Date of Award
Open Access Master's Thesis
Master of Science in Geology (MS)
Administrative Home Department
Department of Geological and Mining Engineering and Sciences
Gregory P. Waite
Committee Member 1
Committee Member 2
Simon A. Carn
The application of ambient noise analysis to active volcanic systems represents a recent technique to model seismic structure without distinct sources. All the existing methods are based on the fact that surface waves are dispersive and most of them require a large number of available days and inter-station distances larger than 2-3 wavelengths. We apply multiple techniques to seismic data recorded during a temporary deployment of 19 seismic stations in January 2015 at Pacaya volcano, Guatemala, a dataset with some distinct differences from those typically used for ambient noise analysis. Despite having less than a week of data and relatively close inter-station spacing, we find a good agreement between the approaches. In particular, we find that the SPAC method (Aki, 1957) is applicable not only for a seismic array, but also for single pairs of stations. It may be particularly favorable in those conditions characterized by small set of data and small inter-station distances. We also noted linear relationship between phase velocity and inter-station distance might suggest a contribution of body/scattered waves within the surface waves and it is probably due to the seismic station configuration in proximity of the Pacaya vent.
Puel, Simone, "COMPARISON OF AMBIENT NOISE METHODS TO FIND SURFACE - WAVE DISPERSION CURVES AT PACAYA VOLCANO, GUATEMALA", Open Access Master's Thesis, Michigan Technological University, 2017.