John Townend

Learn More
[1] Measurement of basement seismic resonance frequencies can elucidate shallow velocity structure, an important factor in earthquake hazard estimation. Ambient noise cross correlation, which is well-suited to studying shallow earth structure, is commonly used to analyze fundamental-mode Rayleigh waves and, increasingly, Love waves. Here we show via(More)
This paper presents the first continental-scale study of the crust and upper mantle shear-23 velocity (V s) structure of Canada and adjacent regions using ambient noise tomography. Continuous 24 waveform data recorded between 2003 and 2009 with 788 broadband seismograph stations in Canada 25 and adjacent regions are used in the analysis. The higher primary(More)
The Alpine Fault, New Zealand, is a major plate-bounding fault that accommodates 65–75% of the total relative motion between the Australian and Pacific plates. Here we present data on the hydrothermal frictional properties of Alpine Fault rocks that surround the principal slip zones (PSZ) of the Alpine Fault and those comprising the PSZ itself. The samples(More)
  • 1