• 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)…