Phone: +31 (0)30 253 5086
Fax: +31 (0)30 253 2648

Jeannot Trampert

Research Interests
* Seismic tomography (error assessment and thermo-chemical interpretation) with special focus on anisotropy and density
* Full waveform inversion and inverse theory in general
* (Numerical) wave propagation in complex media
* Advanced processing of land seismic data

website: http://www.geo.uu.nl/~jeannot
e-mail: trampert@geo.uu.nl
phone: +31 (0)30 253 5088

Hanneke Paulssen

My primary research interest is observational seismology, and much of my research is based on waveform information using regional seismic networks such as the NARS network of Utrecht University. Most of my research in the past were body wave studies of the mantle and core, as well as crustal anisotropy, but in recent years I changed focus a bit to surface wave studies of the mantle. Recent work is devoted to the Gulf of California using data of the NARS network.

e-mail: paulssen@geo.uu.nl
phone: +31 (0)30 253 5089

Arie van Wettum

My main responsibility is the deployment of our seismological equipment in the different (NARS) projects. It involves the design and upgrade of the necessary hard and software as well as the field installation, maintenance and data processing. Programming skills are C, Assembly, Fortran, HTML and Basic, used at different platforms. Main interests are system developments to reduce space, energy and cost while reliability and quality increase.

e-mail: wettum@geo.uu.nl
phone: +31 (0)30 253 5159

Jacqueline Landsheer

e-mail: landsh@geo.uu.nl
phone: +31 (0)30 253 5086

Andreas Fichtner

My research is centered around the development and the application of numerical wave propagation methods to seismic tomography. Specifically I am working on a full waveform inversion of the European upper mantle, probabilitic waveform tomography and the sampling problem in high-dimensional model spaces.

website: http://www.geo.uu.nl/~fichtner
e-mail: fichtner@geo.uu.nl
phone: +31 (0)30 253 5948

Paul Käufl

My research interest lies in the application of probabilistic techniques such as Monte Carlo methods and artificial neural networks to tomographic inverse problems. The goal of my project is the generation of global wave speed and density models in the upper and lower mantle and the estimation of earthquake source locations and moment tensors by inverting full seismograms in a fully non-linear way. The resulting global seismic models may then be used to find constraints on thermo-chemical variations in the Earth's mantle

e-mail: kaeufl@geo.uu.nl
phone: +31 (0)30 253 5135

Florian Rickers

The role of mantle plumes in mantle convection and tectonics is still unclear, mainly because concluding direct evidence for their existence and about their possible source region is missing. The validity of seismological approaches taken to date has been discussed controversially and results are not generally agreed on. The aim of my PhD project is to improve tomographic techniques with a focus on the possibility to properly account for effects caused by the finite frequency nature of seismic waves. These effects, especially scattering, diffraction and the resulting wave front healing, enable mantle plumes to hide from the 'tomographic eye' until now. I am using a highly accurate full 3D wave propagation code and adjoint methods to first develop the necessary theoretical techniques and later apply them to seismic data for regions like Iceland and Yellowstone, hopefully resulting in new information about the nature of mantle plumes.

e-mail: rickers@geo.uu.nl
phone: +31 (0)30 253 5087

Andrew Valentine

My research is centred on global tomography: how can we improve images of the Earth's interior? In order to do so, we must understand how the various choices made in setting up an inversion affect the final model; we must also develop tools to allow us to take full advantage of the wide range of seismic data now available. Can the process of data selection and quality control be automated, enabling inversion of larger datasets? Are we extracting all useful information from each seismogram? Other research interests include the problem of seismic source determination, and the integration of seismic and geodetic datasets.

I am supported by the QUEST project, www.quest-itn.org

website: http://www.geo.uu.nl/~andrew
e-mail: valentine@geo.uu.nl
phone: +31 (0)30 253 5192

Denise de Vos

The aim of my research is to improve our knowledge of the tectonic evolution of the Gulf of California. Using surface wave data from the NARS-Baja project, 3-D imaging of this region (Zhang, 2009) has shown large differences in mantle structure between the northern and the southern parts of the gulf. In this study, noise data from both NARS stations and ocean bottom seismographs in the southern part of the gulf (SCOOBA experiment) will be used, in order to more accurately determine the crustal and mantle shear velocity structure with anisotropy. Hopefully, this will give more insight in the formation and evolution of the gulf

e-mail: denise@geo.uu.nl
phone: +31 (0)30 253 5138

Ralph de Wit

The aim of my project is to construct global tomographic models of wave speeds and density in the Earth's mantle and convert these seismic models to models of thermo-chemical variations in the Earth's mantle. Accurate knowledge of thermo-chemical variations inside the Earth is crucial in our quest to obtain a solid understanding of mantle dynamics and the thermo-chemical evolution of the Earth. To do so, we want to invert for complete seismograms in a fully non-linear way by using neural networks. Artificial neural networks can be used to represent non-linear mappings and are therefore potentially very suitable for the particular application of seismic waveform tomography.

e-mail: rdewit@geo.uu.nl
phone: +31 (0)30 253 5135

Tedi Yudistira

The goal of my current research is to produce an integrated seismic-speed image of the deep structure of The Netherlands using data from a new temporary seismic network. I will use surface wave tomography (by using earthquake and also noise as data) and receiver functions, where the results from one method will constrain the other, so I will use a joint inversion of surface waves and receiver functions. The new seismic-speed model together with existing shallow models will improve our understanding to the geological processes of The Netherlands.

e-mail:tedi@geo.uu.nl
phone: +31 (0)30 253 5138

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