Princeton University

Jeroen Tromp

Jeroen Tromp joined the Department of Geosciences in July 2008 as Blair Professor of Geology and Professor of Applied & Computational Mathematics. He comes from the California Institute of Technology, where he was the Director of the Seismological Laboratory and McMillan Professor of Geophysics. From 1992 to 2000, he was a faculty member of the Department of Earth & Planetary Sciences at Harvard University. His Ph.D. (1992) and M.S. (1990) in Geophysics are from Princeton University, and he received his B.Sc. (1988) in Geophysics from the University of Utrecht in the Netherlands, of which he is a native.

Tromp’s primary research areas are in Theoretical & Computational Seismology. Research topics include: surface waves, free oscillations, body waves, seismic tomography, numerical simulations of 3-D wave propagation, and seismic hazard assessment. In collaboration with the late Princeton Geosciences faculty member Tony Dahlen he published the book Theoretical Global Seismology.

Ebru Bozdag

Ebru joined Jeroen Tromp’s group as a postdoctoral research associate in September 2009. She obtained a Ph.D degree in Seismology from Utrecht University, the Netherlands, under the supervision of Jeannot Trampert, and MSc/BSc degrees in Geophysics from Istanbul Technical University, Turkey. Ebru's research interests lie in computational seismology, more specifically, in focusing on full waveform tomography at global and regional scales. During her PhD, using 3-D numerical wave simulations, she investigated crustal effects in global mantle tomography and worked on defining new misfit functions for full-waveform tomography such as instantaneous phase and envelope measurements. Ebru's current project is dedicated to obtaining a global tomographic model using adjoint techniques by inverting crust and upper-mantle together to avoid any bias introduced in upper-mantle images due to "crustal corrections."

Collaborations: Hejun Zhu, Daniel Peter, Yang Luo, and Jeroen Tromp.

Shravan Hanasoge

Shravan Hanasoge received his doctorate from Stanford University in 2007. He continued on for a brief stint as a postdoctoral scholar, and spent a few months visiting Monash University, Australia and Indian Institute of Astrophysics, Bangalore. He then pursued a joint appointment between Max-Planck Institute for Solar System Research in Germany and the Department of Geosciences, Princeton University.

His primary research area is in helioseismology - specifically using adjoint methods to invert for the structure and dynamics of 3D phenomena such as sunspots, convection etc. He also maintains an active interest in turbulence and convection, numerical methods, and terrestrial seismology.

Collaborations: Aaron Birch (CORA/NWRA), Thomas Duvall, Jr. (NASA/Stanford University), Laurent Gizon (Max-Planck Instiute), Steven Orszag (Yale University), Katepalli Sreenivasan (New York University), and Jeroen Tromp (Princeton University).

Matthieu Lefebvre

Matthieu joined Jeroen Tromp’s group as a postdoctoral research associate in January 2013. He received a Ph.D. in mathematics from University Paris Nord, in France, under the supervision of Pr. Claude Basdevant, while studying how to accelerate computational fluid dynamics algorithms on GPU at ONERA. Matthieu holds a Ms. Sc. in computer sciences from ENSEIRB Bordeaux, France, with a specialization in high performance computing.

His researches focus on how to accelerate science, in particular, numerical simulations on hardware architectures at the cutting edge of technology.

Collaborations: Ebru Bozdag, Wenjie Lei, Herurisa Rusmanugroho,  James Smith, and Jeroen Tromp.

Hom Nath Gharti

Hom N. Gharti joined Jeroen Tromp's group as a postdoctoral research associate starting in January 2012. Gharti received a Ph.D. in geophysics from the University of Oslo and NORSAR, Norway, and a M.Sc. in earthquake engineering from University of Tokyo, Japan. Gharti holds a B.E. degree in civil engineering from Tribhuvan University, Nepal. His primary research interests include computational (geo)mechanics including glacial rebound, wave propagation, inverse problems, and microseismicity.

Collaborations: Daniel Peter, Ebru Bozdag, Hejun Zhu, Yang Luo, and Jeroen Tromp.

Herurisa Rusmanugroho

Heru joined Jeroen Tromp’s group as a postdoctoral research associate in January 2013. He received his Ph.D. (2011) in Geosciences from the University of Texas at Dallas. He received his M.Sc. (2005) and B.Sc. (2003) in Geophysics from Institute of Technology Bandung, Indonesia.

His primary research area is in Exploration Seismology including wave propagation, imaging, and inverse problems. During his Ph.D., he researched anisotropic 3D, 9-C seismic modeling and inversion, under the supervision of George McMechan.

Collaborations: Matthieu Lefebvre, Ryan Modrak, and Jeroen Tromp.

Wenjie Lei

Wenjie Lei is a graduate student at the Department of Geosciences, Princeton University. He joined Prof. Jeroen Tromp's group in 2012. Wenjie has studied at the University of Science and Technology of China from 2008, and obtained his B.S. degree in Geophysics in 2012. His primary research interests include global seismology, tomography, and seismic wavefield simulation.

Collaborations: Jeroen Tromp, Ebru Bozdag, James Smith, Hejun Zhu.

Ryan Modrak

Ryan Modrak has been a graduate student in Jeroen Tromp’s group since Fall 2010.  Prior to joining Princeton, he received B.Sc. degrees from Penn State University in math and geosciences and worked at Los Alamos Laboratory.   His research interests include optimization and data inversion applied to both seismology and exploration geophysics. He is currently working in seismic interferometry / noise tomography and has worked in the past on joint inversion and event location problems.

Collaborations: Jeroen Tromp, Yang Luo (Tromp group), Hejun Zhu (Tromp group), Daniel Peter (Tromp group), Monica Maceira (Los Alamos), and Stephen Arrowsmith (Los Alamos).

James Smith

James Smith is a graduate student in the Department of Geosciences. He joined Jeroen Tromp's group in August 2012. James received a B.S. in geosciences from Colorado State University and a B.A. in mathematics from Knox College. His research interests are in seismic imaging and inverse problems. He is currently working with Ebru Bozdag and Jeroen Tromp on the global tomographic model.

Collaborations: Jeroen Tromp, Ebru Bozdag, Wenjie Lei, Derek Schutt (CSU)

Hejun Zhu

Hejun Zhu is a Ph.D. candidate in Geophysics at the Department of Geosciences. He has a M.A. in geophysics from Princeton, a M.S. in geophysics from Peking University, Beijing, China, and a B.S. in geosciences from Sun-Yat-Sen University, Guangzhou, China. Since 2008, Hejun's research interests include imaging and tomography, seismic wavefield and dynamic rupture simulations at Princeton. Hejun was a research assistant at the Department of Geophysics, at Peking University, China, from 2005 to 2008. At that time, his studies included seismic wavefield simulation and dynamic rupture by using finite difference method.

Collaborations: Jeroen Tromp, Christina Morency, Daniel Peter, Ebru Bozdag, Yang Luo, Shravan Hanasoge, and Ryan Modrak. Before coming to Princeton University, Hejun worked with Prof. Xiaofei Chen at Peking University.

Rafael Abreu

Visiting Student Research Collaborator
Rafael Abrew is a VSRC (visiting student research collaborator) in the Geosciences Department, Princeton University. Abreu is currently a graduate student in the Andalusian Institute of Geophysics at the University of Granada, Spain. He holds a B.S. degree in petroleum engineering and M.Sc. degree in stochastic models from the Central University of Venezuela. He also holds a M.Sc. degree in geophysics and meteorology from the University of Granada. Before joining the Andalusian Institute of Geophysics in Spain, he worked at FUNVISIS (Venezuelan Foundation for Seismological Research) for two years on seismic microzoning projects, including numerical modeling and field works.

Abreu's current research focuses on numerical simulation of seismic wave propagation, using spectral elements, finite differences and complex variable methods, source inversions and rotational seismology.

Collaborations: Daniel Stich (University of Granada), Michael Schmitz (FUNVISIS), Luis Dalguer (ETH), Stephan Nielsen (INGV), Apostolos Papageorgiou (University of Patras) and Jeroen Tromp (Princeton University).

Huub Douma

Visitor Researcher
Huub has been a visiting researcher in the Princeton seismology group since summer 2010. He is currently employed by ION Geophysical as a senior research geophysicist. In this role he is actively seeking collaborations with the global seismology community at universities, since global seismology and exploration seismology seem to be converging at an ever increasing rate; due to the advance of array-based acquisition methodology in global seismology and passive seismic monitoring in exploration seismology, both fields are currently overlapping more than ever. Huub's visit to Princeton University is an example of the fact that converging research fields can benefit from converging communities.

Huub obtained his M.Sc. in geophysics from Utrecht University in 1996, and subsequently, worked from 1997-2001 as a field seismic analyst, data processing analyst, staff geophysicist, and research geophysicist for Western Geophysical from 1997-2001. He obtained his Ph.D. in geophysics from the Center for Wave Phenomena (CWP) at Colorado School of Mines under the guidance of Roel Snieder. Subsequently he was a Hess postdoctoral research fellow at Princeton University where he collaborated with the late Tony Dahlen, Guust Nolet, and Ingrid Daubechies. His research interests span a wide range of topics. Currently, he is mostly working on surface wave inversion, seismic interferometry and reciprocity theorems, adjoint tomography, and passive seismic monitoring.

Collaborations: Jeroen Tromp (Princeton University), Matthew Haney (Alaska Volcano Observatory), Kees, Wapenaar (Delft University of Technology), and Roel Snieder (Center for Wave Phenomena/Colorado School of Mines).

Former Postdoctoral Scholars:
Richard Allen, Berkeley
Juliette Artru, CNES
Emanuele Casarotti, INGV, Rome
Dimitri Komatitsch, CNRS, Marseille
Swaminathan Krishnan, Caltech
Carene Larmat, LANL
Konstantin Latychev (with Prof. Jerry Mitrovica), Toronto University
Hong Ma (with Prof. Adam Dziewonski), Bank Boston
Alessia Maggi, University of Strasbourg
Christina Morency, LLNL
Tarje Nissen-Meyer, ETH, Zürich
Daniel Peter, ETH, Zürich
Anne Sieminski (with Prof. Jeannot Trampert), University of Grenoble
Christiane Stidham (with Prof. John Shaw), SUNY
Peter Süss (with Prof. John Shaw), unknown
Mark Tamisiea (with Prof. Jerry Mitrovica), Proudman Oceanographic Laboratory
Cédric Vonesch, University of Lausanne
Zheng Wang, unknown
Ying Zhou, Virginia Tech

Former Graduate Students:
Min Chen, Rice University
Vala Hjórleifsdóttir, UNAM, Mexico
Miaki Ishii (with Prof. Adam Dziewonski), Harvard
YoungHee Kim (with Prof. Rob Clayton), Seoul University
Qinya Liu, University of Toronto
Yang Luo, Chevron
Carl Tape, University of Alaska, Fairbanks;

Former Visitors and Friends:
Karolin F. Elcomert, Istanbul Technical University
Irene Molinari, University of Bologna
Federica Magnoni, University of Bologna
Matthias A. Meschede, LMU München