In relatively simple 2-layer cases, peak frequencies decrease and broaden over dipping resonators and even disappear over very steep resonator slopes, indicating that twoand three-dimensional subsurface resonator topography is highly influential on peak shape. Additionally, we present examples where sharp increases in shear wave velocity within the sediment column form strong resonating horizons, producing a high amplitude peak which does not necessarily correlate with the bedrock surface. Our results suggest that resonator topography and velocity structure need to be well understood by a practitioner before interpreting geological conditions","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126052803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CHARACTERIZING THE STIFFNESS OF A SHALLOW BEDROCK SITE USING THE MULTICHANNEL ANALYSIS OF SURFACE WAVES (MASW) METHOD WITH RAYLEIGH AND LOVE WAVES","authors":"Siavash Mahvelati, J. Coe","doi":"10.4133/SAGEEP.31-018","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-018","url":null,"abstract":"The Multichannel Analysis of Surface Waves (MASW) method continues to increase in popularity as a tool to characterize subsurface stiffness for geotechnical engineering purposes, particularly in cases where seismic site characterization is important. MASW is commonly performed using vertical impacts on the ground surface to generate Rayleigh waves (i.e., MASRW). The dispersive behavior of the Rayleigh wave is then imaged by transforming the raw waveforms from the time-space domain into the frequency-phase velocity domain. A characteristic dispersion curve for the site is selected based on examining the pattern of energy accumulation in the dispersion image. An inversion algorithm is then implemented to locate the most probable subsurface stiffness profile that caused the measured dispersion curve. While much research has been devoted to MASRW, horizontally-polarized Love waves have seen limited use in MASW investigations (MASLW), despite evidence to support some advantages in their implementation. In this study, MASW was performed using both Rayleigh and Love waves to characterize conditions at the same shallow bedrock site. To allow for a direct comparison between the results of Rayleigh waves and Love waves, the survey lines for both MASW tests were located in exactly the same position. Generally, the subsurface stiffness profiles resulting from inversion of the MASRW and MASLW dispersion curves agreed reasonably well. However, there were some subtle differences in interpretation of the dispersion images. This paper summarizes field conditions and testing configuration, followed by a discussion of data analysis and interpretation.","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128205026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FARMLAND COMPACTION STUDY USING A HIGH FREQUENCY SURFACE WAVE METHOD","authors":"Zhiqu Lu, G. Wilson, M. Shankle","doi":"10.4133/SAGEEP.31-012","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-012","url":null,"abstract":"For soil exploration in the vadose zone, a high-frequency multi-channel analysis of surface waves (HF-MASW) method has been developed with several enhanced techniques. In this study, we applied this enhanced HF-MASW method to study compaction effects on a farmland. The testing site was located at the Mississippi Agriculture and Forestry Experiment Station facility at Pontotoc, MS. The soils were compacted using a tractor. Two-dimensional HF-MASW surveys were conducted on both non-compacted and compacted sites. The vertical cross-section images in terms of the shear (S)-wave velocity were obtained and compared between the compacted and non-compacted soils. It was found that the compaction causes a significant increasing in the S-wave velocity on the top 20 cm soil. The compaction can affect soil properties down to 60 cm deep. The study demonstrates the capability of the HF-MASW method to noninvasively assess compaction effects.","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128616545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"AN ALTERNATIVE REPRESENTATION OF THE SOIL PROFILE FOR MASW ANALYSIS","authors":"P. Michaels","doi":"10.4133/SAGEEP.31-017","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-017","url":null,"abstract":"A conventional 1-D representation of the soil profile employed in Multi-channel Analysis of Surface Waves (MASW) consists of a fixed grid of layers. Each layer is assumed elastic with material properties of S-wave velocity, P-wave velocity, and mass density. Of these three, the S-wave velocity dominates. Phase velocity dispersion of the Rayleigh wave fundamental mode is often inverted with the S-wave velocity in each fixed layer being the primary object of investigation. This paper presents an alternative representation of the soil profile. In this alternative, control points are the target of investigation. These control points are free to move both in the S-velocity and depth directions. Between the control points, the elastic moduli are interpolated into fine layers which are able to represent gradational variation. In this way, the number of unknowns is kept small compared to the large number of layers. Gradational trends in phase velocity dispersion have been represented well with this approach. The method is illustrated with synthetic data. References to field data papers are also provided. The inversion method employed is Singular Value Decomposition (SVD). Introduction Multi-channel Analysis of Surface Waves (MASW) requires an inversion of a measured dispersion curve into a dynamic soil profile. Rayleigh waves are a mix of Pand SV-wave motion dependent on the soil’s mass density, P-wave velocity, and S-wave velocity. However, the primary object of investigation is the S-wave velocity. A common approach is to functionally relate P-velocity and density to either S-velocity or to fix these less sensitive parameters while inverting for S-wave velocity with depth. For example, Park et al. (1999) required estimates of Poisson’s ratio and density and kept the layer thicknesses unchanged during the inversion. It is common to employ a fixed grid or stack of constant velocity layers to represent the soil profile. One solves for velocity in each layer while setting the other dynamic properties by a chosen relationship to S-velocity or some other strategy. The stack of layers can be thick and of constant thickness (Hutchinson et al., 2008; Coe et al., 2016). The layers can also be variable coarse in thicknesses (Park, 2013; Miller et al., 1999). One challenge in composing the layer grid is for the investigator to capture the soil profile as it exists in nature. An investigation into low and high velocity layers have been performed to address what might be resolved (Shen et al., 2013). Placing a layer at the correct depth is not easy. Once one has laid out a grid, that choice will inevitably regularize the problem in a way that may not capture the boundaries present in nature. Alternatives in Soil Profile Representation It is possible to repose the problem in terms of fixed velocity steps. One would then solve for the layering that best fits the dispersion curve with predefined velocities being fixed. This approach would be difficult to implement sinc","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121175738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"GEOPHYSICAL SURVEYS ON CARROLL COUNTY DAM","authors":"L. Wodajo, C. Hickey, M. Mohammadi, L. Macelloni, Andrew Cummings","doi":"10.4133/SAGEEP.31-006","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-006","url":null,"abstract":"Carroll County Dam (North Mississippi) is an earthen dam approximately 9m high and 229m long, built in 1965 to obstruct an existing little creek and creating a reservoir of approximately 0.12Km. In 2016, during a routine visual inspection, sand boils were observed downstream of the dam. The dam usually retains very little water; however, exceptional flood events could significantly increase pore water pressure and potentially lead to dam failure. For this reason, during the spring of 2017, the National Center for Physical Acoustics in collaboration with the Mississippi Department of Environmental Quality Dam Safety Division has been conducting extensive geophysical measurements to investigate the dam. Several seismic refraction and electric resistivity surveys were conducted at the dam. The as-built plan, historic topographic maps and available borehole information were used to aid the interpretation of the geophysical data. Preliminary results from the study indicate two possible conditions leading to seepage. The location of geophysical anomalies being close to pre impoundment channel support water seeping through an old pre impoundment stream channel. The second possible condition is water seepage through a small lens of silty sand (higher porosity) imbedded within a clay layer that was not properly sealed during preparation of the base of the dam.","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124578201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"LIQUEFACTION POTENTIAL ASSESMENT OF SOME COASTAL SANDS OF LAGOS, SOUTH-WESTERN NIGERIA, USING GEOPHYSICAL AND GEOTECHNICAL METHODS","authors":"H. Oladunjoye, K. Oyedele, L. Adeoti, K. Ishola","doi":"10.4133/SAGEEP.31-007","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-007","url":null,"abstract":"This paper presents the results of the investigation conducted in some parts of wetland areas of Lagos, Nigeria, using Multi-channel analysis of surface waves (MASW), Cone penetration test (CPT) and Standard penetration test (SPT). The primary aim was to delineate probable areas that were prone to induced seismicity. The MASW of the seismic method was used to generate the shear wave velocity (Vs) of the near surface soil while the CPT and SPT were employed to infer the penetration resistance and the blow count in the assessment of the stress-based liquefaction potential of these soils respectively. SeisImager and liquefaction assessment software (known as Cliq) were used to process both the MASW and CPT data respectively. The values of shear wave velocity generated for most sands in the study areas range from 120m/s -200m/s. This value fell within potentially liquefiable sands. From the CPT results, 41.67% of Ikoyi data showed a very high risk to liquefaction while 37% of Badore data indicated severe liquefaction potential. The factors of safety (F.S) against liquefaction potential obtained from the plot of cyclic stress ratio (CSR) against s-wave velocity (Vs) were less than 1. This also corroborated the presence of liquefiable sands within the study areas. Background of the Study Liquefaction phenomenon is one of the geological hazards that resulted from sudden ground shaken (Earthquake). It leads to the loss of strength/stiffness of saturated or partially saturated cohesionless soil which makes it to lose their bearing capacity as they behave like liquid. The solid state of soil is been transformed into liquefied state in response to increased pore pressure and reduced effective stress. Loose, partially/saturated soils are then subjected to shearing, which led to re-arrangement in the soil grains to kind of dense packing devoid of much space as a result of forceful ejection of water in the pore spaces [1]. This action led to decrease in effective stress and shear resistance as the stress from the soil skeleton has been transferred to the precipitating pore water. Coastal Plain Sands is the recent stratigraphic formation of the Dahomey Basin. It is characterized with poorly sorted sands with clay lenses. Nigeria lies on the eastern flank of the Atlantic Ocean, generally believed to be quiet when compare to Pacific Ocean margins which are characterized by subduction tectonics and occurrence of devastating earthquakes. Few Seismic activities have been recorded inform of Earth tremors in Nigeria since 1933 with more than twentyeight (28) cases (Table 1). These occurrences has been attributed to various factors ranging from the presence of fault zones along Ifewara Zungeru, uncontrolled mining capable of inducing earth Tremors and others. Dahomey basin is believed to have seated on equatorial fracture zones such as Romanche, Chain and Charcot fracture zones (Figure 1). These fracture zones are reported to have been responsible for shearing and migr","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131510968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ELECTROMAGNETIC, GPR AND THERMAL MAPPING OF SINKHOLES FOR GROUND REINFORCEMENT","authors":"P. Saksa, K. Rantala","doi":"10.4133/SAGEEP.31-010","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-010","url":null,"abstract":"The city of Helsinki is expanding and building new residence areas in places which may have been filled for long periods of time with heterogeneous ground and infillings. One of these areas, named Jätkäsaari, is an artificially expanded island that is under construction. It has been observed that small sinkholes (extent ~ m) have appeared in unexpected places, and that the subsurface soil matrix transportation process is driven by sea water level fluctuations. There is the need to locate developing sinkholes for ground reinforcement actions. An electromagnetic (EM) short coil spacing instrument, ground penetrating radar (GPR) and airborne thermal imaging were used to test at a selected property area of interest in October 2016. The size of the area mapped in detail with EM and GPR was 4120 m and the size of the area with thermal imaging was larger than 10000 m. The objectives were to locate sinkholes at the site, study how various methods suit to mapping, how consistently the results fit together, and derive recommendations for future use. EM multifrequency and GPR data was first interpreted by classifying the identified objects and by subsequent joint interpretation. Airborne thermal imaging also located multiple spots to be assessed. Most of the potential areas covering GPR and EM objects occupied 16.5 % of the site. Objectives and site setting The city of Helsinki is expanding and building new residence areas. Jätkäsaari is an artificially expanded island that is under construction. It has been observed that small sinkholes (extent ~ m) have appeared in unexpected places (Figure 1), and that the subsurface soil matrix transportation process is likely driven by sea water level fluctuations. Varying grain sizes of fill materials, high porosities and rainfall can accelerate the phenomena. The objectives were to locate cavities and loose ground at the site, study how various methods suit to mapping, how consistently the results fit together, and derive recommendations for future use. Site geotechnical drillings had identified at 0 – 7 meters various types of earth fill; then below that, silt and sand and, finally, a bottom moraine layer. The ground surface was flat; the surface soil was coarse fill or asphalt partly overlaid by 0 – 10 cm silt-sand. Contaminated soils were known to exist in the area. The groundwater was at depth of 2.6 – 3.0 m during the survey. Field arrangements and measurements A suitable available and relatively empty site was selected for measurements where a public school is to be constructed. The original intention was to map an area of about 10000 m. That was considered as practical and representative of what should be surveyed as a minimum per case. SAGEEP 2018 Nashville, Tennessee USA http://www.eegs.org All field measurements were scheduled for one week and actions to completely empty the area and keep it empty were started two to three weeks before that. An area of around 6000 m was emptied and shut off in the beginning","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115653995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EFFECTS OF REDUCTIONS IN NUMBER OF CHANNELS ON RAYLEIGH AND LOVE WAVE DISPERSION IMAGES ACQUIRED USING THE MULTICHANNEL ANALYSIS OF SURFACE WAVES (MASW) METHOD","authors":"Siavash Mahvelati, J. Coe","doi":"10.4133/SAGEEP.31-019","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-019","url":null,"abstract":"The Multichannel Analysis of Surface Wave (MASW) method is widely used in research and practice to characterize subsurface conditions. Typically in this method, Rayleigh or Love wave are first generated using active impacts, and collected by a series of receivers. Then, the waveforms are processed to generate dispersion images that represent velocities of different frequency components in the medium of interest. The depth of MASW investigation is directly proportional to the total spread length of receivers, and one factor that controls the resolution of the dispersion images is the total number of receivers used to acquire the surface waves. It is believed that for a fixed spread length, the larger number of receivers increases the resolution. While this statement has been investigated in the literature for Rayleigh waves, little attention has been placed on the effects number of receivers on Love wave dispersion images. This paper presents results from a MASW survey that proposes to address the effects of channel quantity on Rayleigh and Love wave dispersion images with a particular emphasis on Love waves. MASW records were collected with the same fixed spread length (34.5 m) and were processed considering various receiver quantities (24, 12, 8, and 6). Results indicate that Love waves dispersion images seem to be less sensitive to reductions in number of receivers. As an example, the Love wave dispersion image acquired by considering 8 channels can practically be considered equivalent to that acquired with 24 channels. This paper summarizes site conditions, hardware configurations and testing procedure, followed by a discussion of dispersion images and conclusions.","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129986045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EVALUATION OF THE MICRO-FABRICATED ATOMIC MAGNETOMETER DEPLOYED FROM A SMALL AUTONOMOUS ROTORCRAFT FOR LOCATING LEGACY OIL & GAS WELLS","authors":"G. Veloski, Richard Hammack, J. Sams, Luke D. Wylie, Kenneth M Heirendt","doi":"10.4133/SAGEEP.31-002","DOIUrl":"https://doi.org/10.4133/SAGEEP.31-002","url":null,"abstract":"The Pennsylvania Turnpike Commission Southern Beltway Project, a 13-mile highway segment connecting U.S Route 22 to I-79, is part of a larger beltway system designed to improve east-west mobility in the corridor south and west of Pittsburgh. The proposed highway corridor traverses the McDonald Oilfield and was expected to encounter legacy wells. These wells must be located and properly plugged to meet environmental regulations prior to excavation for highway construction. The National Energy Technology Laboratory (NETL) of the U.S. Department of Energy along with US Aerial Video, Inc. conducted aeromagnetic surveys from a small drone rotorcraft during the summer of 2017 employing the novel Geometrics micro-fabricated atomic magnetometer (MFAM) sensor package to locate these legacy wells within the planned highway right-of-way. Over 200 line-kilometers of magnetic data was collected and processed resulting in many monopolar anomalies that may be interpreted as potential steel-cased wells. A list of magnetic targets was submitted to the PA Turnpike Commission for confirmation on the ground.","PeriodicalId":156801,"journal":{"name":"Symposium on the Application of Geophysics to Engineering and Environmental Problems 2018","volume":"167 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123782581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}