Abstracts, Review of Progress in Quantitative Nondestructive Evaluation (Kingston, RI, July 26•Fi31, 2009)

Total Page:16

File Type:pdf, Size:1020Kb

Abstracts, Review of Progress in Quantitative Nondestructive Evaluation (Kingston, RI, July 26•Fi31, 2009) Abstracts Review of Progress in Quantitative NDE University of Rhode Island - Kingston (URI) Kingston, Rhode Island July 26 – 31, 2009 Organized by: Center for Nondestructive Evaluation Iowa State University In cooperation with: Air Force Research Laboratories American Society for Nondestructive Testing Ames Laboratory U.S. Department of Energy Army Research Laboratory Federal Aviation Administration National Aeronautics and Space Administration LaRC National Science Foundation Industry/University Cooperative Research Centers The Center for Nondestructive Evaluation is a member of the ISU Institute for Physical Research and Technology. MONDAY Plenary Session 1 – Evolution of QNDE .......................... 1 Plenary Session 2 – QNDE Applied to Ever Changing Societal Needs .............................................................. 1 Session 3 – UT Modeling ................................................. 5 Session 4 – Signal Processing ....................................... 11 Session 5 – Structural Health Monitoring and NDE Reliability ............................................................ 17 Session 6 – NDE for Material Properties ........................ 23 MONDAY AFTERNOON, JULY 27, 2009 This grid is provided for planning purposes. As you go through your abstract book to decide which talks/sessions you would like to attend, you can mark them on this grid for a one shot look at where you would like to go and when on each day of the conference. Session 5 Session 4 Structural Health Session 6 Session 3 Signal Monitoring and NDE for Material UT Modeling Processing NDE Reliability Properties CBLS 010 Chafee 273 CBLS 100 Chafee 277 1:30 PM 1:50 2:10 2:30 2:50 3:10 COFFEE BREAK 3:30 3:50 4:10 4:30 4:50 5:10 5:30 ADJOURN Plenary Sessions 1 and 2 REVIEW OF PROGRESS IN QUANTITATIVE NDE University of Rhode Island (URI) Kingston, Rhode Island July 26 – 31, 2009 PROGRAM Monday, July 27, 2009 PLENARY SESSION 1 EVOLUTION OF QNDE R. B. Thompson, Chairperson CBLS 100 9:00 AM Opening Remarks 9:15 AM Evolution of QNDE's Core Interdisciplinary Science and Engineering Base ---D. O. Thompson, Iowa State University, Center for NDE, 1915 Scholl Road, Ames, IA 50011 10:10 AM Break PLENARY SESSION 2 QNDE APPLIED TO EVER CHANGING SOCIETAL NEEDS D. E. Chimenti, Chairperson CBLS 100 10:30 AM NDE: Surfing the Electromagnetic Spectrum ---H. I. Ringermacher, GE Research Center, KW D254, 1 Research Circle, Schenectady, NY 12309 11:20 AM NDT in Civil Engineering: Experience and Results of the FOR 384 Research Group ---H. Wiggenhauser, BAM, Federal Institute for Materials Research and Testing, Division VIII.2, Non-destructive Damage Assessment and Environmental Measurement Methods, Unter den Eichen 87, D-12205, Berlin, Germany; I. H. W. Reinhardt, Universität Stuttgart, Institut für Werkstoffe im Bauwesen und Otto-Graf-Institut, Pfaffenwaldring 4, 70440 Stuttgart 12:10 PM Lunch Please Note: The bolded authors throughout this program indicate the presenting author. - 1 - MONDAY, PLENARY SESSION 1 Evolution of QNDE's Core Interdisciplinary Science and Engineering Base ---Donald O. Thompson, Iowa State University, Center for NDE, 1915 Scholl Road, Ames, IA 50011 ---Nondestructive testing (NDT) for flaws in materials and structures has undergone an evolutionary change over the past 50 years. In the U.S. it has moved from a testing strategy (nondestructive testing) with a zero defects requirement to a test and evaluate technology (NDE) based upon damage tolerant design considerations. Here it is assumed that the part will always contain defects but those greater than a critical size, specified by fracture mechanics, will be removed by NDE inspection thereby resetting the part’s service clock. In this talk, significant events will be identified that were critical in promoting this paradigm shift. A number of major research programs were initiated to upgrade NDT to meet the new requirements; principal attention in this talk will be given to research highlights initiated in the first of these programs, the DARPA/AFML Interdisciplinary Program for Quantitative Flaw Definition that was established 35 years ago. Its purpose was threefold: to develop a new core science/people base for inspection technology that could meet the new requirements, to set the stage for new field - adaptable engineering tools, and to initiate the current continuing series of QNDE meetings. Advances initiated in this program and pursued by many over the years have resulted in a scientific core structure for QNDE based on a linkage of fundamental models of the various measurement processes that are involved in any inspection and/or technology. These models and their linkage will be discussed and the core structure defined. A new and powerful set of engineering tools - i.e. simulation programs for UT, X-ray, and EC technologies –have also been developed using these models. Applications of these tools will be highlighted and their role in other advanced programs including Structural Health Monitoring and Condition-Based Maintenance will be noted. Finally, a discussion of visions of future opportunities and directions for QNDE will be given. - 2 - MONDAY, PLENARY SESSION 2 NDE: Surfing the Electromagnetic Spectrum ---Harry Ringermacher, Sr. Research Physicist, NTL, GE Research Center, KW D254, 1 Research Circle, Schenectady, NY 12309 ---Advances in Nondestructive Evaluation demand an arsenal of techniques. This was as true twenty years ago as it is today. As materials and their associated technologies progress, so must the strategy for evaluating the quality of the product. Nondestructive Evaluation is a constant struggle to extract, from classical and quantum physics, the quintessential elements that will optimally address an inspection requirement, apart from purely academic interest. It must work to be useful and thereby advance the field. The electromagnetic spectrum, from Röntgen to Maxwell/Hertz, lies at the foundation of both classical and quantum physics. Not only has NDE plucked pearls form every nook of the spectrum ranging from X-rays to T-rays but also has managed to utilize virtually every known coupling of the spectrum to the classical mechanics of heat and sound. I will “surf” the spectrum to provide a sampling of what NDE has extracted past and present as well as try to couple to its future. - 3 - MONDAY, PLENARY SESSION 2 NDT in Civil Engineering: Experience and Results of the FOR 384 Research Group ---Herbert Wiggenhauser, BAM, Federal Institute for Materials Research and Testing, Division VIII.2, Non-destructive Damage Assessment and Environmental Measurement Methods, Unter den Eichen 87, D-12205, Berlin, Germany; I. H. W. Reinhardt, Universität Stuttgart, Institut für Werkstoffe im Bauwesen und Otto-Graf-Institut, Pfaffenwaldring 4, 70440 Stuttgart ---The Research Group FOR 384 was funded by the Deutsche Forschungsgemeinschaft (German Research Foundation) between 2001 and 2007, it evolved from an initiative which started much earlier, in 1994 on a spontaneous basis. The group made an combined effort to research "Non-destructive evaluation of concrete structures using acoustic and electro-magnetic echo-methods". Seven research groups from universities, Fraunhofer Foundation and Material Testing Institutes all over Germany formed this group under the speaker Professor HW Reinhardt (University of Stuttgart). The research focused on ultrasonic echo, impact echo, ground penetrating radar, signal analysis, reconstruction and modeling. Performance demonstrations were also included in the work plan. The lessons learned from the history of this group, their operational phase and in the exploitation of the results are presented and discussed. - 4 - Session 3 Monday, July 27, 2009 SESSION 3 UT MODELING M. Hinders, Chairperson CBLS 010 1:30 PM Modeling Elastodynamic Scattering Using Finite Elements ---A. Velichko and P. D. Wilcox, Department of Mechanical Engineering, University of Bristol, Queen’s Building, University Walk, Bristol, BS8 1TR, United Kingdom 1:50 PM Analytical Model for the Scattering of an Obliquely Incident Plane Shear Wave from a Cylindrical Cavity ---J. C. Aldrin, Computational Tools, Gurnee, IL 60031; M. Blodgett, G. Steffes, and E. A. Lindgren, U.S. Air Force Research Laboratory, Wright Patterson AFB, OH 45433 2:10 PM Ultrasonic Measurement Models, Beam Models, and Flaw Scattering Models for Surface Wave and Plate Wave Inspections ---L. W. Schmerr, Jr., Iowa State University, Center for NDE and Department of Aerospace Engineering, Ames, IA 50011 2:30 PM A 2D Model of Ultrasonic Testing for Cracks Near a Non-Planar Surface ---J. Westlund and A. Boström, Department of Applied Mechanics, Chalmers University of Technology, Goteborg, Sweden 2:50 PM Nonlinear Behavior of Ultrasonic Wave at Crack ---N.-Y. Kim, Department of Mechatronic Engineering, Korea University of Technology and Education, Chunan, South Korea; T.-H. Lee, Graduate School of Hanyang University, Seoul, South Korea; K.-Y. Jhang, School of Mechanical Engineering, Hanyang University, Seoul, South Korea; I.-K. Park, Department of Mechanical Engineering, Seoul National University of Technology, Seoul, South Korea 3:10 PM Break 3:30 PM Modeling of Wave Propagation and Defect Detection in Rectangular Bar Specimens ---M. J. Guers and B. R. Tittmann, The Pennsylvania State University, Department of Engineering Science and Mechanics, 212 Earth Engineering Science Building, University Park, PA 16802 3:50 PM Inhomogeneous Interface Waves in a Thin Layer Between Half Spaces and Their Relationship to
Recommended publications
  • Brief Communication: the Role of Geophysical Imaging in Local Landslide Early Warning Systems
    https://doi.org/10.5194/nhess-2021-225 Preprint. Discussion started: 29 July 2021 c Author(s) 2021. CC BY 4.0 License. Brief communication: The role of geophysical imaging in local landslide early warning systems 1 2 1 3 1 Jim S. Whiteley , , Arnaud Watlet , J. Michael Kendall , Jonathan E. Chambers 1Shallow Geohazards and Earth Observation, British Geological Survey, Environmental Science Centre, Nicker Hill, 5 Nottingham, NG12 5GG, United Kingdom. 2School of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol, BS8 1RJ, United Kingdom. 3University of Oxford, Department of Earth Sciences, South Parks Road, Oxford, OX1 3AN, United Kingdom Correspondence to: J.S. Whiteley ([email protected]) Abstract. We summarise the contribution of geophysical imaging to local landslide early warning systems (LoLEWS), 10 highlighting how LoLEWS design and monitoring components benefit from the enhanced spatial and temporal resolutions of time-lapse geophysical imaging. In addition, we discuss how with appropriate laboratory-based petrophysical transforms, these geophysical data can be crucial for future slope failure forecasting and modelling, linking other methods of remote sensing and intrusive monitoring across different scales. We conclude that in light of ever increasing spatiotemporal resolutions of data acquisition, geophysical monitoring should be a more widely considered technology in the toolbox of methods available to 15 stakeholders operating LoLEWS. 1 Introduction Landslide mitigation measures are broadly divided in to two types: engineering approaches to reduce frequency or intensity of failures; and vulnerability reduction measures that de-risk exposed elements (Pecoraro et al., 2019). Here we concentrate on the latter, through the use of landslide early warning systems (LEWS).
    [Show full text]
  • Geophysical Imaging of Permafrost in the SW Svalbard – the Result of Two High Arctic Expeditions to Spitsbergen
    EGU2020-8136, updated on 25 Sep 2021 https://doi.org/10.5194/egusphere-egu2020-8136 EGU General Assembly 2020 © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License. Geophysical imaging of permafrost in the SW Svalbard – the result of two high arctic expeditions to Spitsbergen Mariusz Majdanski1, Artur Marciniak1, Bartosz Owoc1, Wojciech Dobiński2, Tomasz Wawrzyniak1, Marzena Osuch1, Adam Nawrot1, and Michał Glazer2 1Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland ([email protected]) 2Department of Earth Sciences, University of Silesia, Sosnowiec, Poland The Arctic regions are the place of the fastest observed climate change. One of the indicators of such evolution are changes occurring in the glaciers and the subsurface in the permafrost. The active layer of the permafrost as the shallowest one is well measured by multiple geophysical techniques and in-situ measurements. Two high arctic expeditions have been organized to use seismic methods to recognize the shape of the permafrost in two seasons: with the unfrozen ground (October 2017) and frozen ground (April 2018). Two seismic profiles have been designed to visualize the shape of permafrost between the sea coast and the slope of the mountain, and at the front of a retreating glacier. For measurements, a stand-alone seismic stations has been used with accelerated weight drop with in- house modifications and timing system. Seismic profiles were acquired in a time-lapse manner and were supported with GPR and ERT measurements, and continuous temperature monitoring in shallow boreholes. Joint interpretation of seismic and auxiliary data using Multichannel analysis of surface waves, First arrival travel-time tomography and Reflection imaging show clear seasonal changes affecting the active layer where P-wave velocities are changing from 3500 to 5200 m/s.
    [Show full text]
  • Time-Lapse Seismic and Electrical Monitoring of the Vadose Zone During a Controlled Infiltration Experiment at the Ploemeur Hydrological Observatory, France
    water Article Time-Lapse Seismic and Electrical Monitoring of the Vadose Zone during a Controlled Infiltration Experiment at the Ploemeur Hydrological Observatory, France Lara A. Blazevic 1,2,*, Ludovic Bodet 2, Sylvain Pasquet 3 , Niklas Linde 4, Damien Jougnot 2 and Laurent Longuevergne 1 1 CNRS, Géosciences Rennes—UMR 6118, Université Rennes, F-35000 Rennes, France; [email protected] 2 CNRS, EPHE, METIS, Sorbonne Université, F-75005 Paris, France; [email protected] (L.B.); [email protected] (D.J.) 3 Institut de physique du globe de Paris, CNRS, Université de Paris, F-75005 Paris, France; [email protected] 4 Institute of Earth Sciences, University of Lausanne, CH-1015 Lausanne, Switzerland; [email protected] * Correspondence: [email protected] Received: 31 March 2020; Accepted: 21 April 2020; Published: 25 April 2020 Abstract: The vadose zone is the main host of surface and subsurface water exchange and has important implications for ecosystems functioning, climate sciences, geotechnical engineering, and water availability issues. Geophysics provides a means for investigating the subsurface in a non-invasive way and at larger spatial scales than conventional hydrological sensors. Time-lapse hydrogeophysical applications are especially useful for monitoring flow and water content dynamics. Largely dominated by electrical and electromagnetic methods, such applications increasingly rely on seismic methods as a complementary approach to describe the structure and behavior of the vadose zone. To further explore the applicability of active seismics to retrieve quantitative information about dynamic processes in near-surface time-lapse settings, we designed a controlled water infiltration experiment at the Ploemeur Hydrological Observatory (France) during which successive periods of infiltration were followed by surface-based seismic and electrical resistivity acquisitions.
    [Show full text]
  • 3-D Interpretation of Short-Period Magnetotelluric Data at Furnas Volcano, Azores Islands C Hogg, D Kiyan, V Rath, S
    3-D interpretation of short-period magnetotelluric data at Furnas Volcano, Azores Islands C Hogg, D Kiyan, V Rath, S. Byrdina, J. Vandemeulebrouck, A. Revil, F Viveiros, R Carmo, C Silva, T Ferreira To cite this version: C Hogg, D Kiyan, V Rath, S. Byrdina, J. Vandemeulebrouck, et al.. 3-D interpretation of short-period magnetotelluric data at Furnas Volcano, Azores Islands. Geophysical Journal International, Oxford University Press (OUP), 2018, 213 (1), pp.371-386. 10.1093/gji/ggx512. hal-02324333 HAL Id: hal-02324333 https://hal.archives-ouvertes.fr/hal-02324333 Submitted on 23 Nov 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Geophysical Journal International Geophys. J. Int. (2018) 213, 371–386 doi: 10.1093/gji/ggx512 Advance Access publication 2017 November 29 GJI Heat flow and volcanology 3-D interpretation of short-period magnetotelluric data at Furnas Volcano, Azores Islands C. Hogg,1 D. Kiyan,1 V.Rath,1 S. Byrdina,2 J. Vandemeulebrouck,2 A. Revil,2 F. Viveiros,3 R. Carmo,3,4 C. Silva3,4 and T. Ferreira3,4 1DIAS - Geophysics Section, School of Cosmic Physics, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland.
    [Show full text]
  • High-Resolution Reflection Seismic Investigations of Quick
    Journal of Applied Geophysics 92 (2013) 84–102 Contents lists available at SciVerse ScienceDirect Journal of Applied Geophysics journal homepage: www.elsevier.com/locate/jappgeo High-resolution reflection seismic investigations of quick-clay and associated formations at a landslide scar in southwest Sweden Alireza Malehmir a,⁎, Muhammad Umar Saleem a, Mehrdad Bastani b a Uppsala University, Department of Earth Sciences, Villavägen 16, SE75236, Uppsala, Sweden b Geological Survey of Sweden, Villavägen 18, SE75128, Uppsala, Sweden article info abstract Article history: We present high-resolution reflection seismic data from four lines (total 1.9 km) that cross a quick-clay land- Received 12 October 2012 slide scar located close to the shore of the Göta River in southwest Sweden, and compare the results with geo- Accepted 11 February 2013 technical data from boreholes. The seismic data allow the imaging of bedrock topography and normally to Available online 1 March 2013 weakly consolidated sediments to a subsurface depth of about 100 m. Different types of seismic sources, in- cluding sledgehammer, accelerated weight-drop and dynamite were utilized and compared with each other. Keywords: Analysis of their power spectra suggests that weight-drop and dynamite have higher frequency content and Reflection seismic Landslide energy than the sledgehammer, which makes these two sources suitable also for waveform tomography and Quick-clay surface-wave data analysis. The shallowest non-bedrock reflector is observed at about 10–20 m below the Coarse-grained materials surface, it overlays the bedrock, and is interpreted to originate from the contact between clay formations Göta River above and a coarse-grained layer below.
    [Show full text]
  • Bridging the Connection Between Effective Viscosity and Electrical Conductivity Through Water Content in the Upper Mantle
    www.nature.com/scientificreports OPEN Bridging the connection between efective viscosity and electrical conductivity through water content Received: 6 November 2017 Accepted: 15 January 2018 in the upper mantle Published: xx xx xxxx Yixian Xu 1, Anqi Zhang2, Bo Yang1, Xuewei Bao1, Qinyan Wang1, Jianghai Xia1 & Wencai Yang1 Upper mantle viscosity plays a key role in understanding plate tectonics and is usually extrapolated from laboratory-based creep measurements of upper mantle conditions or constrained by modeling geodetic and post-seismic observations. At present, an efective method to obtain a high-resolution viscosity structure is still lacking. Recently, a promising estimation of efective viscosity was obtained from a transform derived from the results of magnetotelluric imaging. Here, we build a relationship between efective viscosity and electrical conductivity in the upper mantle using water content. The contribution of water content to the efective viscosity is isolated in a fow law with reference to relatively dry conditions in the upper mantle. The proposed transform is robust and has been verifed by application to data synthesized from an intraoceanic subduction zone model. We then apply the method to transform an electrical conductivity cross-section across the Yangtze block and the North China Craton. The results show that the efective viscosity structure coincides well with that estimated from other independent datasets at depths of 40 to 80 km but difers slightly at depths of 100 to 200 km. We briefy discussed the potentials and associated problems for application. In multi-scale geodynamic modeling1–3, the investigation of fne-scale deformation in the lithosphere4,5 and inter- pretation of large-scale geophysical data6–8, the spatial variation of efective viscosity plays a key role.
    [Show full text]
  • Event Programme
    Near Surface Modeling & Imaging Workshop, 3rd edition 17–18 March 2019 | Manama, Bahrain EVENT PROGRAMME Gold Sponsor Silver Sponsors Student Registration Coffee Break Sponsor Sponsor DGS seg.org/events/nemi2019 TECHNICAL COMMITTEE CO-CHAIRS TECHNICAL COMMITTEE MEMBERS COMMITTEE CHAIRMAN: Abdulaziz Al Saad, Saudi Aramco Abdallah Ibrahim Abouelelam, Schlumberger Abdulaziz Al-Saad is a geophysicist working in the Geophysical Imaging Department for Saudi Aramco Abdallah Ibrahim Abouelelam graduated in 2005 from Cairo university with a BSc in Geophysics. He worked for Exploration Admin Area, with a focus on near-surface geophysical modeling. Abdulaziz Al-Saad received his 1 year at Cairo university as a geophysics instructor and researcher. He then joined Schlumberger in 2006 in BSc degree in Geophysics from University of New Orleans, Louisiana (USA). His research interests are on the land seismic acquisition, and then joined the seismic data processing in Cairo in 2011, working mainly on land near-surface modeling and borehole geophysics. seismic data processing. He then went to Houston in 2012 to study for the 1-year Area Geophysicists university program. He worked in Lagos, Nigeria as an area geophysicist, giving technical support and hands on work on land and marine and 4D seismic imaging. He is currently based in Cairo as the Middle East and North Africa geophysics lead, looking after the challenges in the area and working on the critical projects and opportunities. COMMITTEE CO-CHAIRMAN: Moosa Al-Jahdhami, Petroleum Development Oman Ahmed Nasr, ION Moosa Al-Jahdhami is a seismic processing geophysicist at Petroleum Development Oman since 2009, holding Ahmed Nasr received a BSc degree in Geophysics from faculty of science Ain Shams University.
    [Show full text]
  • Geophysical Imaging Beneath Lake Chesterfield, Missouri
    Scholars' Mine Masters Theses Student Theses and Dissertations Fall 2019 Geophysical imaging beneath Lake Chesterfield, Missouri James Daniell Hayes Follow this and additional works at: https://scholarsmine.mst.edu/masters_theses Part of the Geological Engineering Commons, and the Geophysics and Seismology Commons Department: Recommended Citation Hayes, James Daniell, "Geophysical imaging beneath Lake Chesterfield, Missouri" (2019). Masters Theses. 7916. https://scholarsmine.mst.edu/masters_theses/7916 This thesis is brought to you by Scholars' Mine, a service of the Missouri S&T Library and Learning Resources. This work is protected by U. S. Copyright Law. Unauthorized use including reproduction for redistribution requires the permission of the copyright holder. For more information, please contact [email protected]. i GEOPHYSICAL IMAGING BENEATH LAKE CHESTERFIELD, MISSOURI by JAMES DANIELL HAYES A THESIS Presented to the Faculty of the Graduate School of the MISSOURI UNIVERSITY OF SCIENCE AND TECHNOLOGY In Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE IN GEOLOGICAL ENGINEERING 2019 Approved by: Dr. Neil Anderson, Advisor Dr. Robert Tucker Dr. Evgeniy Torgashov ii iii ABSTRACT Lake Chesterfield in Wildwood, Missouri, has been leaking since construction of the earth-fill dam was completed in 1986, despite numerous mitigation efforts. The mitigation efforts, including the injection of grouting and the emplacement of clay liners, has not solve the leakage problem. In the current study, geophysical (subsurface imaging) data was acquired across the drained and dry lake bed and along the base of the earth-fill dam to 1) map variable depth to top of bedrock, 2) determine the variable quality of the bedrock to depths on the order of 80 ft., 3) identify any significant karst features beneath the lake, and 4) identify any probable seepage pathways.
    [Show full text]
  • Exploring the Theory of Plate Tectonics: the Role of Mantle Lithosphere Structure
    Article text Click here to download Article text GS_Wilson_Heron_et_al_2017_resub_small.doc View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Aberdeen University Research Archive 1 Exploring the theory of plate tectonics: the role of mantle 2 lithosphere structure 3 Philip J. Heron1,2 *, Russell N. Pysklywec1, and Randell Stephenson3 4 1Department of Earth Sciences, 22 Russell St, University of Toronto, Toronto, Ontario, Canada. 5 2 Now at: Department of Earth Sciences, Durham University, England. 6 3School of Geosciences, University of Aberdeen, Aberdeen, Scotland. 7 * Corresponding author (email: [email protected]). 8 9 Abstract: This review of the role of the mantle lithosphere in plate tectonic processes collates a 10 wide range of recent studies from seismology and numerical modelling. A continually growing 11 catalogue of deep geophysical imaging has illuminated the mantle lithosphere, and with it 12 generated new interpretations of how the lithosphere evolves. Here, we present a review of the 13 current ideas about the role of continental mantle lithosphere in plate tectonic processes. 14 Evidence seems to be growing that scarring in continental mantle lithosphere is rather 15 ubiquitous, which implies a reassessment of the widely-held view that it is inheritance of crustal 16 structure only (rather than the lithosphere as a whole) that is most important in the conventional 17 theory of plate tectonics (e.g., the Wilson Cycle). Recent studies have interpreted mantle 18 lithosphere heterogeneities to be pre-existing structures, and as such linked to the Wilson Cycle 19 and inheritance. We consider the current fundamental questions in the role of the mantle 20 lithosphere in causing tectonic deformation, reviewing recent results alongside highlighting the 21 potential of the deep lithosphere in infiltrating every aspect of plate tectonics processes.
    [Show full text]
  • Imaging of a Fluid Injection Process Using Geophysical Data — a Didactic Example
    GEOPHYSICS, VOL. 85, NO. 2 (MARCH-APRIL 2020); P. W1–W16, 8 FIGS., 1 TABLE. 10.1190/GEO2018-0787.1 Imaging of a fluid injection process using geophysical data — A didactic example Michael Commer1, Steven R. Pride1, Donald W. Vasco1, Stefan Finsterle2, and Michael B. Kowalsky1 occurs during wastewater storage, hydraulic-fracture generation, ABSTRACT CO2 sequestration, enhanced geothermal-energy generation, enhanced oil recovery, groundwater remediation, and underground gas or liquid In many subsurface industrial applications, fluids are in- storage. Any of these applications involve (hydrologic) state changes in jected into or withdrawn from a geologic formation. It is some subsurface system due to fluid injection. Understanding and pre- of practical interest to quantify precisely where, when, and by dicting its impact requires quantitative estimates of not only where the how much the injected fluid alters the state of the subsurface. fluids went once they were injected but also how they altered the state Routine geophysical monitoring of such processes attempts to of the subsurface. As will be outlined in detail, these concepts and image the way that geophysical properties, such as seismic overall goals are distinct from those underlying time-lapse geophysical velocities or electrical conductivity, change through time monitoring approaches such as crosswell seismic (e.g., Landrø and and space and to then make qualitative inferences as to where Stammeijer, 2004; Daley et al., 2008; Marchesini et al., 2017), seismic the injected fluid has migrated. The more rigorous formu- coda monitoring (e.g., Kanu et al., 2014; Obermann et al., 2016), cross- lation of the time-lapse geophysical inverse problem forecasts well electromagnetics (EM) (e.g., Binley et al., 2001; Day-Lewis et al., how the subsurface evolves during the course of a fluid-in- 2003; Marsala et al., 2008), and crosswell electrical resistivity tomog- jection application.
    [Show full text]
  • Geophysical Imaging of Permafrost Conditions Along the Nothern Yukon Alaska Highway
    Geophysical imaging of permafrost conditions along the northern Yukon Alaska Highway Greg A. Oldenborger & Anne-Marie LeBlanc Geological Survey of Canada, Ottawa, ON, Canada Chris W. Stevens SRK Consulting Inc., Anchorage, AK, USA Jason Chartrand Geological Survey of Canada, Ottawa, ON, Canada Benoit Loranger Université Laval, Québec, QC, Canada ABSTRACT Three sections of the northern Yukon Alaska Highway have been identified for testing the usefulness of geophysical surveys for understanding permafrost degradation and assisting with highway management. Results from capacitive resistivity and ground-penetrating radar surveys are analysed and interpreted along with surficial maps, geotechnical borehole records, and surface observations of highway roughness and distress. Observed damage appears to be associated with a variety of ground ice conditions. The geophysical results help elucidate the terrain conditions and support the conclusion that multiple subsurface processes contribute to highway degradation. Several geophysical signatures are interpreted as indicative of terrain conditions involving ice-rich ground, frozen ground, thaw-susceptible sediments and shallow groundwater. RÉSUMÉ Trois sections de la route de l’Alaska - Yukon ont été identifiés pour tester l'utilité de levés géophysiques afin de comprendre la dégradation du pergélisol et aider à la gestion des routes. Les résultats de la résistivité électrique (système couplécapacitivement) et du géoradar sont analysés et interprétés en se basant sur les cartes des dépôts de surface, les -forages géotechniques et les observations sur la rugosité de surface et la dégradation de la route. Les dommages observés semblent être associés à une variété de conditions de glace dans le sol. Les résultats géophysiques aident à élucider les conditions de terrain et appuientla conclusion que des processus multiples sous la surface du terrain contribuent à la dégradation de la route.
    [Show full text]
  • Coherent Diffraction Imaging for Enhanced Fault and Fracture Network Characterization Benjamin Schwarz1 and Charlotte M
    https://doi.org/10.5194/se-2020-87 Preprint. Discussion started: 20 May 2020 c Author(s) 2020. CC BY 4.0 License. Coherent diffraction imaging for enhanced fault and fracture network characterization Benjamin Schwarz1 and Charlotte M. Krawczyk1,2 1GFZ German Research Centre for Geosciences, Albert-Einstein-Str. 42-46, 14473 Potsdam, Germany 2Technical University Berlin, Ernst-Reuter-Platz 1, 10589 Berlin, Germany Correspondence: Benjamin Schwarz ([email protected]) Abstract. Faults and fractures represent unique features of the solid Earth and are especially pervasive in the shallow crust. Aside from directly relating to crustal dynamics and the systematic assessment of associated risk, fault and fracture networks enable the efficient migration of fluids and, therefore, have a direct impact on concrete topics relevant to society, including climate-change mitigating measures like CO2 sequestration or geothermal exploration and production. Due to their small-scale 5 complexity, fault zones and fracture networks are typically poorly resolved and their presence can often only be inferred indi- rectly in seismic and ground-penetrating radar (GPR) subsurface reconstructions. We suggest a largely data-driven framework for the direct imaging of these features by making use of the faint and still often under-explored diffracted portion of the wavefield. Finding inspiration in the fields of optics and visual perception, we introduce two different conceptual pathways for coherent diffraction imaging and discuss respective advantages and disadvantages in different contexts of application. At the 10 heart of both of these strategies lies the assessment of data coherence, for which a range of quantitative measures is introduced. To illustrate the approaches versatility and effectiveness for high-resolution geophysical imaging, several seismic and GPR field data examples are presented, in which the diffracted wavefield sheds new light on crustal features like fluvial channels, erosional surfaces, and intricate fault and fracture networks on land and in the marine environment.
    [Show full text]