Browsing by Subject "Plate tectonics -- Russia -- Remote sensing"
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Item Development of an iterative method of station average receiver function production with application to Russia and the Caribbean region(Texas Tech University, 2004-08) Baptiste, Jenelle KarenReceiver functions are produced by deconvolving the vertical component of a seismogram from the horizontal components thereby isolating the P-to-S (Ps) conversions from layering in the crust and mantle. Traditionally the deconvolution is done by a frequency domain spectral division where the vertical component (in the denominator) is stabilized using a waterlevel analogy to fill holes in the vertical component spectrum before deconvolving from the horizontal component. Band limitations in the spectrum lead to side lobes that can obscure secondary arrivals. Noise is typically reduced using post deconvolution stacking. An iterative deconvolution approach has been developed that uses a cross correlation method to pick Ps converted phase and construct the receiver function phase by phase. This method has been adapted to enable stacking the moveout corrected, correlated horizontal components (with the vertical) and autocorrelated vertical components as an intermediate step prior to picking the Ps phases and production of the receiver function. This takes advantage of the enhancement in signal to noise ratio as an intermediate step of the production of a receiver function thereby removing the amount of noise that are interpreted as Ps conversions. The product of this type of receiver function computation is a station average receiver function that can be interpreted for crust and upper mantle structure. To reduce noise introduced by the vertical component of the seismogram, a process has been devised to automatically chop, taper and mute portions of the vertical component to eliminate post event noise. The iterative method produces a more concise receiver function than the frequency domain waterlevel method because no side lobes are created to obscure Ps conversions. The simultaneous iterative method performs best of the approaches under investigation and this method is overall successful in determining crust and upper mantle structure.