Our group is dedicated to improving the physical imaging of subsurface geology structure and its physical properties using quantitative geophysical methods (seismic and ground-penetrating radar). We integrate geophysical techniques, mathematical simulation, and field measurements have looked at a wide range of subsurface imaging challenges from fractures to faults, CO2 sequestration, intrinsic and scattering attenuation, and microseismicity. Additionally, we have worked on a number of interdisciplinary projects, including detecting short/long-term environmental changes and hazards using fiber seismic sensors, imaging bedrock in shale hills critical zone sites, and imaging shear-wave properties in urban areas.

Ph.D. opportunities: Exciting graduate assistantship opportunities are available studying the critical zone (e.g., bedrock imaging, fractures, groundwater flow path) using advanced full waveform inversion of near-surface seismic datasets by distributed acoustic sensing sensors or geophones. 

Group news

  • DEC 2019. We will have six talks in the coming AGU Fall Meeting:
  1. Chao Huang: Seismic full waveform inversion procedure for characterizing critical zone subsurface structure: a case study at the Susquehanna Shale Hills Critical Zone Observatory
  2. Junzhu Shen: Noise Characterization of Distributed Acoustic Sensing Monitoring Data in Urban Areas: Preliminary Results
  3. Zi Xian Leong: Multi-scale Deep Learning Seismic Full Waveform Inversion
  4. Guangchi Xing: Finite-frequency Fréchet Kernels for Adjoint Tomography of Frequency-independent Q
  5. Chao Guo: Crack dynamics revealed by time-lapse acoustic attenuation and velocity: insights from active acoustic emission experiments
  6. Tieyuan Zhu: Detecting and tracking thunderstorm-quakes by fiber-optic distributed acoustic sensing array data
  • Nov 2019. The paper on fiber-optic thunderquakes was accepted by JGR-Atmospheres. This paper for the 1st time reports a finding of using a fiber-optic DAS array for sensing solid Earth-atmosphere coupling processes.
  • Oct 2019. Congratulation to Guangchi (3rd year PhD student), his Q modeling paper to introduce a new viscoacoustic wave equation was accepted by JGR-Solid Earth. This paper is a milestone of modeling seismic wave propagation and will serve a basis for future seismic Earth imaging and inversion.
  • Sep 2019. We will have six talks in the coming SEG annual meeting:
  1. Chao Huang: Time-lapse full waveform inversion plus extended Kalman filter for high-resolution seismic models and uncertainty estimation
  2. Ning Wang: Accurately propagating P- and S-waves in attenuation media using spatial-independent-order decoupled fractional Laplacians
  3. Ning Wang:Compensating time-stepping error in fractional Laplacians viscoacoustic wavefield modeling
  4. Guangchi Xing: Frechet kernels based on a fractional viscoacoustic wave equation
  5. Tao Liu: Identifying and quantifying gas hydrate by joint analysis of P-wave velocity and resistivity
  6. Tieyuan Zhu: Hybrid multiplicative time-reversal imaging: Application to Marcellus shale microseismic data
  • Aug 2019. We have two talks in the 20th IAMG annual meeting:
  1. Guangchi Xing:Phenomenological models of frequency-independent Q seismic attenuation behavior using fractal mechanical networks
  2. Aoshuang Ji: Seismic attenuation improves the understanding of hydrate saturation and the gas hydrate morphology in south Hydrate Ridge
  • June 2019. Our proposed research on advancing the FWI of seismic attenuation received NSF funding.
  • Jan 2019. Our paper “Dynamics of geologic CO2 storage and plume motion revealed by seismic coda waves” is published in PNAS. Check the paper here PDF
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  • Dec 2018. Two AGU presentations by Guangchi Xing and Tieyuan Zhu. They are:”Phenomenological model of frequency-independent-Q viscoelastic behavior using fractal mechanical network” and “Dynamics of geologic CO2 storage revealed by seismic coda waves”
  • Oct 2018.  Dr. Tieyuan Zhu have received J. Clarence Karcher Award from SEG 2018 in recognition of his work in seismic attenuation via viscoacoustic theory, Q compensation in RTM, and expertise in computational geophysics. citation, about J. Clarence Karcher.
  • Sep 2018.  Welcome Ms. Nan Huai from Jilin U.,  Mr. Tao Liu from CUGB, and Ning Wang from CUP, as visiting students in our lab for a year.
  • August 2018.  Welcome Junzhu Shen from USTC and Zi Xian Leong from UW-Seatle, join us.
  • April 2018.  Congratulation to Guangchi, 1st year PhD student, for his presentation “Fractal mechanical network for frequency-independent Q model and its viscoacoustic wave equation” (ranked as the 2nd place of Pre-comp PhD) in the 51th Geoscience Graduate Student Colloquium. Well done!
  • March 2018.  Welcome our first Postdoc fellow Dr. Chao Huang from Tongji University, join us. His research interests mainly are (micro)seismic full waveform inversion.                                                                                                                                   ——————————————————————————————
  • Oct 2017. Our Geophysics paper [leading authors: Zhiguang Xue (UT) and Junzhe Sun (UT)] adapted my early viscoacoustic wave equation (Zhu and Harris, 2014) to accelerate full waveform inversion to invert seismic velocity model. This is the first time to use fractional Laplacian viscoacoustic wave equation for full waveform inversion. Check out our paper here!
  • August 2017. Our paper shows first time in situ seismic attenuation extracted from continuous active-source seismic monitoring data and we found attenuation (unlike seismic velocity) has sensitivity to CO2 injection through the three days’ injection period, which has been published in J. Geophys. Res.Check out my paper!
  • August 2017. Welcome our new group members, Mr. Guangchi Xing from Rice University, and Ms. Aoshuang Ji from Sun Yat-sen University. They will explore exploration seismology with me!                                                                                           ——————————————————————————————
  • July 2017. We published a paper to address issues on the stability of attenuation compensation for RTM in Geophysical Prospecting. Check out our paper!
  • June 2017. Congratulations to Ms. Mengyao Ji (U. of Houston), her SEG abstract (I am a co-author!) was accepted as an oral presentation in coming SEG annual meeting in Houston. Its title is “Using PSPI to accelerate seismic Q modeling based on Hermite-distributed approximating functional”.
  • May 2017. I published a paper in Geophysics to show simulations of anisotropic-attenuation waves.
  • Mar 2017.  Our paper entitled “Viscoelastic reverse-time migration with attenuation compensation” just came out in Geophysics. This paper show the theory of viscoelastic RTM with attenuation compensation to improve the PP and PS image resolution, which was highlighted in the section of Geophysics bright spot.
  • Jan 2017. Jie Yao, a Ph.D. student in ME from Uni. of Houston and his advisors in UH, and I published a paper in Geophysics to introduce a local method to improve the accuracy of solving the viscoacoustic wave equation with fractional Laplacian.