School of Earth and Environment

Roger Clark Dr Roger Clark

Senior Lecturer: Geophysics; Programme Manager: MSc Exploration Geophysics

Telephone number: +44(0) 113 34 35221
Email address: r.a.clark@leeds.ac.uk
Room: 9.158

Biography

Took a Combined Honours BSc in Earth Sciences and Physics at Leeds, then did a seismology PhD on the upper mantle structure beneath the British Isles, at Leeds and MOD Blacknest. Following this he spent some years developing and applying, with Graham Stuart, new approaches in processing of land seismic data and operating a small consultancy/contracts group working on a large fraction of all UK land exploration. At the same time he has pursued global seismology interests, especially in the monitoring of underground nuclear explosions. In 1988 a UK University group, organised from Leeds, deployed the first modern seismic station in the former USSR allowed to record nuclear explosions at close (less than 1000-2000 km) range, facilitating a major new area of study which will be pivotal in verifying arms control treaties.

Further interest (partly in collaboration with the Applied Mathematics Department), are: computation of synthetic seismograms which allow correct representation of small, complex structures which are important in hydrocarbon and coal exploration; and quantitative analyses of reflected wave amplitudes especially their use to determine attenuation, and their variation with angle of incidence.

Publications

  • Kana AA; West LJ; Clark RA (2013) Fracture aperture and fill characterization in a limestone quarry using GPR thin-layer AVA analysis, Near Surface Geophysics, . doi: 10.3997/1873-0604.2012066
  • Gusmeroli A; Murray T; Clark RA; Kulessa B; Jansson P (2013) Vertical seismic profiling of glaciers: appraising multi-phase mixing models, ANNALS OF GLACIOLOGY, 54, pp.115-123. doi: 10.3189/2013AoG64A106
  • Hussein MEA; Odling NE; Clark RA (2013) Borehole water level response to barometric pressure as an indicator of aquifer vulnerability, Water Resources Research, 49, pp.7102-7119. doi: 10.1002/2013WR014134
  • Booth AD; Clark RA; Kulessa B; Murray T; Carter J; Doyle S; Hubbard A (2012) Thin-layer effects in glaciological seismic amplitude-versus-angle (AVA) analysis: Implications for characterising a subglacial till unit, Russell Glacier, West Greenland, Cryosphere, 6, pp.909-922. doi: 10.5194/tc-6-909-2012
  • Reine C; Clark RA; van der Baan M (2011) Robust pre-stack Q determination using surface seismic data - I. Method and synthetic examples, Geophysics, .
  • Reine C; Clark RA; van der Baan M (2011) Robust pre-stack Q determination using surface seismic data - II. 3D case study, Geophysics, .
  • Booth AD; Clark RA; Murray T (2011) Resolution and precision of semblance-based GPR velocity analysis by Monte-Carlo simulation, Near Surface Geophysics, .
  • Booth AD; Clark RA; Murray T (2011) Influences on the resolution of GPR velocity analyses and a Monte Carlo simulation for establishing velocity precision, Near Surface Geophysics, 9, pp.399-411. doi: 10.3997/1873-0604.2011019
  • Gusmeroli A; Clark RA; Murray T; Booth AD; Kulessa B; Barrett BE (2010) Seismic wave attenuation in the uppermost glacier ice of Storglaciaren, Sweden, J GLACIOL, 56, pp.249-256.
  • Booth AD; Clark RA; Murray T (2010) Semblance response to a ground penetrating radar wavelet and resulting errors in velocity analysis, Near Surface Geophysics, 8, pp.235-246. doi: 10.3997/1873-0640.2010008
  • Blanchard TD; Clark RA; Van Der Baan M (2010) Seperating pressure and saturation changes using attenuation measurements from time-lapse prestack seismic data, 72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010, 7, pp.4786-4790.
  • Moffat LC; Clark RA; Van Der Baan M; Manning T (2010) Azimuthal anisotropy characterization using 3D multi-azimuth towed streamer dataset, 72nd European Association of Geoscientists and Engineers Conference and Exhibition 2010: A New Spring for Geoscience. Incorporating SPE EUROPEC 2010, 3, pp.1927-1931.
  • Booth AD; Clark RA; Hamilton K; Murray T (2010) Multi-Offset Ground Penetrating Radar Methods to Image Buried Foundations of a Medieval Town Wall, Great Yarmouth, UK, ARCHAEOL PROSPECT, 17, pp.103-116. doi: 10.1002/arp.377
  • Catt LML; West LJ; Clark RA (2009) The use of reference models from a priori data to guide 2D inversion of electrical resistivity tomography data, GEOPHYS PROSPECT, 57, pp.1035-1048. doi: 10.1111/j.1365-2478.2008.00774.x
  • Blanchard TD; Clark RA; Van Der Baan M; Laws E (2009) Time-lapse attenuation as a tool for monitoring pore fluid changes in hydrocarbon reservoirs, 71st European Association of Geoscientists and Engineers Conference and Exhibition 2009: Balancing Global Resources. Incorporating SPE EUROPEC 2009, 1, pp.171-175.
  • Reine CA; Clark RA; Van Der Baan M (2009) Interval-Q measurements from surface seismic data using a robust prestack inversion algorithm, 71st European Association of Geoscientists and Engineers Conference and Exhibition 2009: Balancing Global Resources. Incorporating SPE EUROPEC 2009, 4, pp.2167-2171.
  • Clark RA; Benson PM; Carter AJ; Moreno CAG (2009) Anisotropic P-wave attenuation measured from a multi-azimuth surface seismic reflection survey, GEOPHYS PROSPECT, 57, pp.835-845. doi: 10.1111/j.1365-2478.2008.00772.x
  • Reine C; van der Baan M; Clark RA (2009) The robustness of seismic attenuation measurements using fixed- and variable-window time-frequency transforms, Geophysics, 74, pp.WA123-WA135.
  • Johnston L; Wilson GS; Gorman AR; Henrys SA; Horgan H; Clark RA; Naish TR (2008) Cenozoic basin evolution beneath the southern McMurdo Ice Shelf, Antarctica, Global and Planetary Change 62, 62, pp.61-76. doi: 10.1016/j.gloplacha.2007.11.004
  • Gusmeroli A; Murray T; Barrett BE; Clark RA; Booth AD (2008) Estimates of water content in glacier ice using vertical radar profiles: a modified interpretation for the temperate glacier Falljökull, Iceland, Journal of Glaciology, 54, pp.939-942.
  • Barrett BE; Murray T; Clark RA; Matsuoka K (2008) Distribution and character of water in a surge-type glacier revealed by multifrequency and multipolarization ground-penetrating radar, Journal of Geophysical Research, 113, . doi: 10.1029/2007JF000972
  • Murphy P; Westermann AR; Clark RA; Parr A (2008) Enhancing understanding of breakdown and collapse in the Yorkshire Dales using ground penetrating radar on cave sediments, Engineering Geology, 99, pp.160-168. doi: 10.1016/j.enggeo.2007.11.015
  • Booth AD; Linford NT; Clark RA; Murray T (2008) Three-dimensional, multi-offset ground-penetrating radar imaging of archaeological targets, ARCHAEOL PROSPECT, 15, pp.93-112. doi: 10.1002/arp.327
  • Barrett BE; Murray T; Clark RA (2007) Errors in radar CMP velocity estimates due to survey geometry, and their implications for ice water content estimation, Journal of Environmental & Engineering Geophysics, 12, pp.101-111.
  • Clark RA (2006) Geophysical measurement of cave geometry and sediment fill in a karst environment: Hull Pot, North Yorkshire, UK, Near Surface Geophysics , .
  • Louis FI; Clark RA; Louis IF; Makropoulos CC (2005) Nondestructive imaging of small size voids at Akrotiri archaeological site, Thera Island, Greece, by seismic inversion techniques, J APPL GEOPHYS, 57, pp.306-326. doi: 10.1016/j.jappgeo.2005.04.001
  • Woodward J; Murray T; Clark RA; Stuart GW (2003) Glacier surge mechanisms inferred from ground-penetrating radar: Kongsvegen, Svalbard, J GLACIOL, 49, pp.473-480.
  • Quinn RK; Clark RA; Neuberg JW (2001) The AVA (amplitude-versus-angle) signature of small-scale reflector topography, GEOPHYS PROSPECT, 49, pp.59-70.
  • Griffiths H; Clark RA; Thorp KM; Spencer S (2000) Strain accommodation at the lateral margin of an active transpressive zone: geological and seismological evidence from the Lebanese restraining bend, Journal of the Geological Society, 157, pp.289-302.
  • Hustedt B; Clark RA (1999) Source/receiver array directivity effects on marine seismic attenuation measurements, Geophysical Prospecting, 47, pp.1105-1119.
  • Clark RA (1998) Geophysical Journal International(Editorship), Geophysical Journal International, .
  • Dasgupta R; Clark RA (1998) Estimation of Q from surface seismic reflection data, Geophysics, 63, pp.2120-2128.
  • van Moyland S; Clark RA (1998) The paper trail, Bulletin of the Atomic Scientists, 54, pp.26-29.
  • Clark RA; Chung E; Deslandes E; Iyayi L; Pollatos J (Not yet published) Measurements of frequency-dependent Q in near-surface geological materials using refraction seismic data., Geophysics, .
  • Barrett BE; Murray T; Clark RA (Not yet published) An alternative interpretation of the englacial distribution of radar scatterers in Bakaninbreen, Svalbard, Journal of Glaciology, .