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Joint Inversion of Receiver Function, Rayleigh Wave Ellipticity and Apparent Incidence Angle Data for Crustal Structures
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 77th EAGE Conference and Exhibition 2015, Jun 2015, Volume 2015, p.1 - 5
Abstract
We present a joint inversion approach that combines three independent single-station methods for the inversion of a 1D P- and S-wave crustal model for a specific location. We combine P-Receiver functions, the frequency dependent polarization of Rayleigh waves and the apparent P-wave incidence angle, resulting in an inversion process, which is less susceptible to problems related with non-uniqueness of the inversion compared to pure receiver function studies. We developed a stepwise approach of inversion that minimizes the weighted sum of the individual misfits (least squares method). First, we inverted teleseismic data using a gradient method with finite differences for the Moho depth and crustal velocities. We tested and validated the approach with synthetically computed data of a one-layer over a half-space model. In a second step we processed local and regional events to perform a grid search for the thickness and S-wave velocity of a sediment layer. We applied the presented method to three different stations in Europe (Moxa and GRA1 in Germany, and Suwalki in Poland). All our results are highly comparable to local studies at these stations. Combining the different methods our approach helps to constrain the crustal structure more precisely.