Dr David Dempsey

PhD, MSc, BSc (Hons)

Biography

David joined the Engineering Science Department in 2015. Prior to that, he worked on renewable energy and natural hazard problems at Los Alamos National Laboratory and Stanford University. David completed his PhD at the University of Auckland in 2012, studying the relationship between faults and geothermal systems in the central North Island.

 

Research | Current

My research passion is computational geoscience. In particular, I like to use computer models to address practical challenges in renewable energy and natural hazards.

  • What do human-triggered earthquakes and subtle electromagnetic signals tell us about conditions several kilometres below ground?
  • How do interaction between geothermal systems and deep, underground magma bodies a control volcanic eruption or the formation of a gold deposit?
  • What are computer models able (and unable!) to tell us about the nature and likelihood of future earthquakes?

To address these questions, my research group designs models of the fundamental physics of Earth systems, written in thousands of lines of computer code (preferably Python!) We use all sorts of data to calibrate these models, and a range of mathematical techniques to understand the uncertainty in their predictions.

Teaching | Current

I like to use Jupyter Notebooks in teaching my courses (see my library of Azure notebooks to the right).

ENGSCI 233: Computational Techniques and Computer Systems

Computational treatment of data, combinatorial algorithms, error, integration and interpolation, numerical solutions to ODEs, algorithm parallelisation and performance.

ENGSCI 263: Engineering Science Design I

Introduction to concepts of modelling of engineering problems, including model formulation, dimensional analysis, solution procedures, comparisons with reality, and shortcomings, with examples from elementary mechanics, structures, hydrostatics, one-dimensional heat, diffusion and fluid motion. 

ENGSCI 740/741: Waves and Fracture

Fracture mechanics, applied to earthquakes and hydraulic fractures.

Postgraduate supervision

PhD

Jeremy Riffault - "A mixed stochastic/deterministic model for induced seismicity applied to the 2011 Paralana EGS stimulation"

Irene Wallis - "Conceptual Models of Permeability in High-Temperature, volcanic hosted geothermal systems: An Interdisciplinary Approach to Facing Data and Uncertainty"

Alberto Ardid - "Joint inversion of temperatures in a geothermal field using MT, clay alteration models, and geothermal reservoir simulation"

Alexander Catalinac - "Human-triggered earthquakes: a hybrid laboratory-computational study"

 

Areas of expertise

Earthquake modelling; reservoir geomechanics; subsurface fluid modelling; induced seismicity; geothermal reservoir modelling; CO2 sequestration; geological heterogeneity.

Selected publications and creative works (Research Outputs)

  • Dempsey, D., & Suckale, J. (2017). Physics-based forecasting of induced seismicity at Groningen gas field, the Netherlands. Geophysical Research Letters, 44 (15), 7773-7782. 10.1002/2017GL073878
  • Dempsey, D., & Suckale, J. (2016). Collective properties of injection-induced earthquake sequences: 1. Model description and directivity bias. Journal of Geophysical Research: Solid Earth, 121 (5), 3609-3637. 10.1002/2015JB012550
  • Dempsey, D., Suckale, J., & Huang, Y. (2016). Collective properties of injection-induced earthquake sequences: 2. Spatiotemporal evolution and magnitude frequency distributions. Journal of Geophysical Research: Solid Earth, 121 (5), 3638-3665. 10.1002/2015JB012551
  • Birdsell, D. T., Rajaram, H., Dempsey, D., & Viswanathan, H. S. (2015). Hydraulic fracturing fluid migration in the subsurface: A review and expanded modeling results. Water Resources Research, 51 (9), 7159-7188. 10.1002/2015WR017810
  • Dempsey, D., Kelkar, S., Davatzes, N., Hickman, S., & Moos, D. (2015). Numerical modeling of injection, stress and permeability enhancement during shear stimulation at the Desert Peak Enhanced Geothermal System. International Journal of Rock Mechanics and Mining Sciences, 78, 190-206. 10.1016/j.ijrmms.2015.06.003
  • Dempsey, D., O'Malley D, & Pawar, R. (2015). Reducing uncertainty associated with CO2 injection and brine production in heterogeneous formations. International Journal of Greenhouse Gas Control, 37, 24-37. 10.1016/j.ijggc.2015.03.004
  • Dempsey, D., Kelkar, S., & Pawar, R. (2014). Passive injection: A strategy for mitigating reservoir pressurization, induced seismicity and brine migration in geologic CO₂ storage. International Journal of Greenhouse Gas Control, 28, 96-113. 10.1016/j.ijggc.2014.06.002
  • Keating, E., Newell, D., Dempsey, D., & Pawar, R. (2014). Insights into interconnections between the shallow and deep systems from a natural CO₂ reservoir near Springerville, Arizona. International Journal of Greenhouse Gas Control, 25, 162-172. 10.1016/j.ijggc.2014.03.009

Identifiers

Contact details

Primary office location

UNISERVICES HOUSE - Bldg 439
70 SYMONDS ST
AUCKLAND 1010
New Zealand

Social links

Web links