All Stories

  1. Modeling barometric pumping of martian methane: Implications for Perseverance sample timing and gas loss from drilled cores

    Article • Icarus, November 2025, Elsevier

    John Ortiz

  2. Preferential adsorption of noble gases in zeolitic tuff with variable saturation: A modeling study of counter-intuitive diffusive-adsorptive behavior

    Article • Journal of Environmental Radioactivity, February 2025, Elsevier

    John Ortiz

  3. Rethinking Porosity-Based Diffusivity Estimates for Sorptive Gas Transport at Variable Temperatures

    Article • Environmental Science & Technology, October 2024, American Chemical Society (ACS)

    John Ortiz

  4. Sub‐Diurnal Methane Variations on Mars Driven by Barometric Pumping and Planetary Boundary Layer Evolution

    Article • Journal of Geophysical Research Planets, January 2024, American Geophysical Union (AGU)

    John Ortiz

  5. Sub-diurnal methane variations on Mars driven by barometric pumping and planetary boundary layer evolution

    Article • August 2023, Wiley

    John Ortiz

  6. Gas diffusion through variably-water-saturated zeolitic tuff: Implications for transport following a subsurface nuclear event

    Article • Journal of Environmental Radioactivity, September 2022, Elsevier

    John Ortiz

  7. Barometric Pumping Through Fractured Rock: A Mechanism for Venting Deep Methane to Mars' Atmosphere

    Article • Geophysical Research Letters, July 2022, American Geophysical Union (AGU)

    John Ortiz

  8. From Manhattan to Mars: Applying models of subsurface radionuclide gas seepage from nuclear testing to understand methane release from the Martian subsurface [Slides]

    Article • November 2021, Office of Scientific and Technical Information (OSTI)

    John Ortiz

  9. Continental‐Scale Geographic Trends in Barometric‐Pumping Efficiency Potential: A North American Case Study

    Article • Geophysical Research Letters, August 2021, American Geophysical Union (AGU)

    John Ortiz

  10. Laboratory Investigation of Gas Transport Through Variably Saturated Rock [Slides]

    Article • May 2021, Office of Scientific and Technical Information (OSTI)

    John Ortiz

  11. Geologic characterization of nonconformities using outcrop and core analogs: hydrologic implications for injection-induced seismicity

    Article • Solid Earth, October 2020, Copernicus GmbH

    John Ortiz

  12. Beyond Barnwell: Applying lessons learned from the Barnwell site to other historic underground nuclear tests at Pahute Mesa to understand radioactive gas-seepage observations

    Article • Journal of Environmental Radioactivity, October 2020, Elsevier

    John Ortiz

  13. Geologic characterization of nonconformities using outcrop and whole-rock core analogues: hydrologic implications for injection-induced seismicity

    Article • March 2020, Copernicus GmbH

    John Ortiz

  14. Supplementary material to "Geologic characterization of nonconformities using outcrop and whole-rock core analogues: hydrologic implications for injection-induced seismicity"

    Article • March 2020, Copernicus GmbH

    John Ortiz

  15. Identification of dominant gas transport frequencies during barometric pumping of fractured rock

    Article • Scientific Reports, July 2019, Springer Science + Business Media

    John Ortiz, Senior Hydrogeologist Philip H Stauffer

  16. Evidence for High Rates of Gas Transport in the Deep Subsurface

    Article • Geophysical Research Letters, April 2019, American Geophysical Union (AGU)

    John Ortiz, Senior Hydrogeologist Philip H Stauffer

  17. Fault structures can increase risk of human-caused earthquakes

    Article • Ground Water, September 2018, Wiley

    John Ortiz

  18. Immobile Pore-Water Storage Enhancement and Retardation of Gas Transport in Fractured Rock

    Article • Transport in Porous Media, May 2018, Springer Science + Business Media

    John Ortiz

  19. Summary of a Gas Transport Tracer Test in the Deep Cerros Del Rio Basalts, Mesita del Buey, Los Alamos NM.

    Article • January 2018, Office of Scientific and Technical Information (OSTI)

    John Ortiz, Senior Hydrogeologist Philip H Stauffer

  20. Exploring the potential linkages between oil‐field brine reinjection, crystalline basement permeability, and triggered seismicity for the Dagger Draw Oil field, southeastern New Mexico, USA , using hydrologic modeling

    Article • Geofluids, October 2016, Wiley

    John Ortiz

  21. Investigating the role of complex sandbar morphology on nearshore hydrodynamics

    Article • Journal of Coastal Research, April 2014, Coastal Education and Research Foundation

    John Ortiz