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.


  • TCAS seismic inversion
    In this post we have shown that the adaptive stacking tcas can reflect pickings done manually. Here we would like to present the result of teleseismic inversion using the tcas output from the same set of events.     Misfit and chi^2 shows a trend decreasing with iterations. With chi^s goes…
  • Manual picks and TCAS: Comparison of residuals of three events with the same epicentre
    We would like to compare the result we obtained in this post to the same set of events but by using the adaptive stacking TCAS approach.     We plot the raw data, initial alignment by removing the predicted arrival travel-time, and the final alignment after the cross-correlation. We allow the…
  • Comparing residuals for three events with the same epicentre
    events We have three events in the Celebes Sea south of Philippine that have virtually the same epicenter. So presumably these would yield equal or at least similar paths to our stations.     In details, events locations are:       The ray-paths are projected to be indeed of uniform…

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