We make inferences about the physical properties of heterogeneous media from scattered (elastic) waves. Indoors, these waves are mostly ultrasonic, excited and detected with lasers. Outside, probing waves are in the seismic frequency band.

Apple Seismology; for more info visit the publications page.

As our wavelengths span orders of magnitudes, so do our applications. Outside, targets include the Auckland Volcanic Field, geothermal exploration, and micro-seismicity for fluid reservoir characterization. In the laboratory, we do rock physics in collaboration with the PORO lab, ice physics, medical imaging.

News

  • Alpine Fault rocks going non-linear
    A new publication led by Jonathan Simpson appeared in Geophysical Research Letters, this month.¬† Laser ultrasonic measurements show that the wave speed in Alpine Fault rocks decreases for waves with a larger amplitude, as shown below. The closer to the fault, the more the wave speed decreases with amplitude. The observation of "rock weakening" contributes…
  • Jonathan Simpson wins student award at the AGU meeting
    In December 2020, the AGU meeting was held virtually, and Jonathan won a best student presentation in the seismology section of the meeting with a presentation that blended a traditional "zoom-style" presentation with a tour of the setup of his laser-ultrasound experiments on nonlinear rock properties under in situ conditions. These nonlinear rock properties may…
  • Jonathan and Caitlin officially graduated
    We would like to congratulate Caitlin Smith and Jonathan Simpson with their brand-new BSc (science scholar) and MSc degree, respectively. It has been such a pleasure to work with them in our lab, that we are very happy¬† they both will continue research in the Physical Acoustics Lab in pursuit of a BSc Honours (Caitlin)…

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