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Dr. Paul Denys

BSC (Cant) MSurv (Otago) PhD (Newcastle, UK) DenysPaul

Email: pdenys@surveying.otago.ac.nz
Phone: +64 (0)3 479 7596
Room: Surveying building, 1st floor, Room 125

Profile

Paul joined the School in June 1995. He completed a MSurv degree at Otago University in 1987, after which he lectured for six months at the University of Cape Town. He then worked as a site engineer in London before carrying out a variety of traditional and GPS control surveys and engineering setting out surveys in the oil and exploration industry in Egypt.

In 1991 he undertook studies for a PhD at the University of Newcastle, England (completed 1995) in height determination using ground-based transponders in conjunction with the radar altimeter on the ERS-1 remote sensing satellite. During this time he was appointed as a Research Associate at the University where he was involved in processing of precise GPS networks for projects in Greece, Europe and Britain. He also worked for Racal Survey in the Middle East, Far East and Europe on GPS related projects specific to the off-shore oil and exploration industry.

Since joining Otago University, his primary research focus has involved projects on the deformation of the South Island, vertical uplift of the Southern Alps, the effect of and integration of deformation events (e.g. earthquakes) on geodetic infrastructure and decoupling vertical land movement at tide gauge stations.

Teaching

SURV202 Survey Mathematics (coordinator)
SURV301 Survey Methods (coordinator)
SURV451 Advanced Survey Methods (coordinator)

Research

Research Interests

  • Precise GPS, geodesy, geodetic reference systems
  • Global Navigation Satellite Systems
  • Earth Deformation
  • Sea level rise

Current Projects

Southern Alps Geodetic Experiment (SAGENZ). Using CGPS to measure the rate and distribution of uplift of the Southern Alps.

Fiordland – Co-seismic and Post-seismic deformation. In July 2009, a Mw 7.8 earthquake caused horizontal displacements of up to 80cm in Fiordland, New Zealand.

Sea Level Rise. Monitoring the land movement at New Zealand's long record tide gauges.

Strain and Velocity Fields. Using GPS to measure the velocity field throughout the South Island (New Zealand). Hence determine the strain variability particularly in the Southern Alps and Central Otago.

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Publications

Hamling, I. J., Hreinsdóttir, S., Clark, K., Elliott, J., Liang, C., Fielding, E., … Denys, P., … Pearson, C., … Stirling, M. (2017). Complex multifault rupture during the 2016 Mw 7.8 Kaikōura earthquake, New Zealand. Science, 356(6334), eaam7194. doi: 10.1126/science.aam7194

Beavan, J., Wallace, L. M., Palmer, N., Denys, P., Ellis, S., Fournier, N., … Pearson, C., & Denham, M. (2016). New Zealand GPS velocity field: 1995–2013. New Zealand Journal of Geology & Geophysics, 59(1), 5-14. doi: 10.1080/00288306.2015.1134592

Swales, A., Denys, P., Pickett, V. I., & Lovelock, C. E. (2016). Evaluating deep subsidence in a rapidly-accreting mangrove forest using GPS monitoring of surface-elevation benchmarks and sedimentary records. Marine Geology, 380, 205-218. doi: 10.1016/j.margeo.2016.04.015

Denys, P., Pearson, C., Norris, R., & Denham, M. (2016). A geodetic study of Otago: results of the central Otago deformation network 2004–2014. New Zealand Journal of Geology & Geophysics, 59(1), 147-156. doi: 10.1080/00288306.2015.1134592

Denys, P., & Pearson, C. (2016). Positioning in active deformation zones: Implications for NetworkRTK and GNSS processing engines. Proceedings of the FIG Working Week: Recovery from Disaster. Retrieved from https://www.fig.net/fig2016/proceedings.htm

Chapter in Book - Research

Denys, P. (2013). Geodetic surveying: New Zealand. In M. Strack (Ed.), Survey marks. (pp. 163-170). Dunedin, New Zealand: School of Surveying, University of Otago & the New Zealand Institute of Surveyors.

Denys, P. H., Denham, M., & Pearson, C. F. (2007). A geodetic measurement of strain variation across the Central Southern Alps, New Zealand. In P. Tregoning & C. Rizos (Eds.), Dynamic planet: Monitoring and understanding a dynamic planet with geodetic and oceanographic tools. (pp. 445-452). Berlin: Springer.

Beavan, J., Ellis, S., Wallace, L., & Denys, P. (2007). Kinematic constraints from GPS on oblique convergence of the Pacific and Australian Plates, central South Island, New Zealand. In D. Okaya, T. Stern & F. Davey (Eds.), A continental plate boundary: Tectonics at South Island, New Zealand (Geophysical Monograph Series 175). (pp. 75-94). Washington, DC: American Geophysical Union. doi: 10.1029/175GM05

Jordan, A., Denys, P., & Blick, G. (2007). Implementing localised deformation models into a semi-dynamic datum. In P. Tregoning & C. Rizos (Eds.), Dynamic planet: Monitoring and understanding a dynamic planet with geodetic and oceanographic tools. (pp. 631-637). Berlin: Springer.

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Journal - Research Article

Thom, J., Odolinski, R., McDonald, L., & Denys, P. (2018). On the use of between-baseline differenced and instantaneous RTK positioning while using simultaneous GNSS measurements. Survey Review. Advance online publication. doi: 10.1080/00396265.2018.1460068

Hamling, I. J., Hreinsdóttir, S., Clark, K., Elliott, J., Liang, C., Fielding, E., … Denys, P., … Pearson, C., … Stirling, M. (2017). Complex multifault rupture during the 2016 Mw 7.8 Kaikōura earthquake, New Zealand. Science, 356(6334), eaam7194. doi: 10.1126/science.aam7194

Yong, C. Z., Denys, P. H., & Pearson, C. F. (2017). Present-day kinematics of the Sundaland plate. Journal of Applied Geodesy, 11(3), 169-177. doi: 10.1515/jag-2016-0024

Pearson, C., Manandhar, N., & Denys, P. (2017). Options for developing modernized geodetic datum for Nepal following the April 25, 2015 Mw7.8 Gorkha earthquake. Journal of Applied Geodesy, 11(3), 179-184. doi: 10.1515/jag-2016-0033

Swales, A., Denys, P., Pickett, V. I., & Lovelock, C. E. (2016). Evaluating deep subsidence in a rapidly-accreting mangrove forest using GPS monitoring of surface-elevation benchmarks and sedimentary records. Marine Geology, 380, 205-218. doi: 10.1016/j.margeo.2016.04.015

Beavan, J., Wallace, L. M., Palmer, N., Denys, P., Ellis, S., Fournier, N., … Pearson, C., & Denham, M. (2016). New Zealand GPS velocity field: 1995–2013. New Zealand Journal of Geology & Geophysics, 59(1), 5-14. doi: 10.1080/00288306.2015.1134592

Denys, P., Pearson, C., Norris, R., & Denham, M. (2016). A geodetic study of Otago: results of the central Otago deformation network 2004–2014. New Zealand Journal of Geology & Geophysics, 59(1), 147-156. doi: 10.1080/00288306.2015.1134592

Cox, S. C., Menzies, C. D., Sutherland, R., Denys, P. H., Chamberlain, C., & Teagle, D. A. H. (2015). Changes in hot spring temperature and hydrogeology of the Alpine Fault hanging wall, New Zealand, induced by distal South Island earthquakes. Geofluids, 15(1-2), 216-239. doi: 10.1111/gfl.12093

Fadil, A., Denys, P., Tenzer, R., Grenfell, H. R., & Willis, P. (2013). New Zealand 20th century sea level rise: Resolving the vertical land motion using space geodetic and geological data. Journal of Geophysical Research: Oceans, 118(11), 6076-6091. doi: 10.1002/2013JC008867

Kaiser, A., Holden, C., Beavan, J., Beetham, D., Benites, R., Celentano, A., … Denys, P., … Zhao, J. (2012). The MW 6.2 Christchurch earthquake of February 2011: Preliminary report. New Zealand Journal of Geology & Geophysics, 55(1), 67-90. doi: 10.1080/00288306.2011.641182

Recio, M. R., Mathieu, R., Denys, P., Sirguey, P., & Seddon, P. J. (2011). Lightweight GPS-tags, one giant leap for wildlife tracking? An assessment approach. PLoS ONE, 6(12), e28225. doi: 10.1371/journal.pone.0028225

Gladkikh, V., Tenzer, R., & Denys, P. (2011). Crustal deformation due to atmospheric pressure loading in New Zealand. Journal of Geodetic Science, 1(3), 271-279. doi: 10.2478/v10156-011-0005-z

Denys, P., Denham, M., & Amos, M. (2010). Evaluation of the NZGeoid05 using GPS levelling in rural and elevated locations, South Island, New Zealand. Journal of Spatial Science, 55(2), 205-218. doi: 10.1080/14498596.2010.521972

Beavan, J., Samsonov, S., Denys, P., Sutherland, R., Palmer, N., & Denham, M. (2010). Oblique slip on the Puysegur subduction interface in the 2009 July Mw 7.8 Dusky Sound earthquake from GPS and InSAR observations: Implications for the tectonics of southwestern New Zealand. Geophysical Journal International, 183(3), 1265-1286. doi: 10.1111/j.1365-246X.2010.04798.x

Beavan, J., Denys, P., Denham, M., Hager, B., Herring, T., & Molnar, P. (2010). Distribution of present-day vertical deformation across the Southern Alps, New Zealand, from 10 years of GPS data. Geophysical Research Letters, 37, L16305. doi: 10.1029/2010gl044165

Marshall, A., & Denys, P. (2009). Water level measurement and tidal datum transfer using high rate GPS buoys. New Zealand Surveyor, 299, 24-30.

Wallace, L. M., Beavan, J., McCaffrey, R., Berryman, K., & Denys, P. (2007). Balancing the plate motion budget in the South Island, New Zealand using GPS, geological and seismological data. Geophysical Journal International, 168, 332-352.

Magee, B., & Denys, P. (2005). Accurate velocity assessment of a rowing skiff using kinematic GPS. Geomatica, 59(2), 121-129.

Denys, P. H. (2002). Receiver capabilities and positioning methods used by current day GPS technology. New Zealand Surveyor, 292, 27-34.

Pearson, C. F., Denys, P. H., & Hodgkinson, K. (2000). Geodetic constraints on the kinematics of the Alpine Fault in the southern South Island of New Zealand, using results from the Hawea-Haast GPS transect. Geophysical Research Letters, 27(9), 1319-1323.

Clarke, P. J., Davis, R. R., England, P. C., Parsons, B. E., Billiris, H., Paradissis, D., … Denys, P. H., … Briole, P. (1998). Crustal strain in Central Greece from repeated GPS measurements in the interval 1989-1997. Geophysical Journal International, 135, 195-214.

Clarke, P. J., Davies, R. R., England, P. C., Parsons, B. E., Billiris, H., Paradissis, D., … Denys, P. H., … Bingley, R. (1997). Geodetic estimate of seismic hazard in the Gulf of Korinthos. Geophysical Research Letters, 24(11), 1303-1306.

Denys, P. H., Birks, A. R., Cross, P. A., Powell, P. A., & Pesec, R. J. (1995). Transponder altimetry precise height measurements over land. Journal of Geophysical Research, 100(B12), 24347-24359.

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Journal - Research Other

Stephenson, W. J., Dickson, M. E., & Denys, P. H. (2017). New insights on the relative contributions of coastal processes and tectonics to shore platform development following the Kaikōura earthquake. Earth Surface Processes & Landforms, 42(13), 2214-2220. doi: 10.1002/esp.4176

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Journal - Professional & Other Non-Research Articles

Denys, P. (2010). A note on the accuracy of consumer grade GPS receivers. Survey Quarterly, 62, 20-21.

Denys, P. (2009). A note on GPS signals. Survey Quarterly, 60, 20-21.

Denys, P., Winefield, R., & Jordan, A. (2008). Mapping for earthquakes: Incorporating deformation into datums. Position, 34(April-May), 52-54.

McDaid, D., Denys, P. H., & Hoogsteden, C. C. (1997). Cadastral surveys and the GPS option: origin definition, time and cost comparisons for an urban cadastral survey. Trans Tasman Surveyor, 1(2), 45-52.

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Conference Contribution - Published proceedings: Full paper

Pearson, C., Crook, C., & Denys, P. (2017). The development of a station coordinate estimation program to model time series from continuous GPS stations in New Zealand. In T. van Dam (Ed.) International Association of Geodesy Symposia, (pp. 119-127). Cham, Switzerland: Springer. doi: 10.1007/1345_2015_177

Pearson, C., Crook, C., Jordan, A., & Denys, P. (2016). PositioNZ-PP: An online GPS processing application for New Zealand. In C. Rizos & P. Willis (Eds.) International Association of Geodesy Symposia, (pp. 549-555). Cham, Switzerland: Springer. doi: 10.1007/978-3-319-30895-1

Yong, C. Z., Denys, P., & Pearson, C. (2016). Consequence of 2012 Mw 8.6 Northern Sumatra earthquakes towards Sundaland Plate. Proceedings of the FIG Working Week: Recovery from Disaster. Retrieved from https://www.fig.net/fig2016/proceedings.htm

Pearson, C., Manandhar, N., & Denys, P. (2016). Towards a modernized geodetic datum for Nepal: Options for developing an accurate terrestrial reference frame following the April 25, 2015 Mw7.8 Gorkha earthquake. Proceedings of the FIG Working Week: Recovery from Disaster. Retrieved from https://www.fig.net/fig2016/proceedings.htm

Denys, P., & Pearson, C. (2016). Positioning in active deformation zones: Implications for NetworkRTK and GNSS processing engines. Proceedings of the FIG Working Week: Recovery from Disaster. Retrieved from https://www.fig.net/fig2016/proceedings.htm

Odolinski, R., & Denys, P. (2015). On the multi-GNSS RTK positioning performance in New Zealand. Proceedings of the International Global Navigation Satellite Systems Society (IGNSS) Symposium. Retrieved from http://www.ignss.org/Conferences/PastConferencePapers/2015ConferencePastPapers/2015PeerReviewedPapers/tabid/147/Default.aspx

Denys, P., Norris, R., Pearson, C., & Denham, M. (2014). A geodetic study of the Otago Fault System of the South Island of New Zealand. In C. Rizos & P. Willis (Eds.), Earth on the edge: Science for a sustainable planet. 139, (pp. 151-158). Berlin: Springer. doi: 10.1007/978-3-642-37222-3_19

Tenzer, R., Stevenson, M., & Denys, P. (2012). A compilation of a preliminary map of vertical deformations in New Zealand from continuous GPS data. In S. C. Kenyon, M. C. Pacino & U. J. Marti (Eds.), Geodesy for Planet Earth: International Association of Geodesy Symposia (Vol. 136). (pp. 697-703). Heidelberg, Germany: Springer. doi: 10.1007/978-3-642-20338-1_86

Denys, P., Beavan, J., Thomas, I., & King, M. (2010). A comparison of absolute and relative vertical rates at the New Zealand cGPS@TG sites. Proceedings of the International GNSS Service IGS Workshop and Vertical Rates Symposium. Retrieved from http://www.ceg.ncl.ac.uk/igs2010/

Beavan, J., Denys, P., Denham, M., Hager, B., Herring, T., & Molnar, P. (2010). Distribution of present-day vertical deformation across the Southern Alps, New Zealand, from 10 years of GPS data. Proceedings of the International GNSS Service IGS Workshop and Vertical Rates Symposium. Retrieved from http://www.ceg.ncl.ac.uk/igs2010/

Marshall, A., & Denys, P. (2008). Water level measurement and tidal datum transfer using high rate GPS buoys. Proceedings of the FIG Working Week: Integrating Generations. Retrieved from http://www.fig.net/pub/fig2008/techprog.htm

Denys, P., Winefield, R., & Jordan, A. (2007). Incorporating localised deformation events in dynamic datums. Proceedings of the XXX FIG General Assembly and Working Week. [CD-ROM] Copenhagen, Denmark: International Federation of Surveyors. [Full Paper]

Denham, M., Denys, P., & Vennell, R. (2004). Profit from squat? Dynamic ship's behaviour captured in Otago Harbour, New Zealand. Proceedings of the 4th Trans Tasman Survey Conference of the Institute of New Zealand Surveyors. Auckland, New Zealand: Institute of New Zealand Surveyors. [Full Paper]

Beavan, J., Matheson, D., Denys, P., Denham, M., Herring, T., Hager, B., & Molnar, P. (2004). A vertical deformation profile across the Southern Alps, New Zealand, from 3.5 years of continuous GPS data. In T. van Dam (Ed.), Cahiers de Centre Européen de Géodynamique et Séismologie, Proceedings of the Workshop: The state of GPS vertical positioning precision: Separation of earth processes by space geodesy. 24. [Full Paper]

Smith, J. L., & Denys, P. H. (1998). Extending Real-time GPS data capture to Real-time office data processing. 10th Annual colloquium of Spatial Information Research Centre (SIRC). (pp. 291-297). Dunedin: University of Otago. [Full Paper]

Denys, P. H., Cross, P. A., & Calvert, C. E. (1995). EUREF GB92:SciNet92 to ETRS transformation redefinition. In E. Gubler & H. Hornik (Eds.), Report of the Symposium of the IAG Subcommission for theEuropean Reference Frame (EUREF). (pp. 58-62). Helsinki: International Association of Geodesy. [Full Paper]

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Conference Contribution - Published proceedings: Abstract

Hannah, J., Denys, P. H., & Beavan, R. J. (2010). The determination of absolute sea level rise in New Zealand. Proceedings of the American Geophysical Union (AGU) Fall Meeting. Retrieved from http://www.agu.org/meetings/fm10/waisfm10.html

Gregory, K., Tenzer, R., Denys, P., Hannah, J., Abdalla, A., & Cole, T. (2010). Decoupling the glacial isostatic adjustment and vertical tectonic motions from GPS time series (a case study for New Zealand). Proceedings of the Active Earth Processes Workshop: Joint Workshop of the Department of Geology, National School of Surveying and Department of Marine Science. (pp. 19). Retrieved from http://www.surveying.otago.ac.nz/program.pdf

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