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dc.rights.licenseCC-BY-NC-ND
dc.contributor.advisorTrampert, Prof. Dr. J.A.
dc.contributor.advisorDeuss, Dr. A.F.
dc.contributor.authorGregorian, P.
dc.date.accessioned2018-07-19T17:03:46Z
dc.date.available2018-07-19T17:03:46Z
dc.identifier.urihttps://studenttheses.uu.nl/handle/20.500.12932/29492
dc.description.abstractRealistic laterally heterogeneous Earth models can be obtained by comparing synthetics to measured seismograms and by minimizing their misfit through iteratively optimizing the model parameters until a satisfactory match between synthetics and data is obtained. The derivative of the misfit with respect to the Earth model parameters can be obtained by a simultaneous calculation of a synthetic seismogram for the model and an `adjoint' wavefield originating from a fictitious source at the receiver position of the time-reversed misfit. The adjoint wavefield is given by a convolution of the misfit with the Green's function. This study provides Green's functions and synthetic seismograms for the Preliminary Reference Earth Model (PREM) using normal mode summation. The synthetics of a point source are calculated using eigenfunctions and eigenfrequencies for PREM provided by the software package \texttt{MINEOS}. The point source includes force terms which allows the calculation of Green's functions, a functionality absent in \texttt{MINEOS}. Synthetics and Green's functions for PREM could be used in the future to perform the first iteration in the optimization procedure of finding a realistic heterogeneous Earth model. To effectively solve the inverse problem of finding a realistic laterally heterogeneous Earth model, more iterations of the optimization procedure are needed, for which synthetic seismograms and Green's functions for laterally heterogeneous Earth models will be required.
dc.description.sponsorshipUtrecht University
dc.format.extent1550806
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.titleSynthetics and Green's functions for PREM in the Generalized Spherical Harmonic expansion
dc.type.contentMaster Thesis
dc.rights.accessrightsOpen Access
dc.subject.keywordssynthetic seismograms, PREM, normal modes, Green's functions, adjoint
dc.subject.courseuuGeophysics


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