Andrew Graber, Ph.D.
Andrew Graber is a Research Geologist in the Landslide Hazards Program.
Andrew uses field, modeling, and remote sensing tools to study landslide hazards at a variety of spatial scales. His current projects focus on the changes in debris flow hazards following wildfire in response to recovery of vegetation and soil in burned areas.
Professional Experience
2022-Present: Research Geologist (Mendenhall post-doc), USGS Geologic Hazards Science Center, Golden, CO
Education and Certifications
2017-2022 Colorado School of Mines, Ph.D. Geological Engineering
2012-2016 Wheaton College, B.S. Geology
Science and Products
Compilation of runoff-generated debris-flow inventories for 18 fires across Arizona, California, Colorado, New Mexico, Utah, and Washington, USA
Description This data release is an inventory of runoff-generated postfire debris flows compiled from 18 burn areas across six western U.S. states. Debris-flow data from the following fires are included: Arizona: 2019 Museum, 2021 Flag, and 2022 Pipeline Fires California: 2014 Silverado, 2015 Valley, 2019 Briceburg, 2020 Dolan, 2020 El Dorado, 2020 Lake, and 2021 Dixie Fires Colorado...
Compilation of runoff-generated debris-flow inventories for 17 fires across Arizona, California, Colorado, New Mexico, and Washington, USA
Summary This data release is an inventory of runoff-generated postfire debris flows compiled from 17 burn areas across five western U.S. states. Debris-flow data from the following fires are included: Arizona: 2017 Pinal and 2019 Woodbury Fires California: 2020 Apple, 2020 Bond, 2015 Butte, 2020 El Dorado, 2014 El Portal, 2018 Ferguson, 2016 Fish (San Gabriel Complex), 2011 Motor, and...
Field-verified inventory of postfire debris flows for the 2021 Dixie Fire following a 23-25 October 2021 atmospheric river storm and 12 June 2022 thunderstorm
Summary This data release is a field-verified inventory of postfire debris flows for the 2021 Dixie Fire following a 23-25 October 2021 atmospheric river storm and 12 June 2022 thunderstorm. The “README.txt” file describes the fields for the “Inventory.csv” file. The “Chambers” and “Chips” rain gage data referenced in the inventory are included as: “Chambers-Oct2021-Storm.csv”, “Chambers...
How long do runoff-generated debris-flow hazards persist after wildfire?
Runoff-generated debris flows are a potentially destructive and deadly response to wildfire until sufficient vegetation and soil-hydraulic recovery have reduced susceptibility to the hazard. Elevated debris-flow susceptibility may persist for several years, but the controls on the timespan of the susceptible period are poorly understood. To evaluate the connection between vegetation...
Authors
Andrew Paul Graber, Matthew A. Thomas, Jason W. Kean
The rainfall intensity-duration control of debris flows after wildfire
Increased wildfire activity in the western United States has exposed regional gaps in our understanding of postfire debris-flow generation. To address this problem, we characterized flows in an unstudied area to test the rainfall intensity-duration control of the hazard. Our rainfall measurements and field observations from the northern Sierra Nevada (California, USA) show that debris...
Authors
Matthew A. Thomas, Donald N. Lindsay, David B. Cavagnaro, Jason W. Kean, Scott W. McCoy, Andrew Paul Graber
Non-USGS Publications**
Graber, A., Santi, P. (2023) UAV-photogrammetry rockfall monitoring of natural slopes in Glenwood Canyon, CO, USA: background activity and post-wildfire impacts. Landslides 20, 229–248. https://doi.org/10.1007/s10346-022-01974-9
Graber, A., & Santi, P. (2022). Power law models for rockfall frequency-magnitude distributions: review and identification of factors that influence the scaling exponent. Geomorphology, 418, 108463. https://doi.org/10.1016/J.GEOMORPH.2022.108463
Graber, A., & Santi, P. (2022). Inferring rockfall frequency-magnitude relationships and talus accumulation times from lichenometric study of talus deposits, Glenwood Canyon, CO, USA. Geomorphology, 408, 108253. https://doi.org/10.1016/J.GEOMORPH.2022.108253
Graber, A., Santi, P. & Meza Arestegui, P. (2021) Constraining the critical groundwater conditions for initiation of large, irrigation-induced landslides, Siguas River Valley, Peru. Landslides 18, 3753–3767. https://doi.org/10.1007/s10346-021-01767-6
**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
Compilation of runoff-generated debris-flow inventories for 18 fires across Arizona, California, Colorado, New Mexico, Utah, and Washington, USA
Description This data release is an inventory of runoff-generated postfire debris flows compiled from 18 burn areas across six western U.S. states. Debris-flow data from the following fires are included: Arizona: 2019 Museum, 2021 Flag, and 2022 Pipeline Fires California: 2014 Silverado, 2015 Valley, 2019 Briceburg, 2020 Dolan, 2020 El Dorado, 2020 Lake, and 2021 Dixie Fires Colorado...
Compilation of runoff-generated debris-flow inventories for 17 fires across Arizona, California, Colorado, New Mexico, and Washington, USA
Summary This data release is an inventory of runoff-generated postfire debris flows compiled from 17 burn areas across five western U.S. states. Debris-flow data from the following fires are included: Arizona: 2017 Pinal and 2019 Woodbury Fires California: 2020 Apple, 2020 Bond, 2015 Butte, 2020 El Dorado, 2014 El Portal, 2018 Ferguson, 2016 Fish (San Gabriel Complex), 2011 Motor, and...
Field-verified inventory of postfire debris flows for the 2021 Dixie Fire following a 23-25 October 2021 atmospheric river storm and 12 June 2022 thunderstorm
Summary This data release is a field-verified inventory of postfire debris flows for the 2021 Dixie Fire following a 23-25 October 2021 atmospheric river storm and 12 June 2022 thunderstorm. The “README.txt” file describes the fields for the “Inventory.csv” file. The “Chambers” and “Chips” rain gage data referenced in the inventory are included as: “Chambers-Oct2021-Storm.csv”, “Chambers...
How long do runoff-generated debris-flow hazards persist after wildfire?
Runoff-generated debris flows are a potentially destructive and deadly response to wildfire until sufficient vegetation and soil-hydraulic recovery have reduced susceptibility to the hazard. Elevated debris-flow susceptibility may persist for several years, but the controls on the timespan of the susceptible period are poorly understood. To evaluate the connection between vegetation...
Authors
Andrew Paul Graber, Matthew A. Thomas, Jason W. Kean
The rainfall intensity-duration control of debris flows after wildfire
Increased wildfire activity in the western United States has exposed regional gaps in our understanding of postfire debris-flow generation. To address this problem, we characterized flows in an unstudied area to test the rainfall intensity-duration control of the hazard. Our rainfall measurements and field observations from the northern Sierra Nevada (California, USA) show that debris...
Authors
Matthew A. Thomas, Donald N. Lindsay, David B. Cavagnaro, Jason W. Kean, Scott W. McCoy, Andrew Paul Graber
Non-USGS Publications**
Graber, A., Santi, P. (2023) UAV-photogrammetry rockfall monitoring of natural slopes in Glenwood Canyon, CO, USA: background activity and post-wildfire impacts. Landslides 20, 229–248. https://doi.org/10.1007/s10346-022-01974-9
Graber, A., & Santi, P. (2022). Power law models for rockfall frequency-magnitude distributions: review and identification of factors that influence the scaling exponent. Geomorphology, 418, 108463. https://doi.org/10.1016/J.GEOMORPH.2022.108463
Graber, A., & Santi, P. (2022). Inferring rockfall frequency-magnitude relationships and talus accumulation times from lichenometric study of talus deposits, Glenwood Canyon, CO, USA. Geomorphology, 408, 108253. https://doi.org/10.1016/J.GEOMORPH.2022.108253
Graber, A., Santi, P. & Meza Arestegui, P. (2021) Constraining the critical groundwater conditions for initiation of large, irrigation-induced landslides, Siguas River Valley, Peru. Landslides 18, 3753–3767. https://doi.org/10.1007/s10346-021-01767-6
**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.