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Assoc Prof Andrew R Gorman

Andrew GormanBSc(Calgary) PhD(Br Col)

Geophysics

 

Office - Geology 2S03

Tel 64 3 479 7516

Email andrew.gorman@otago.ac.nz
 
 

Contact for

Undergraduate course advice, geophysics

Teaching

100-level

200 Level

300 Level

400 Level

Research Interests

My research interests are in the application of geophysical analytical techniques to geological problems. Currently, my research ranges across the spectrum of controlled-source seismology: from high-resolution marine reflection seismology to lithosphere-scale refraction seismology. Some of my main focuses these days are the examination of gas hydrates on the continental shelf, the use of high-resolution seismic methods to image seafloor sedimentary units and the characterisation of fault structures on the South Island of New Zealand.

Gas hydrates research is currently centred on New Zealand's continental margins - primarily the Hikurangi Margin off the east coast of the North Island. Extensive data sets of petroleum industry (and other) data facilitate the characterisation of these ice-like compounds of natural gas (mostly methane) and water within the ocean floor sediments. In collaboration with researchers at New Zealand's GNS Science and the National Institute of Water and Atmospheric Research (NIWA), the University of Auckland and elsewhere, we are (1) investigating the distribution and concentration of this significant hydrocarbon resource, (2) examining the role that hydrates play in the global climate cycle, and (3) evaluating the link between hydrate deposits and sea floor instabilities. The new high-frequency seismic capabilities of the University of Otago’s research vessel, RV Polaris II , are being used to examine features within the upper 500 m of the seafloor that may be related to underlying hydrate accumulations.

Land seismic methods can be used to constrain the position of faults at depth – primarily by imaging the geological units on either side of the fault and interpreting how the fault has moved between them. In collaboration with structural geology colleagues, I am conducting research into the shallow structure of the Alpine Fault and other fault system on and around the South Island. In particular, I am using the University of Otago’s 48-channel land-based seismic system to collect reflection seismic datasets that characterise the sedimentary basins associated with the Alpine Fault, and the boomer seismic system on board RV Polaris II to image faults along the east coast of the South Island.

Current Students

Sebastian Clar (PhD) – Seismic oceanography used to investigate temporal variability in oceanographic processes at multiple scales southeast of the South Island

Joanna Cooper (PhD) – Investigating water-mass mixing across the Sub-tropical Front east of the South Island using seismic oceanography (Co-supervised by Dr. Ross Vennell, Marine Science)

Patrick Fletcher (MSc) – Gas hydrates in the Pegasus Basin

Douglas Fraser (PhD) – Seismic characterisation of hydrate / shallow gas systems associated with active margin sediments in the Pegasus Sub-basin, Hikurangi Margin, New Zealand (Co-supervised by Dr. Ingo Pecher, University of Auckland).

Jasper Hoffmann (PhD) – Paleoenvironmental controls on fluid flux in the vicinity of the Waitaki Canyon on the South Canterbury Continental Shelf.

Adrienn Lukacs (PhD) – Geophysical characterisation of the Alpine Fault through and beneath the Whataroa Valley, Westland, New Zealand.

Tim Lutter (MSc) – Integrating new and existing gravity data to model the structures of the upper crust of the Dunedin volcano

James Ashley (MSc) (on hold)– New Zealand surface heat flow and its tectonic implications (Co-supervised by Dr. Rob Funnell, GNS Science).

Jeremy Kilner (MSc) (on hold)- Seismic imaging of eastern Otago active fault structures (Co-supervised by Prof. Richard Norris.)

Ben Ross (MSc on hold) – Glacial processes on the eastern fiords of the Auckland Islands (Co-supervised by Prof. Gary Wilson)

Former Students

Andy Holt (MSc 2016) – Seismic characterisation of offshore faulting along the South Otago coast.

Ted Perkins (MSc 2016) – Seismic imaging of the Auckland Island eastern shelf Quaternary channel system.

Cameron Abbey (MSc 2016) - Seismic characterisation of submarine canyons off the Otago coast

Patrick Fletcher (BSc (Hons)) - A seismic and sedimentological study of Otago Harbour

Dylan Baker (MSc 2016) - Gas hydrates in the Pegasus Basin, New Zealand

Mike Krause (MSc) – High-resolution multi-channel seismic boomer imaging of Holocene sedimentation in Lake Ohau

Patrick Lepine (MSc 2016) – Seismic characterisation of the sedimentary fill of the Whataroa glacial valley in the vicinity of the Alpine Fault, Westland.

Laurine van Haastrecht (MSc 2016) - Characterisation of the Ross Ice Shelf in the vicinity of the upcoming Hot Water Drill Site 2.

Jess Hillman (PhD 2015) - Investigation of seafloor depression formation on the Chatham Rise, New Zealand to better understand climate-driven methane release from gas hydrates

Christine McLachlan (MSc 2015) – Characterisation of the Saunders Ridges, Possible Otago Shelf transgressive beach ridges (Co-supervised by Prof. Gary Wilson)

Erin Dlabola (MSc 2014) – Understanding Last Glacial Maximum sediment accumulations in the New Zealand fiords from gravity coring and seismic data (Co-supervised by Prof. Gary Wilson)

Tim Lennon (MSc 2014)– Geophysical exploration offshore Stewart Island (sponsored by GeoSphere Ltd. through a TEC Enterprise Scholarship.)

Callum Bruce (MSc 2013) – Seismic imaging of natural gas occurrences and migration pathways in the seafloor of the Reinga Basin, west of Northland.

Betina Flemming (BSc(Hons) 2012) – Characterisation of the modern sand wedge on the South Otago shelf (Co-supervised by Dr. Chris Moy).

Matthew Smillie (MSc 2012) -  Seismic oceanographical imaging of the ocean southeast of NZ.

Daniel Jones (MSc 2012) – Geophysical characterisation of the Foulden Hills Maar, Central Otago, New Zealand (Co-supervised by Prof. Gary Wilson).

Paul Viskovic (MSc 2011) - Fluid flux through the seafloor of the Great South Basin (sponsored by OMV New Zealand through a TEC Enterprise Scholarship.)

Callum Bruce (BSc Hons 2010) – Shallow marine seismic characterisation of coast-parallel faulting south of Dunedin.

Amy Shears (MSc – EnvSci 2010) - Characterisation of the sediment budget of Otago Harbour (Co-supervised by Dr. Abby Smith, Marine Science)

Gareth Crutchley (PhD 2009) - Gas hydrate characterisation on the Hikurangi Continental Margin (Co-supervised by Dr. Ingo Pecher, GNS Science).

Miko Fohrmann (PhD 2009) - Examination of marine seismic reflection data for the occurrence and distribution of gas hydrates on the continental margins of New Zealand (Co-supervised by Dr. Ingo Pecher, GNS Science)

Matt Hill (MSc 2007) - Geophysical and Geomorphological mapping of present and past landscapes, Lake Rotoiti, Nelson Lakes. (Co-supervised by Prof. Gary Wilson.)

Kim Senger (BSc Hons 2006) - Seismic interpretation of the Canterbury slope to identify links between gas hydrate occurrences and slope stability.

Lisa Johnston (MSc 2006) - McMurdo Ice Shelf Seismic Reflection Experiment, Antarctica. (Co-supervised by Dr. Gary Wilson.)

Hamish Blakemore (MSc 2006) - Shallow seismic investigation of the Oreti River aquifer, Southland.

Anna Leslie (MSc 2006) - Seismic characterisation of mineralisation at the Oceana Gold Ltd Gold Mine at Macraes, Otago.

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Publications

Hillman, J. I. T., Lamarche, G., Pallentin, A., Pecher, I. A., Gorman, A. R., & Schneider von Deimling, J. (2017). Validation of automated supervised segmentation of multibeam backscatter data from the Chatham Rise, New Zealand. Marine Geophysical Research. Advance online publication. doi: 10.1007/s11001-016-9297-9

Fraser, D. R. A., Gorman, A. R., Pecher, I. A., Crutchley, G. J., & Henrys, S. A. (2016). Gas hydrate accumulations related to focused fluid flow in the Pegasus Basin, southern Hikurangi Margin, New Zealand. Marine & Petroleum Geology, 77, 399-408. doi: 10.1016/j.marpetgeo.2016.06.025

Barnes, P. M., Ghisetti, F. C., & Gorman, A. R. (2016). New insights into the tectonic inversion of North Canterbury and the regional structural context of the 2010–2011 Canterbury earthquake sequence, New Zealand. Geochemistry, Geophysics, Geosystems, 17, 324-345. doi: 10.1002/2015GC006069

Crutchley, G. J., Fraser, D. R. A., Pecher, I. A., Gorman, A. R., Maslen, G., & Henrys, S. A. (2015). Gas migration into gas hydrate-bearing sediments on the southern Hikurangi margin of New Zealand. Journal of Geophysical Research: Solid Earth, 120(2), 725-743. doi: 10.1002/2014JB011503

Dlabola, E. K., Wilson, G. S., Gorman, A. R., Riesselman, C. R., & Moy, C. M. (2015). A post-glacial relative sea-level curve from Fiordland, New Zealand. Global & Planetary Change, 131, 104-114. doi: 10.1016/j.gloplacha.2015.05.010

Authored Book - Research

Ruckstuhl, K., Carter, L., Easterbrook, L., Gorman, A. R., Rae, H., Ruru, J., Ruwhiu, D., Stephenson, J., Suszko, A., Thompson-Fawcett, M., & Turner, R. (2013). Māori and mining. Dunedin, New Zealand: University of Otago, 59p.

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Chapter in Book - Research

Fohrmann, M., Gorman, A. R., & Pecher, I. A. (2009). Seismic characterization of the Fiordland gas-hydrate province, New Zealand. In T. Collett, A. Johnson, C. Knapp & R. Boswell (Eds.), Natural gas hydrates: Energy resource potential and associated geologic hazards (AAPG Memoir 89). (pp. 467-480). Tulsa, OK: American Association of Petroleum Geologists. doi: 10.1306/13201117M893355

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Journal - Research Article

Hillman, J. I. T., Lamarche, G., Pallentin, A., Pecher, I. A., Gorman, A. R., & Schneider von Deimling, J. (2017). Validation of automated supervised segmentation of multibeam backscatter data from the Chatham Rise, New Zealand. Marine Geophysical Research. Advance online publication. doi: 10.1007/s11001-016-9297-9

Fraser, D. R. A., Gorman, A. R., Pecher, I. A., Crutchley, G. J., & Henrys, S. A. (2016). Gas hydrate accumulations related to focused fluid flow in the Pegasus Basin, southern Hikurangi Margin, New Zealand. Marine & Petroleum Geology, 77, 399-408. doi: 10.1016/j.marpetgeo.2016.06.025

Barnes, P. M., Ghisetti, F. C., & Gorman, A. R. (2016). New insights into the tectonic inversion of North Canterbury and the regional structural context of the 2010–2011 Canterbury earthquake sequence, New Zealand. Geochemistry, Geophysics, Geosystems, 17, 324-345. doi: 10.1002/2015GC006069

Dlabola, E. K., Wilson, G. S., Gorman, A. R., Riesselman, C. R., & Moy, C. M. (2015). A post-glacial relative sea-level curve from Fiordland, New Zealand. Global & Planetary Change, 131, 104-114. doi: 10.1016/j.gloplacha.2015.05.010

Crutchley, G. J., Fraser, D. R. A., Pecher, I. A., Gorman, A. R., Maslen, G., & Henrys, S. A. (2015). Gas migration into gas hydrate-bearing sediments on the southern Hikurangi margin of New Zealand. Journal of Geophysical Research: Solid Earth, 120(2), 725-743. doi: 10.1002/2014JB011503

Hillman, J. I. T., Gorman, A. R., & Pecher, I. A. (2015). Geostatistical analysis of seafloor depressions on the southeast margin of New Zealand’s South Island: Investigating the impact of dynamic near seafloor processes on geomorphology. Marine Geology, 360, 70-83. doi: 10.1016/j.margeo.2014.11.016

Gorman, A. R., Hill, M. G., Orpin, A. R., Koons, P. O., Norris, R. J., Landis, C. A., … Osterberg, E. C. (2013). Quaternary shelf structures SE of the South Island, imaged by high-resolution seismic profiling. New Zealand Journal of Geology & Geophysics, 56(2), 68-82. doi: 10.1080/00288306.2013.772906

Crutchley, G. J., Gorman, A. R., Pecher, I. A., Toulmin, S., & Henrys, S. A. (2011). Geological controls on focused fluid flow through the gas hydrate stability zone on the southern Hikurangi Margin of New Zealand, evidenced from multi-channel seismic data. Marine & Petroleum Geology, 28(10), 1915-1931. doi: 10.1016/j.marpetgeo.2010.12.005

Pysklywec, R. N., Ellis, S. M., & Gorman, A. R. (2010). Three-dimensional mantle lithosphere deformation at collisional plate boundaries: A subduction scissor across the South Island of New Zealand. Earth & Planetary Science Letters, 289(3/4), 334-346. doi: 10.1016/j.epsl.2009.11.022

Campbell, F. M., Kaiser, A., Horstmeyer, H., Green, A. G., Ghisetti, F., Gorman, A. R., … Nobes, D. C. (2010). Processing and preliminary interpretation of noisy high-resolution seismic reflection/refraction data across the active Ostler Fault zone, South Island, New Zealand. Journal of Applied Geophysics, 70(4), 332-342. doi: 10.1016/j.jappgeo.2009.05.001

Campbell, F. M., Ghisetti, F., Kaiser, A. E., Green, A. G., Horstmeyer, H., & Gorman, A. R. (2010). Structure and evolution of the seismically active Ostler Fault Zone (New Zealand) based on interpretations of multiple high resolution seismic reflection profiles. Tectonophysics, 495(3-4), 195-212. doi: 10.1016/j.tecto.2010.09.016

Crutchley, G. J., Pecher, I. A., Gorman, A. R., Henrys, S. A., & Greinert, J. (2010). Seismic imaging of gas conduits beneath seafloor seep sites in a shallow marine gas hydrate province, Hikurangi Margin, New Zealand. Marine Geology, 272, 114-126. doi: 10.1016/j.margeo.2009.03.007

Crutchley, G. J., Geiger, S., Pecher, I. A., Gorman, A. R., Zhu, H., & Henrys, S. A. (2010). The potential influence of shallow gas and gas hydrates on sea floor erosion of Rock Garden, an uplifted ridge offshore of New Zealand. Geo-Marine Letters, 30(3/4), 283-303. doi: 10.1007/s00367-010-0186-y

Gorman, A. R., & Senger, K. (2010). Defining the updip extent of the gas hydrate stability zone on continental margins with low geothermal gradients. Journal of Geophysical Research, 115, B07105. doi: 10.1029/2009jb006680

Pecher, I. A., Henrys, S. A., Wood, W. T., Kukowski, N., Crutchley, G. J., Fohrmann, M., Kilner, J., Senger, K., Gorman, A. R., … Faure, K. (2010). Focussed fluid flow on the Hikurangi Margin, New Zealand: Evidence from possible local upwarping of the base of gas hydrate stability. Marine Geology, 272(1-4), 99-113. doi: 10.1016/j.margeo.2009.10.006

Ghisetti, F. C., Gorman, A. R., Grasso, M., & Vezzani, L. (2009). Imprint of foreland structure on the deformation of a thrust sheet: The Plio-Pleistocene Gela Nappe (southern Sicily, Italy). Tectonics, 28, TC4015. doi: 10.1029/2008tc002385

Johnston, L., Wilson, G. S., Gorman, A. R., Henrys, S. A., Horgan, H., Clark, R., & Naish, T. R. (2008). Cenozoic basin evolution beneath the southern McMurdo Ice Shelf, Antarctica. Global & Planetary Change, 62, 61-76. doi: 10.1016/j.gloplacha.2007.11.004

Hornbach, M. J., Saffer, D. M., Holbrook, W. S., Van Avendonk, H. J. A., & Gorman, A. R. (2008). Three-dimensional seismic imaging of the Blake Ridge methane hydrate province: Evidence for large, concentrated zones of gas hydrate and morphologically driven advection. Journal of Geophysical Research, 113, B07101. doi: 10.1029/2007JB005392

Ghisetti, F. C., Gorman, A. R., & Sibson, R. H. (2007). Surface breakthrough of a basement fault by repeated seismic slip episodes: The Ostler Fault, South Island, New Zealand. Tectonics, 26, TC6004.

Crutchley, G. J., Gorman, A. R., & Fohrmann, M. (2007). Investigation of the role of gas hydrates in continental slope stability west of Fiordland, New Zealand. New Zealand Journal of Geology & Geophysics, 50(4), 357-364. doi: 10.1080/00288300709509842

Gorman, A. R., Németh, B., Clowes, R. M., & Hajnal, Z. (2006). An investigation of upper mantle heterogeneity beneath the Archaean and Proterozoic crust of western Canada from Lithoprobe controlled-source seismic experiments. Tectonophysics, 416, 187-207.

Hornbach, M. J., Holbrook, W. S., Gorman, A. R., Hackwith, K. L., Lizarralde, D., & Pecher, I. (2003). Direct seismic detection of methane hydrate on the Blake Ridge. Geophysics, 68(1), 92-100.

Holbrook, W. S., Gorman, A. R., Hornbach, M., Hackwith, K. L., Nealon, J., Lizarralde, D., & Pecher, I. A. (2002). Seismic detection of marine methane hydrate. Leading Edge, 21(7), 686-689.

Clowes, R. M., Burianyk, M. J., Gorman, A. R., & Kanasewich, E. R. (2002). Crustal velocity structure from SAREX, the Southern Alberta Refraction Experiment. Canadian Journal of Earth Sciences, 39(3), 351-373.

Gorman, A. R., Holbrook, W. S., Hornbach, M. J., Hackwith, K. L., Lizarralde, D., & Pecher, I. A. (2002). Migration of methane gas through the hydrate stability zone in a low-flux hydrate province. Geology, 30(4), 327-330.

Gorman, A. R. (2002). Ray-theoretical seismic traveltime inversion: Modifications for a two dimensional radially parametrized earth. Geophysical Journal International, 151, 511-516.

Holbrook, W. S., Lizarralde, D., Pecher, I. A., Gorman, A. R., Hackwith, K. L., Hornbach, M. J., & Saffer, D. M. (2002). Escape of methane gas through sediment waves in a large methane hydrate province. Geology, 30(5), 467-470.

Gorman, A. R., Clowes, R. M., & et al (2002). Deep probe: Imaging the roots of western North America. Canadian Journal of Earth Sciences, 39(3), 375-398.

Gorman, A. R., & Clowes, R. M. (1999). wave-field tau-p analysis for 2-D velocity models: Application to western North American lithosphere. Geophysical Research Letters, 26(16), 2323-2326.

Gorman, A. R., & et al (1998). Probing the depths of western North America: Contrasting archean and proterozoic lithosphere with controlled source seismology. GSA Today, 8(7), 1-5.

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