Zhu, Hejun
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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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Recent Submissions
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Time-Domain Least-Squares Migration Using the Gaussian Beam Summation Method
With a finite recording aperture, a limited source spectrum and unbalanced illumination, traditional imaging methods are insufficient to generate satisfactory depth profiles with high resolution and high amplitude fidelity. ... -
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 ... -
Radial Anisotropy of the North American Upper Mantle Based on Adjoint Tomography with Usarray
(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 ... -
Full-Waveform Inversion Using Seislet Regularization
(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 ...
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