I am currently a PhD student in the Physical Acoustics Lab. My research involves investigating the nonlinear elastic properties of rocks using laser ultrasonics under in situ conditions. I have been a PAL member since 2015, working on a range of topics from seismology in New Zealand to characterisation of timber and fruit with laser ultrasonics. For my MSc project (completed early 2019), I developed and implemented a world-first system to perform laser ultrasonic measurements on rock samples under in situ pressure and temperature conditions.

Publications

JOURNAL ARTICLES

Simpson, J., vanWijk, K., & Adam, L. (2021). Spatial dependence of dynamic nonlinear rock weakening at the Alpine Fault, New Zealand. Geophysical Research Letters, 48, e2021GL093862. https://doi.org/10.1029/2021GL093862

Charoensawan, J., Adam, L., Ofman, M., Toy, V., Simpson, J., Zhong, X., & Schuck, B. (2021). Fracture Shape and Orientation Contributions to P-Wave Velocity and Anisotropy of Alpine Fault Mylonites. Frontiers in Earth Science, 9, 238. https://doi.org/10.3389/feart.2021.645532

Simpson, J., Adam, L., van Wijk, K., & Charoensawan, J. (2020). Constraining microfractures in foliated Alpine Fault rocks with laser ultrasonics. Geophysical Research Letters, 47(8), 1–9. https://doi.org/10.1029/2020GL087378

Simpson, J., van Wijk, K., Adam, L., & Smith, C. (2019). Laser ultrasonic measurements to estimate the elastic properties of rock samples under in situ conditions. Review of Scientific Instruments, 90(11), 114503. https://doi.org/10.1063/1.5120078

van Wijk, K., Simpson, J., & Hitchman, S. (2019). A modified Hankinson Equation for the wave speed of laser ultrasound in Radiata Pine. Wave Motion, 89, 57–64. https://doi.org/10.1016/J.WAVEMOTI.2019.03.005

van Wijk, K., Simpson, J., & Adam, L. (2017). Teaching hands-on geophysics: Examples from the Rū seismic network in New Zealand. European Journal of Physics, 38(2). https://doi.org/10.1088/1361-6404/aa5395

THESES

Simpson, J. (2019). Non-contact measurements to estimate the elastic properties of rocks under in situ conditions (MSc thesis, University of Auckland).

Simpson, J. (2017). Exploring leaky modes in the subducted Pacific Plate (BSc Honours dissertation, University of Auckland).

LINKS

Please see my Google Scholar profile for a complete list of publications.

ResearchGate Profile

ORCID

Contact:   jsim921@aucklanduni.ac.nz