TITLE:
Crustal Thickness of Funafuti Using Receiver Function Analysis
AUTHORS:
V. Srivardhan
KEYWORDS:
Receiver Function Analysis; Funafuti; Mohorovicic Discontinuity; Deconvolution of Three Component Seismogram; Iterative Time Domain Deconvolution
JOURNAL NAME:
International Journal of Geosciences,
Vol.4 No.10,
December
25,
2013
ABSTRACT:
In this study, the characterization of the depth of the Mohorovicic discontinuity under the crust of Funafuti island was determined by analyzing the 3 component seismograms from 54 different earthquake events recorded by the station between 2008 and 2012. These seismograms were from teleseismic earthquakes whose epicenter lay at distances greater than 3000 km from the station. The seismograms were iteratively deconvolved in the time domain to remove the unwanted noise and then stacked to obtain better receiver functions. For analysis of the receiver functions, it was assumed that the range in which the Vp/Vs ratio would lie for the given region would be between 1.60 - 1.85 and the depth of the discontinuity was assumed to lie between 5 - 20 km. Analysis of the receiver functions showed that the Mohorovicic discontinuity was at a depth of 11 km and the Vp/Vs ratio was 1.75 for the region.