dc.rights.license | CC-BY-NC-ND | |
dc.contributor.advisor | Trampert, Prof. Dr. J.A. | |
dc.contributor.advisor | Deuss, Dr. A.F. | |
dc.contributor.author | Gregorian, P. | |
dc.date.accessioned | 2018-07-19T17:03:46Z | |
dc.date.available | 2018-07-19T17:03:46Z | |
dc.identifier.uri | https://studenttheses.uu.nl/handle/20.500.12932/29492 | |
dc.description.abstract | Realistic 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.sponsorship | Utrecht University | |
dc.format.extent | 1550806 | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en | |
dc.title | Synthetics and Green's functions for PREM in the Generalized Spherical Harmonic expansion | |
dc.type.content | Master Thesis | |
dc.rights.accessrights | Open Access | |
dc.subject.keywords | synthetic seismograms, PREM, normal modes, Green's functions, adjoint | |
dc.subject.courseuu | Geophysics | |