Geoff Cromwell, PhD
Geoff Cromwell is a geologist at the California Water Science Center in Santa Maria, California
Dr. Cromwell's research explores hydrologic systems processes through the development of three-dimensional geologic and hydrogeologic framework models and integrating those models with groundwater, surface-water, and geophysical data. The scope of his work ranges from basin-scale to national-scale, from areas that are data-poor to areas that are data-rich, with a focus on understanding the geologic and hydrogeologic controls on hydrologic systems.
Professional Experience
Geologist at USGS California Water Science Center, Santa Maria, CA (2016 – Present)
Adjunct Assistant Professor in Geology at Occidental College, Los Angeles, CA (2014 – 2015)
Hydrologist at USGS California Water Science Center, San Diego, CA (2014 – 2015)
Hydrologic Technician–Student Trainee at USGS California Water Science Center, San Diego, CA (2011 – 2014)
Education and Certifications
Ph.D., Earth Sciences, Scripps Institution of Oceanography, University of California San Diego, 2014
M.S., Earth Sciences, Scripps Institution of Oceanography, University of California San Diego, 2010
B.A., Geology, Occidental College, 2008
Science and Products
Filter Total Items: 15
Santa Barbara and Foothill groundwater basins Geohydrology and optimal water resources management—Developed using density dependent solute transport and optimization models Santa Barbara and Foothill groundwater basins Geohydrology and optimal water resources management—Developed using density dependent solute transport and optimization models
Groundwater has been a part of the city of Santa Barbara’s water-supply portfolio since the 1800s; however, since the 1960s, the majority of the city’s water has come from local surface water, and the remainder has come from groundwater, State Water Project, recycled water, increased water conservation, and as needed, seawater desalination. Although groundwater from the Santa Barbara and...
Authors
Scott R. Paulinski, Tracy Nishikawa, Geoffrey Cromwell, Scott E. Boyce, Zachary P. Stanko
Against the current— The Mojave River from sink to source: The 2018 Desert Symposium field trip road log Against the current— The Mojave River from sink to source: The 2018 Desert Symposium field trip road log
The Mojave River evolved over the past few million years by “fill and spill” from upper basins near its source in the Transverse Ranges to lower basins. Each newly “spilled into” basin in the series? sustained a long-lived lake but gradually filled with Mojave River sediment, leading to spill to a yet lower elevation? basin. The Mojave River currently terminates at Silver Lake, near...
Authors
David M. Miller, R.E. Reynolds, Krishangi D. Groover, David C. Buesch, H. J. Brown, Geoffrey Cromwell, Jill N. Densmore, A.L. Garcia, D. Hughson, J.R. Knott, Jeffrey E. Lovich
Water-resources and land-surface deformation evaluation studies at Fort Irwin National Training Center, Mojave Desert, California Water-resources and land-surface deformation evaluation studies at Fort Irwin National Training Center, Mojave Desert, California
The U.S. Army Fort Irwin National Training Center (NTC), in the Mojave Desert, obtains all of its potable water supply from three groundwater basins (Irwin, Langford, and Bicycle) within the NTC boundaries (fig. 1; California Department of Water Resources, 2003). Because of increasing water demands at the NTC, the U.S. Geological Survey (USGS), in cooperation with the U.S. Army...
Authors
Jill N. Densmore, Justine E. Dishart, David M. Miller, David C. Buesch, Lyndsay B. Ball, Paul A. Bedrosian, Linda R. Woolfenden, Geoffrey Cromwell, Matthew K. Burgess, Joseph Nawikas, David O’Leary, Adam Kjos, Michelle Sneed, Justin T. Brandt
Non-USGS Publications**
Cromwell, G., Tauxe, L., Staudigel, H., Constable, C.G., Koppers, A.A.P., Pedersen, R.-B., 2013, In search of long-term hemispheric asymmetry in the geomagnetic field: Results from high northern latitudes, Geochemistry Geophysics Geosystems, 14, 8, (3234-3249), https://doi.org/10.1002/ggge.20174. Non-USGS Affiliation.
Cromwell, G., Constable, C.G., Staudigel, H., Tauxe, L., Gans, P., 2013, Revised and updated paleomagnetic results from Costa Rica, Geochemistry Geophysics Geosystems, 14, 9, (3379-3388), https://doi.org/10.1002/ggge.20199. Non-USGS Affiliation.
Cromwell, G., Tauxe, L., Staudigel, H., Ron, H., 2015, Paleointensity estimates from historic and modern Hawaiian lava flows using glassy basalt as a primary source material, Physics of the Earth and Planetary Interiors, 241, (44-56), https://doi.org/10.1016/j.pepi.2014.12.007. Non-USGS Affiliation.
Cromwell, G., Tauxe, L., Halldórsson, S.A., 2015, New paleointensity results from rapidly cooled Icelandic lavas: Implications for Arctic geomagnetic field strength, Journal of Geophysical Research, Solid Earth, 120, 5, (2913-2934), https://doi.org/10.1002/2014JB011828. Non-USGS Affiliation.
Cai, S., Tauxe, L., and Cromwell, G., 2017, Paleointensity from subaerial basaltic glasses from the Second Hawaii Scientific Drilling Project (HSDP2) core and implications for possible bias in data from lava flow interiors: Journal of Geophysical Research: Solid Earth, 122, https://doi.org/10.1002/2017JB014683. Non-USGS Affiliation.
Cromwell, G., Johnson, C.L., Tauxe, L., Constable, C.G., and Jarboe, N.A, 2018, PSV10: A Global Data Set for 0–10 Ma time‐averaged field and paleosecular variation studies, Geochemistry Geophysics Geosystems, 19, 5, (1533-1558), https://doi.org/10.1002/2017GC007318. Non-USGS Affiliation, [C:60, D:90, I:70, W:80].
Miles, N.D., Deustua, S.E., Tancredi, G., Schnyder, G., Nesmachnow, S., and Cromwell, G., 2021, Using cosmic rays detected by HST as geophysical markers. I. Detection and characterization of cosmic rays: The Astrophysical Journal, 916 (86), 28 p., https://doi.org/10.3847/1538-4357/abfa9b. Non-USGS Affiliation, [C:10, D:10, I:10, W:10].
Cromwell, G., and Zhang, Y., 2021, New paleointensity data from Aniakchak volcano, Alaska, USA; Geochemistry Geophysics Geosystems, 22, e2021GC010032. https://doi.org/10.1029/2021GC010032. Non-USGS Affiliation, [C:100, D:60, I:70, W:70].
Cych, B., Tauxe, L., Cromwell, G., Sinton, J., and Koppers, A.A.P., 2023, Changes in non-dipolar field structure over the Plio-Pleistocene: New paleointensity results from Hawai`i compared to global data sets: Journal of Geophysical Research—Solid Earth, 128, 6, https://doi.org/10.1029/2023JB026492. Non-USGS Affiliation.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 15
Santa Barbara and Foothill groundwater basins Geohydrology and optimal water resources management—Developed using density dependent solute transport and optimization models Santa Barbara and Foothill groundwater basins Geohydrology and optimal water resources management—Developed using density dependent solute transport and optimization models
Groundwater has been a part of the city of Santa Barbara’s water-supply portfolio since the 1800s; however, since the 1960s, the majority of the city’s water has come from local surface water, and the remainder has come from groundwater, State Water Project, recycled water, increased water conservation, and as needed, seawater desalination. Although groundwater from the Santa Barbara and...
Authors
Scott R. Paulinski, Tracy Nishikawa, Geoffrey Cromwell, Scott E. Boyce, Zachary P. Stanko
Against the current— The Mojave River from sink to source: The 2018 Desert Symposium field trip road log Against the current— The Mojave River from sink to source: The 2018 Desert Symposium field trip road log
The Mojave River evolved over the past few million years by “fill and spill” from upper basins near its source in the Transverse Ranges to lower basins. Each newly “spilled into” basin in the series? sustained a long-lived lake but gradually filled with Mojave River sediment, leading to spill to a yet lower elevation? basin. The Mojave River currently terminates at Silver Lake, near...
Authors
David M. Miller, R.E. Reynolds, Krishangi D. Groover, David C. Buesch, H. J. Brown, Geoffrey Cromwell, Jill N. Densmore, A.L. Garcia, D. Hughson, J.R. Knott, Jeffrey E. Lovich
Water-resources and land-surface deformation evaluation studies at Fort Irwin National Training Center, Mojave Desert, California Water-resources and land-surface deformation evaluation studies at Fort Irwin National Training Center, Mojave Desert, California
The U.S. Army Fort Irwin National Training Center (NTC), in the Mojave Desert, obtains all of its potable water supply from three groundwater basins (Irwin, Langford, and Bicycle) within the NTC boundaries (fig. 1; California Department of Water Resources, 2003). Because of increasing water demands at the NTC, the U.S. Geological Survey (USGS), in cooperation with the U.S. Army...
Authors
Jill N. Densmore, Justine E. Dishart, David M. Miller, David C. Buesch, Lyndsay B. Ball, Paul A. Bedrosian, Linda R. Woolfenden, Geoffrey Cromwell, Matthew K. Burgess, Joseph Nawikas, David O’Leary, Adam Kjos, Michelle Sneed, Justin T. Brandt
Non-USGS Publications**
Cromwell, G., Tauxe, L., Staudigel, H., Constable, C.G., Koppers, A.A.P., Pedersen, R.-B., 2013, In search of long-term hemispheric asymmetry in the geomagnetic field: Results from high northern latitudes, Geochemistry Geophysics Geosystems, 14, 8, (3234-3249), https://doi.org/10.1002/ggge.20174. Non-USGS Affiliation.
Cromwell, G., Constable, C.G., Staudigel, H., Tauxe, L., Gans, P., 2013, Revised and updated paleomagnetic results from Costa Rica, Geochemistry Geophysics Geosystems, 14, 9, (3379-3388), https://doi.org/10.1002/ggge.20199. Non-USGS Affiliation.
Cromwell, G., Tauxe, L., Staudigel, H., Ron, H., 2015, Paleointensity estimates from historic and modern Hawaiian lava flows using glassy basalt as a primary source material, Physics of the Earth and Planetary Interiors, 241, (44-56), https://doi.org/10.1016/j.pepi.2014.12.007. Non-USGS Affiliation.
Cromwell, G., Tauxe, L., Halldórsson, S.A., 2015, New paleointensity results from rapidly cooled Icelandic lavas: Implications for Arctic geomagnetic field strength, Journal of Geophysical Research, Solid Earth, 120, 5, (2913-2934), https://doi.org/10.1002/2014JB011828. Non-USGS Affiliation.
Cai, S., Tauxe, L., and Cromwell, G., 2017, Paleointensity from subaerial basaltic glasses from the Second Hawaii Scientific Drilling Project (HSDP2) core and implications for possible bias in data from lava flow interiors: Journal of Geophysical Research: Solid Earth, 122, https://doi.org/10.1002/2017JB014683. Non-USGS Affiliation.
Cromwell, G., Johnson, C.L., Tauxe, L., Constable, C.G., and Jarboe, N.A, 2018, PSV10: A Global Data Set for 0–10 Ma time‐averaged field and paleosecular variation studies, Geochemistry Geophysics Geosystems, 19, 5, (1533-1558), https://doi.org/10.1002/2017GC007318. Non-USGS Affiliation, [C:60, D:90, I:70, W:80].
Miles, N.D., Deustua, S.E., Tancredi, G., Schnyder, G., Nesmachnow, S., and Cromwell, G., 2021, Using cosmic rays detected by HST as geophysical markers. I. Detection and characterization of cosmic rays: The Astrophysical Journal, 916 (86), 28 p., https://doi.org/10.3847/1538-4357/abfa9b. Non-USGS Affiliation, [C:10, D:10, I:10, W:10].
Cromwell, G., and Zhang, Y., 2021, New paleointensity data from Aniakchak volcano, Alaska, USA; Geochemistry Geophysics Geosystems, 22, e2021GC010032. https://doi.org/10.1029/2021GC010032. Non-USGS Affiliation, [C:100, D:60, I:70, W:70].
Cych, B., Tauxe, L., Cromwell, G., Sinton, J., and Koppers, A.A.P., 2023, Changes in non-dipolar field structure over the Plio-Pleistocene: New paleointensity results from Hawai`i compared to global data sets: Journal of Geophysical Research—Solid Earth, 128, 6, https://doi.org/10.1029/2023JB026492. Non-USGS Affiliation.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.