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Tarje Nissen-Meyer
Post Doctoral Scholar in Geophysics
Ph.D., 2007, Geophysics,
Princeton University

California Institute of Technology - Seismo Lab
1200 E. California Blvd., MS 252-21
So. Mudd Builidng, Rm. 370
Pasadena, CA, USA  91125
Phone: Phone: (626) 395-8906
tarje@gps.caltech.edu


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Research

I am a postdoc in Jeroen Tromp's group and interested in seismic-wave propagation and inversion techniques at local to global scales.

I have developed a dedicated spectral-element method to propagate seismic waves through spherically symmetric Earth models. Exploiting symmetries in the radiation patterns for moment-tensor earthquake sources, the resultant 2-D computational domain allows for efficient storage of entire wavefields at the scale of the Earth. These spatio-temporal fields constitute the basis of "exact", arbitrary-resolution (e.g., 1 HZ signals) 3-D Frechet sensitivity kernels for any fraction of broadband seismogram. Large-scale tomogrpahic inversions based on e.g. core-diffracted waves are a natural application of this idea and work-in- progress.

Other topics of interest include spectral-element dispersion analysis, high-order time extrapolation schemes (e.g., symplectic), and 3-D elastic wave propagation through subduction zones and highly heterogeneous crustal scales. Ultimately, I am always partial to careful interpretation of seismic images in terms of mineralogical and geodynamic implications.