The final project of my PhD was the development of a minimalist infrasonic signal detection and characterization technique requiring just one microphone and one three-component seismometer. This technique could be advantageous in situations where resources are limited. The development of this signal detection and characterization technique for ground-coupled airwaves using a nearly collocated seismometer and microphone was feasible because of groundwork laid out in Ichihara et al. [2012] and Matoza and Fee [2014]. This work was a poster presentation at the AGU Fall Meeting 2016 (Poster) and was presented at the IAVCEI 2017 Scientific Assembly in August. Details of this method are published in the Journal of Geophysical Research [McKee et al., 2018].
Phase search and rose diagram result to estimate backazimuth for an explosion from Cleveland volcano, USA. (a) Image of histogram values from each time shift. (b) Rose diagram of the two possible back azimuths and the number of phase values near 90° for each time shift. (c) The arrangement of the seismometer (orange) and infrasound microphone (green); the solid arrow shows the actual azimuth to the source, while the dashed and dotted lines show the back azimuths from the phase search (also shown in (b)) and the back azimuth from the particle motion analysis, respectively. The gray circles show the other infrasound array element locations. Note that one of the two back azimuth results in (b) is consistent with the actual back azimuth in (c). (Figure 9 from McKee et al., 2018)