44 results found
D'Arcy M, Mason PJ, Roda-Boluda DC, et al., 2018, Alluvial fan surface ages recorded by Landsat-8 imagery in Owens Valley, California, REMOTE SENSING OF ENVIRONMENT, Vol: 216, Pages: 401-414, ISSN: 0034-4257
Lawrence J, Agar S, Ghail R, et al., 2018, PSInSAR remote sensing observations of deformation behaviour at Salisbury Plain, UK, Engineering in Chalk, Pages: 269-274
PSInSAR is a radar remote sensing approach that offers measurements of ground deformation over large areas at sub-mm precision. The technique has significant potential for granting insight into ongoing geological processes. Data recovery in rural areas is challenging due to the highly inconsistent radar scattering behaviour exhibited by vegetated ground, and thus a rural area of the UK – Salisbury Plain - was used as a case study to examine the challenges and potential for PSInSAR techniques in rural areas. Results showed regional uplift of clay formations relative to the Chalk, which was attributed to clay shrink-swell correlated with seasonal increases in groundwater levels.
Ghail RC, Hall D, Mason PJ, et al., 2018, VenSAR on EnVision: Taking earth observation radar to Venus, INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION, Vol: 64, Pages: 365-376, ISSN: 0303-2434
Mason P, 2018, The Earth as a planet, International Journal of Remote Sensing, Pages: 5767-5769, ISSN: 0143-1161
Liu J, Mason PJ, Bryant EC, 2018, Regional assessment of geohazard recovery eight years after the Mw7.9 Wenchuan earthquake: a remote-sensing investigation of the Beichuan region, International Journal of Remote Sensing, Vol: 39, Pages: 1671-1695, ISSN: 0143-1161
The earthquake of 12 May 2008 in Wenchuan County, Sichuan Province, China, devastated the entire Beichuan region. Sitting at the intersection of the Yingxiu-Beichuan and Pengguan faults, the region experienced seismic intensities of VIII–XI on the Liedu scale. High seismic intensity combined with inherent geomorphological and climatic susceptibility to slope failure resulted in widespread co-seismic geohazards (slope failures of various types), which decimated the region. The seismic characteristics of the Wenchuan earthquake and the co-seismic geohazard distribution in relation to various conditioning factors have previously been examined in depth. However, there has been a lack of regional assessment of temporal and spatial recovery from co-seismic geohazards. Triggered by the authors’ field observation of rapid recovery, this study presents a temporal series of geohazard maps, produced by manual interpretation of satellite imagery, to present an initial assessment of changes in geohazard occurrence in the Beichuan region since the Wenchuan earthquake. In particular, landscape recovery at the co-seismic geohazard sites, as indicated by re-vegetation, is analysed based on temporal/spatial characteristics of geohazard distribution, in relation to co-seismic deformation, distance from the rupture zone and slope angle. Eight years after the Wenchuan earthquake, the overall recovery stands at 65.48%, with approximately uniform annual rates of recovery at 13.45% a year between 2009 and 2011 and 10.56% a year between 2012 and 2016. Whilst co-seismic geohazards are concentrated on the hanging wall of the seismic fault, landscape recovery is more significant in the very highly deformed zone than in other areas. Recovery has been the greatest on slopes of <50° and peaks on 40°–50° slopes, where the area occupied by co-seismic geohazards was the largest. The block-slides and rock topples, which characterize high angle slopes, show much slower
Neal LC, Wilkinson JJ, Mason PJ, et al., 2018, Spectral characteristics of propylitic alteration minerals as a vectoring tool for porphyry copper deposits, JOURNAL OF GEOCHEMICAL EXPLORATION, Vol: 184, Pages: 179-198, ISSN: 0375-6742
Singh A, Thomsen KJ, Sinha R, et al., 2017, Counter-intuitive influence of Himalayan river morphodynamics on Indus Civilisation urban settlements, NATURE COMMUNICATIONS, Vol: 8, ISSN: 2041-1723
Toms E, Mason PJ, Ghail RC, 2016, Drift-filled hollows in Battersea: investigation of the structure and geology along the route of the Northern Line Extension, London, QUARTERLY JOURNAL OF ENGINEERING GEOLOGY AND HYDROGEOLOGY, Vol: 49, Pages: 147-153, ISSN: 1470-9236
van Dijk WM, Densmore AL, Singh A, et al., 2016, Linking the morphology of fluvial fan systems to aquifer stratigraphy in the Sutlej-Yamuna plain of northwest India, JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, Vol: 121, Pages: 201-222, ISSN: 2169-9003
Mason PJ, Ghail RC, Bischoff C, et al., 2015, Detecting and monitoring small-scale discrete ground movements across London, using Persistent Scatterer InSAR (PSI), XVI ECSMGE, Publisher: ICE Publishing
The geology of London is surprisingly poorly understood and, until recently, has been accepted as that of an unfaulted subsidingintraplate basin. The detection of deformation in such quiescent intraplate regions is, however, rather difficult since the movementrates are at least an order of magnitude less than those at plate margins. Growing evidence from across the capital indicates that London'sground conditions are considerably more complex than expected and that faulting is almost always involved.PSInSAR is a developing technique widely used to detect and monitor ground subsidence, especially in urban settings, the movements ofwhich may be up to tens of millimetres. This work focuses on the detection of smaller scale ground movements (of a few millimetres),which we believe are caused by fault-controlled intraplate adjustments, using PSInSAR.The London PSInSAR dataset derives from an imaging SAR archive spanning 18 years (1992 - 2000 and 2001 to 2010). Our preliminaryfindings have revealed systematic patterns of both vertical and horizontal ground displacement. These displacements appear to be faultconstrained and fit the predicted framework of Caledonian, Variscan/Alpine structures known to exist across southern Britain. More detailedanalysis has revealed some surprising patterns, which hint at discrete movements rather than continuous 'creep' over the 18 year period;we believe these are driven by basement faults beneath an inverting London basin.
Singh A, Gupta S, Sinha R, et al., Large–scale avulsion of the late Quaternary Sutlej river in the NW Indo–Gangetic foreland basin, European Geosciences Union General Assembly 2015
River avulsions are important processes in the spatial evolution of river systems in tectonically active sedimentary basins as they govern large–scale patterns of sediment routing. However, the pattern and timing of avulsions in large river systems are poorly documented and not well understood. Here we document late Quaternary paleo– river channel changes in the Indo–Gangetic basin of northwest India. Using a combination of satellite remote sensing and detailed sediment coring, we analyse the large–scale planform geometry, and detailed sedimentary andstratigraphic nature of a major fluvial sedimentary deposit in the shallow subsurface. This sediment body records aggradation of multiple fluvial channel fills. Satellite remote sensing analysis indicates the trace of the buried channel complex and demonstrates that it exists in region of the Himalayan foreland where no major rivers are currently present. Thus it records the former drainage pathway of a major river, which has since been diverted. We use optically stimulated luminescence dating techniques to develop an age model for the stratigraphic succession and hence constrain the timing of river channel existence and diversion. Provenance analysis based on U–Pb dating of detrital zircons and detrital mica Ar–Ar ages indicate sediment sources in the Higher Himalayan Crystalline andLesser Himalayan Crystalline Series indicating that this paleo–river channel system formed a major perennial river derived from the main body of the Himalaya. Specifically we are able to fingerprint bedrock sources in thecatchment of the present–day Sutlej river indicating that the paleo–fluvial system represents the former course of the Sutlej river prior to a major nodal avulsion to its present day course. Our results indicate that on geologically relatively short time–scales, we observe dramatic along strike shifts in the location of major Himalayan rivers. Our sediment records
, 2015, The geological context and evidence for incipient inversion of the London Basin, Pages: 3523-3528
© The authors and ICE Publishing: All rights reserved, 2015. A reappraisal of ground investigation data across London reveal that a range of unexpected ground conditions, encountered in engineering works since Victorian times, may result from the effects of ongoing inversion of the London Basin. Site investigation borehole data and the distribution of river terrace deposits of the Thames and its tributaries reveal a complex pattern of block movements, tilting and dextral transcurrent displacement. Significant displacements (∼10 m) observed in Thames terrace gravels in borehole TQ38SE1565 at the Lower Lea Crossing, showing that movement has occurred within the last ∼100 ka. Restraining bends on reactivated transcurrent faults may explain the occurrence of drift filled hollows, previously identified as fluvially scoured pingos, by faulting and upward migration of water on a flower structure under periglacial conditions. Mapping the location of these features constrains the location of active transcurrent faults and so helps predict the likelihood of encountering hazardous ground conditions during tunnelling and ground engineering.
Turconi L, Tropeano D, Savio G, et al., 2015, Landscape analysis for multi-hazard prevention in Orco and Soana valleys, Northwest Italy, NATURAL HAZARDS AND EARTH SYSTEM SCIENCES, Vol: 15, Pages: 1963-1972, ISSN: 1561-8633
Ghail RC, Jacqueline S, Mason PJ, 2015, Identification of Ground Engineering Hazards in London Through the Use of Predictive 4D Geomodelling Tools, 12th International IAEG Congress, Publisher: SPRINGER INT PUBLISHING AG, Pages: 907-911
Wu M-C, Liu J, Cosgrove J, et al., 2014, Modelling of Yingxiu-Seichuan fault zone based on refined DInSAR data of 2008 Wenchuan earthquake, TECTONOPHYSICS, Vol: 630, Pages: 193-207, ISSN: 0040-1951
Barrott JJ, Dudeney AWL, Mason PJ, 2014, Spatial and temporal relationships between Eocene sand horizons and iron contamination in stream water in the Thames Basin west of London, UK, Geochemistry-Exploration Environment Analysis, Vol: 14, Pages: 33-44, ISSN: 1467-7873
Analyses of stream water samples associated with Tertiary (Eocene) sands of the Bracklesham Formation 30–60 km west of London showed numerous occurrences of groundwater containing elevated iron(II) concentrations (1–15 mg/l Fe), which oxidise to red-brown ferrihydrite in localised wetlands and streams and join onward flows towards the River Thames. GIS mapping of iron concentrations in relation to topographical and geological data within a 20×30 km project area indicated some 168 km of iron-contaminated water.The results are consistent with downward permeation of groundwater through contained Camberley, Windlesham and Bagshot sand horizons and predominant W-E groundwater flow of up to 35 km in the Bagshot horizon, which rests on impermeable London Clay. Glauconite, comprising up to 70% of the sand near the base of the Windlesham horizon, apparently provides the main source of soluble iron in the near-anoxic, near-neutral, conditions normally prevailing. Pyrite is also a possible source, especially where quarrying or other excavation releases water from previously isolated volumes, simultaneously causing elevated sulphate and acidity levels via relatively rapid sulphide oxidation. Mechanisms proposed are underpinned through comparison with reports on analogous systems in the UK and abroad.Streams and lakes in the vicinity of seepages are highly visible and of decreased biodiversity. However, because of their natural origin, they are not subject to the same public concern and environmental control as compositionally similar near-neutral water from many former coal mines elsewhere - where iron derives primarily from pyrite. Also, while comparatively persistent, they appear destined for rapid depletion in geological terms: the unusual isolation of the sands until the Quaternary indicates a short leaching period and suggests a reason why iron-rich water from natural ferruginous sands is seldom of sufficient significanc
Runqiu H, Hanhu L, 2013, Earthquake damage zone GIS modelling: A modulation between co-seismic deformation and landslide susceptibility, Pages: 269-277
In mountainous regions, earthquake events are typical of naturally-occurring multiple hazards and are frequently the trigger for cascade effects which range from the destruction of the initial shock, to extensive and complex slope failures in the immediate, short and very long-term. The conventional seismic intensity zonationmethod cannot adequately characterise both the current damage level and long-term geohazards, while detailed information is critical in guiding postdisastermitigation and regional development. In studying themost severely damagedBeichuan area by the Mw7.9Wenchuan earthquake, we proceeded with a qualitative numerical method for earthquake damage zonemapping which is novel in its integration of the multi-variable GIS modelling of geohazard susceptibility with co-seismic deformation via amodulation. This new model, we call it earthquake damage, characterise not only the destruction immediately after an earthquake but also the potential for future damage as the consequences of the earthquake. © Springer-Verlag Berlin Heidelberg 2013.
Wu M-C, Liu JG, Mason PJ, 2013, Adaptive local kriging to retrieve slant-range surface motion maps of the Wenchuan earthquake, INTERNATIONAL JOURNAL OF REMOTE SENSING, Vol: 34, Pages: 7589-7606, ISSN: 0143-1161
Liu JG, Mason PJ, 2013, Essential image processing and GIS for remote sensing, ISBN: 9781118687963
© 2009 by John Wiley & Sons Ltd. All rights reserved. Essential Image Processing and GIS for Remote Sensing is an accessible overview of the subject and successfully draws together these three key areas in a balanced and comprehensive manner. The book provides an overview of essential techniques and a selection of key case studies in a variety of application areas. Key concepts and ideas are introduced in a clear and logical manner and described through the provision of numerous relevant conceptual illustrations. Mathematical detail is kept to a minimum and only referred to where necessary for ease of understanding. Such concepts are explained through common sense terms rather than in rigorous mathematical detail when explaining image processing and GIS techniques, to enable students to grasp the essentials of a notoriously challenging subject area. The book is clearly divided into three parts, with the first part introducing essential image processing techniques for remote sensing. The second part looks at GIS and begins with an overview of the concepts, structures and mechanisms by which GIS operates. Finally the third part introduces Remote Sensing Applications. Throughout the book the relationships between GIS, Image Processing and Remote Sensing are clearly identified to ensure that students are able to apply the various techniques that have been covered appropriately. The latter chapters use numerous relevant case studies to illustrate various remote sensing, image processing and GIS applications in practice.
Liu JG, Mason PJ, Yu E, et al., 2012, GIS modelling of earthquake damage zones using satellite remote sensing and DEM data, GEOMORPHOLOGY, Vol: 139, Pages: 518-535, ISSN: 0169-555X
Wu M-C, Liu JG, Yan H, et al., 2012, THREE-DIMENSIONAL SURFACE DISPLACEMENT MAP OF THE 2008 WENCHUAN EARTHQUAKE DERIVED FROM PHASE CORRELATION (PC) SUB-PIXEL OFFSET METHOD AND ADAPTIVE LOCAL KRIGING (ALK) DInSAR DATA, IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Publisher: IEEE, Pages: 3899-3902, ISSN: 2153-6996
Bishop CA, Liu JG, Mason PJ, 2011, Hyperspectral remote sensing for mineral exploration in Pulang, Yunnan Province, China, INTERNATIONAL JOURNAL OF REMOTE SENSING, Vol: 32, Pages: 2409-2426, ISSN: 0143-1161
Ismail NAFB, Kamarudin SN, Rahim MSBM, et al., 2010, Visualisation of Earth Deformation in 2D, 2nd International Conference on Computational Intelligence Communication Systems and Networks (CICSyN), Publisher: IEEE COMPUTER SOC, Pages: 320-325
Fourniadis IG, Liu JG, Mason PJ, 2007, Regional assessment of landslide impact in the Three Gorges area, China, using ASTER data: Wushan-Zigui, LANDSLIDES, Vol: 4, Pages: 267-278, ISSN: 1612-510X
, 2007, Regional assessment of landslide impact in the Three Gorges area, China, using ASTER data: Wushan-Zigui, Landslides, Vol: 4, Pages: 267-278, ISSN: 1612-510X
This paper is focussed on the hazard impact of landslides in the Three Gorges, and represents the progression of our ongoing study on regional land instability assessment in the Three Gorges area using imagery data from the Advanced Spaceborne Thermal Emission Radiometer (ASTER). The key development here is the establishment of a model that integrates land instability with several factors that can relate hazard to human life, such as slope failures occurring in proximity to built-up areas and roads, and areas of high landslide risk along the bank of Yangtze and its major tributaries. The method correctly identifies some of the known destructive landslides in the region, like Qianjiangping and Huangtupo, as belonging to areas of potentially high landslide impact. Our results suggest that several population centres, including the towns of Wushan and Badong, are rated at high landslide hazard levels. This study highlights the importance of differentiating between landslide types within susceptibility assessment, and identifies those locations in the Three Gorges where the probability of landslide occurrence with negative impact to life and property is greatest. © 2007 Springer-Verlag.
, 2007, Landslide hazard assessment in the Three Gorges area, China, using ASTER imagery: Wushan-Badong, Geomorphology, Vol: 84, Pages: 126-144, ISSN: 0169-555X
The objectives of this study are to develop a methodology for regional scale assessment of landslide hazard using remotely sensed data, and to produce a landslide hazard map of the Wushan-Badong area in the Three Gorges, China, from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) images. The area is undergoing rapid urban development, with slope instability causing a widespread natural hazard. Landslide-related parameters were largely estimated through image processing and visual interpretation of ASTER multi-spectral and topographic data. We used field measurements to define the quantification for three parameters: (a) slope angle in relation to lithology; (b) distance to drainage network in relation to stream order; and (c) distance to tectonic lineament in relation to lineament length. We employed a multi-parameter elimination and characterization model, based on estimation of the geometric mean, to remove areas where landslides are not expected to occur, and classify the remaining areas into landslide hazard categories. Our results show increased landslide hazard in and around Wushan and Badong Towns, as well as other populated areas along the Yangtze and its tributaries. We used field data on landslide distribution to identify typical geomorphological settings for different landslide types, and to provide ground control for the hazard assessment. The results indicate good correlation between classified high-hazard areas and field-confirmed slope failures, and show the usefulness of ASTER imagery for landslide hazard assessment at a regional scale. © 2006 Elsevier B.V. All rights reserved.
Fourniadis IG, Liu JG, Mason PJ, 2007, Landslide hazard assessment in the Three Gorges area, China, using ASTER imagery: Wushan-Badong, GEOMORPHOLOGY, Vol: 84, Pages: 126-144, ISSN: 0169-555X
Liu J G, Mason PJ MA J, 2006, Measurement of the left-lateral displacement of Ms 8.1 Kunlun earthquake on 14 November 2001 using Landsat-7 ETM+ imagery, International Journal of Remote Sensing, Vol: 27, Pages: 1875-1891
Liu JG, Mason PJ, Ma JM, 2006, Measurement of the left-lateral displacement of Ms 8.1 Kunlun earthquake on 14 November 2001 using Landsat-7 ETM + imagery, INTERNATIONAL JOURNAL OF REMOTE SENSING, Vol: 27, Pages: 1875-1891, ISSN: 0143-1161
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