Publications

Gregg, P.M., Zhan, Y., Amelung, F., Geist, D., Mothes, P., Koric, S., Yunjun, Z. (2022). Forecasting the June 26, 2018 Eruption of Sierra Negra Volcano, Galápagos – Ecuador. Science Advance, 22(8). DOI: 10.1126/sciadv.abm4261

Zhan, Y., Roman, D. C., Le Mével, H., & Power, J. A. (2022). Earthquakes Indicated Stress Field Change During the 2006 Unrest of Augustine Volcano, Alaska. Geophysical Research Letters, 49(10). https://doi.org/10.1029/2022GL097958

Zhan, Y., Le Mével, H., Roman, D., Girona, T., & Gregg, P.M. (2022) Modeling deformation, seismicity, and thermal anomalies driven by degassing during the 2005-2006 pre-eruptive unrest of Augustine Volcano, Alaska. Earth and Planetary Science Letters, 585(1). https://doi.org/10.1016/j.epsl.2022.117524

Lucas, L. C., Albright, J. A., Gregg, P. M., & Zhan, Y. (2022). The Impact of Ice Caps on the Mechanical Stability of Magmatic Systems: Implications for Forecasting on Human Timescales. Frontiers in Earth Science, 10. https://www.frontiersin.org/article/10.3389/feart.2022.868569

Zhan, Y., Gregg, P. M., & Lu, Z. (2021). Modeling Magma System Evolution During 2006–2007 Volcanic Unrest of Atka Volcanic Center, Alaska. Journal of Geophysical Research: Solid Earth, 126(2), e2020JB020158. https://doi.org/10.1029/2020JB020158

Lev, E., Hamilton, C. W., Voigt, J. R. C., Stadermann, A. C., Zhan, Y., & Neish, C. D. (2021). Emplacement conditions of lunar impact melt flows. Icarus, 369, 114578. https://doi.org/10.1016/j.icarus.2021.114578.

Zhan Y., Gregg P. M., Mével H. L., Miller C. A. and Cardona C. (2019) Integrating Reservoir Dynamics, Crustal Stress, and Geophysical Observations of the Laguna del Maule Magmatic System by FEM Models and Data Assimilation. Journal of Geophysical Research: Solid Earth 124, 13547–13562. (LINK)

Zhan Y. and Gregg P. M. (2019) How Accurately Can We Model Magma Reservoir Failure With Uncertainties in Host Rock Rheology? Journal of Geophysical Research: Solid Earth 124, 8030–8042. (LINK)

Gregg P. M., Le Mével H., Zhan Y., Dufek J., Geist D. and Chadwick Jr. W. W. (2018) Stress Triggering of the 2005 Eruption of Sierra Negra Volcano, Galápagos. Geophysical Research Letters 45, 13,288-13,297. (LINK)

Zhan, Y., Gregg, P.M., Chaussard, E., Aoki, Y., 2017. Sequential Assimilation of Volcanic Monitoring Data to Quantify Eruption Potential: Application to Kerinci Volcano, Sumatra. Front. Earth Sci. 5. (LINK)

Zhan Y. and Gregg P. M. (2017) Data assimilation strategies for volcano geodesy. Journal of Volcanology and Geothermal Research 344, 13–25. (LINK)

Zhan Y., Hou G., Kusky T. and Gregg P. M. (2016) Stress development in heterogenetic lithosphere: Insights into earthquake processes in the New Madrid Seismic Zone. Tectonophysics 671, 56–62. (LINK)

Zhan Y., Hou G., Hari K. R. and Shu W. (2015) Geochemical and isotopic constraints on the evolution of Late Paleozoic dyke swarms in West Junggar, Xinjiang, China. Journal of Asian Earth Sciences 113, 126–136. (LINK)

Zhan Y., Hou G., Sun X., Ju W., Shen Y., Zhao W., Ren K. and Zhang P. (2014) Quantitative Prediction of Tectonic Fractures of Jurassic Sandstones in the Eastern Kuche Depression. Geological Journal of China Universities 20, 294–302. (LINK)

SELECTED CONFERENCE ABSTRACTS

*undergraduate mentee

2020

  • Y. Zhan, P. M. Gregg, D. Roman, H. Le Mével, and M. Coombs, Modeling deformation and seismicity prior to the 2006 eruption of Augustine Volcano, Alaska. AGU Fall Meeting 2020 (Oral presentation).
  • H. Cabaniss, P. Gregg, Y. Zhan, S. Nooner, W. W. Chadwick, and W. Hefner. Modulation of Earthquakes at Axial Seamount, Juan de Fuca Ridge. AGU Fall Meeting 2020.
  • *L. Lucas, J Albright, P. Gregg, and Y. ZhanImpact of Ice Sheet Withdrawal on the Stability of Magma Systems. AGU Fall Meeting 2020.
  • *B. Dykstra, R. Goldman, Y. Zhan, and P. M. Gregg. Promoting Basal Slide and Flank Eruptions due to Edifice Relaxation in the Mauna Loa-Kīlauea Volcanic System, Hawaiʻi. AGU Fall Meeting 2020.

2019                    

  • Y. Zhan, P. M. Gregg, and Z. Lu, Modeling magma system evolution during 2005-2007 volcanic unrest of Atka volcanic center, Alaska, AGU Fall Meeting, 2019.
  • P. M. Gregg, Y. Zhan, F. Amelung, D. Geist, P. Mothes, S. Koric, Z. Yujun, Forecasting the June 26, 2018 eruption of Sierra Negra, Galapagos, AGU Fall Meeting, 2019.
  • P. M. Gregg, Y. Zhan, H. Le Mével, C. Miller, Linking thermomechanical models with geophysical observations to assess magma reservoir evolution at Laguna del Maule, Chile, AGU Fall Meeting, 2019.
  • E. Lev, C. Conroy, J. Birnbaum, Y. Zhan, Combining probabilistic methods and deterministic models to estimate uncertainties in lava flow parameters inferred from observations, AGU Fall Meeting, 2019.
  • J. Muller, S. Kemmerlin, J. Gonzalez-Santana, H. Shamloo, Y. J. Tan, Y. Zhan, C. Smith, P. M. Gregg, G. Abers, M. Myers, D. Roman, P. Wallace, B. Andrews, K. Cooper, T. Plank, G. Bergantz, Tectonic and compositional controls on magma storage depths: Results from CIDER 2019, AGU Fall Meeting, 2019.
  • *B. A. Dykstra, Y. Zhan, S. Marshak, P. M. Gregg, A. M. Anders, Effect of a trans-lithospheric weak zone on the magnitude of Paleozoic flexural uplift: A case study of the Ozark Dome, GSA Annual Meeting, 2019.
  • *B. Dykstra, Y. Zhan, S. Marshak, P. M. Gregg, A. Anders, Analyzing the Effects of Lithospheric Faults on Flexural Uplift Magnitude of the Ozark Plateau During the Paleozoic, SESE Research Review, 2019.
  • P. M. Gregg, Y. Zhan, H. Le Mével, J. A. Albright, H. E. Cabaniss, Linking thermomechanical models with geodetic observations to assess magma reservoir evolution and stability, IUGG General Assembly, 2019.
  • P. M. Gregg, Y. Zhan, F. Amelung, D. Geist, P. Mothes, S. Koric, Z. Yujun, Forecasting the June 26, 2018 eruption of Sierra Negra, Galapagos, IUGG General Assembly, 2019.

2018                      

  • Y. Zhan, P.M. Gregg, H Le Mével. Investigating the stability of the Laguna del Maule magmatic systemby modeling the stress state using data assimilation. AGU Fall Meeting Abstracts, 2018.
  • Y. Zhan, P.M. Gregg, F. Amelung, D. Geist, P.A. Mothes. Model forecasts of the 26 June 2018 Eruption of Sierra Negra Volcano, Galápagos. AGU Fall Meeting Abstracts, 2018.
  • P. M. Gregg, Y. Zhan, F. Amelung, D. Geist, P. Mothes, Model forecasts of the 26 June 2018 Eruption of Sierra Negra Volcano, Galápagos, AGU Fall Meeting, 2018.
  • P. M. Gregg, Y. Zhan, J. A. Albright, Z. Lu, J. Freymueller, F. Amelung, Imaging volcano deformation sources through geodetic data assimilation, UNAVCO Science Workshop, 2018.
  • P. M. Gregg, H. Le Mével, Y. Zhan, J. A. Albright, H. E. Cabaniss, Linking thermomechanical models with geodetic observations to assess magma reservoir evolution and stability, AGU Chapman Conference on Merging Geophysical, Petrochronologic, and Modeling Perspectives of Large Silicic Magma Systems, January 2018.

2017

  • Y. Zhan, P. M. Gregg, E. Chaussard, Y. Aoki. Investigation of volcanic unrest in Indonesia using statistical data assimilation with a two-source magma chamber model, IAVCEI, 2017.
  • P.M. Gregg, D. J. Fornari, M. R. Perfit, V. Romano, D. Wanless, D. Geist, S. Shirey, W. Ridley, M. Smith, C. Lundstrom, Y. Zhan, E. McCully, C. Trim, H. Cabaniss, J. Albright, B. Boulahanis, Y. Tan, Emplacement of the 8° 20’N Seamount Chain: Preliminary results from the 2016 OASIS Expedition, IAVCEI Scientific Assembly, Portland, OR, 2017.
  • *S. Griffin, P. M. Gregg, Y. Zhan, Investigating volcanic unrest and eruption potential at the Three Sisters Volcanoes in the Oregon Cascades, UIUC Undergraduate Research Symposium, 2017.
  • *S. Griffin, P. M. Gregg, Y. Zhan, Investigating volcanic unrest and eruption potential at the Three Sisters Volcanoes in the Oregon Cascades, SESE Research Review, 2017.

2016

  • Y. Zhan and P. M. Gregg, Data assimilation strategies for volcano geodesy, Goldschmidt, 2016.
  • Y. Zhan, P. M. Gregg, G. Hou, T. Kusky, Stress development in heterogenetic lithosphere: Insights into earthquake processes in the New Madrid Seismic Zone, GSA local conference, 2016.
  • *S. Griffin, P. M. Gregg, Y. Zhan, T. Monical, Investigating volcanic unrest and eruption potential at the Three Sisters Volcanoes in the Oregon Cascades, UIUC Undergraduate Research Symposium, 2016.

2015

  • Y. Zhan, P. M. Gregg, G. Hou, T. Kusky, Stress development in heterogenetic lithosphere: Insights into earthquake processes in the New Madrid Seismic Zone, AGU Fall Meet. Suppl., 2015.
  • J. C. Pettijohn, P. M. Gregg, and Y. Zhan, Sequential data assimilation strategies for utilizing ground deformation data to assess rapidly evolving magma reservoirs, AGU Fall Meet. Suppl., 2015.

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