Hejun Zhu is a structural and computational seismologist and an Assistant Professor of Geosciences. His research has two foci:
- Large scale Earth structure, including crust, upper mantle and lower mantle.
- Reservoir scale imaging and inversion, which involves development of high resolution imaging and inversion techniques.
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Crustal Wave Speed Structure of North Texas and Oklahoma Based on Ambient Noise Cross-Correlation Functions and Adjoint Tomography Recently, seismologists observed increasing seismicity in NorthTexas and Oklahoma. Based on seismic observations and other geophysical measurements, numerous studies have suggested links between the increasing seismicity ...
Seismogram Registration via Markov Chain Monte Carlo Optimization and Its Applications in Full Waveform Inversion (Oxford Univ Press, 2018-11-05)Cycle skipping is a serious issue in full waveform inversion (FWI) since it leads to local minima. To date, most FWI algorithms depend on local gradient based optimization approaches, which cannot guarantee convergence ...
(Oxford Univ Press, 2017-07-31)We use seismic data from USArray to image the upper mantle underneath the United States based on a so-called 'adjoint tomography', an iterative full waveform inversion technique. The inversion uses data from 180 regional ...
(Society of Exploration Geophysicists, 2017-06-21)Because of inaccurate, incomplete, and inconsistent waveform records, full-waveform inversion (FWI) in the framework of a local optimization approach may not have a unique solution, and thus it remains an ill-posed inverse ...