• Honorary Doctorate of Science, Middlebury College, 2008
  • Ph.D., Geology, Univ. of Washington, 1977
  • M.S., Geology, Univ. of Washington, 1974
  • B.A., Geology, Middlebury College, 1972
Professional Experience:
  • Professor, Humboldt State University Geology Department
  • Chair, Humboldt State University Department of Geology, 2003-2005
  • Joined HSU 1977
Personal and Research Interests:

My research integrates field-based structural studies and geologic mapping with kinematic and microstructural analysis to address tectonic questions.  My interests include structures in active fault zones (from deformation bands to fault rocks), structural development of active margins, and regional tectonics of the western United States.  I’m currently involved in a collaborative project with undergraduate and graduate students and other researchers to investigate the tectonic development of the southern Cascadia forearc using a combination of field studies, thermochronometry, and geodynamic modelling.

Students studying deformation bands in a sea cliff exposure near the McKinleyville fault

Students studying deformation bands in a sea cliff exposure near the McKinleyville fault.


Structural geology students measuring slip direction indicators on the La Grange fault.Structural geology students measuring slip direction indicators on the La Grange fault.

Theses Supervised
Fudge, Emily, 2008, Evidence for regional extensional faulting at Grey Rocks Ridge, Eastern Klamath Mountains, California, 97p.
Crawford, Ryan, 2007, Earthquake history, microstructure, and fault frictional properties of near-surface sediments on the northern San Andreas Fault at Alder Creek, California, 67p

Elder, Don, 1991, Tectonic Control of Lode Gold Deposits, Quartz Hill, Klamath Mountains, California, 106p.


Blakely, Brian, 2014, Deformation band shear zone structure in an unconsolidated sand and gravel unit along the northern margin of the Mad River fault zone east of Patrick's Point, California coastal region

French, Kyle, 2011, Displacement patterns of cemetery monuments in Ferndale, California, during the MW 6.5 offshore northern California earthquake of January 10th, 2010

Utley, Shannon, 2011, Petrography and geochemistry of Monument Peak pluton, Weaverville, California

Cordes, Shaun, 2010, Geologic origin of the Chaparral Mountain block in the Klamath Mountains, southeast of Burnt Ranch, California

Guiterrez, Manuel, 2008, Structural evidence related to thrust faulting is consistent with fault-propagation folds of Little Salmon and Yager faults north of the Van Duzen River, Humboldt County, California

George, Orion, 2006, Investigation of cover sediments northwest of Hoopa, Klamath Mountains, California

Deis, Andrew, 2005, Porosity change related to deformation band formation in the McKinleyville Fault Zone, Humboldt County, California

Crawford, Ryan, 2004, Petrology and Microstructures of Ultramafic Rocks near Weaverville, California

Swanson, Karl, 2003, Geomorphic and Structural Features Adjacent to the San Andreas Fault at Bitterwater Valley, California

McGowan, Mark, 2001, Petrology and Geochemistry of Dacite Dikes, Eastern Klamath Mountains, California

Soule, Nathan, 2000, Fracturing Behavior of the McKinleyville Fault in Marine Terrace Sands in Humboldt County, California

Hughes, Colin R., 2000, Uplift History of Craggy Peak Pluton, and Implications on the Nature of the La Grange Fault, Klamath Mountains, California

Goldstein, Harland L., 1997, A Continuation of the La Grange Fault, Eastern Klamath Mountains, California

Townsend, Kellie, 1995, Petrology of Unusual Dacite Dikes, La Grange Fault, Eastern Klamath Mountains, California

Vadurro, Giovanni A., 1993, Strain Analysis of the Genoa Fault, Sierra Nevadan Frontal Fault System, NW Nevada and NE California

LeRoy, Thomas H., 1993, General Reconnaissance of the Northeast Side of Hyampom Valley: Evidence for a Late Cenozoic Structural Basin, Southern Klamath Mountains, California

Oswald, John, 1992, The Devil's Elbow Ophiolite Remnant: Comparison with the Josephine Ophiolite and Evidence for Post-Nevadan Faulting, California

Dern, Gregory, 1991, Composition of the La Grange Fault Mylonite, Eastern Klamath Mountains, California

DeJohn, Arthur, 1989, A Study of Fault Gouge from the Fickle Hill Fault, Humboldt County, California

Barrie, Donald, 1985, The Use of Radiolaria as Strain Indicators in a Block of Deformed Franciscan Chert, California

Draper, David, 1985, Strain Recorded in Radiolarian Cherts of the Franciscan Subduction Complex at Larabee Buttes, Northwest California: A Numerical Approach

Brady, Pat, 1984, Deformational History and Inferred Stress Orientations of a Unit of Plio-Pleistocene Sediments near Orick, Northwestern California

Pickens, William E., 1983, Small Scale Structures in a Portion of the Galice Formation, Klamath River Area, Northwestern California

Holt, Don Allen, 1982, Geology of the Klamath River Valley between Clearwater Gulch and Slate Creek, Northeastern Humboldt County, California

Pennington, Daryl, 1981, Particle Size Distribution and Retreat Rate of the Upper Regolith Slopes of Boars Tusk, Wyoming

Peer-Reviewed Publications

Gomberg, J., P. Bodin, J. Bourgeois, S. Cashman, D. Cowan, K. Creager, B. Crowell, A. Duvall, A. Frankel, F. Gonzalez, H. Houston, P. Johnson, H. Kelsey, U. Miller, E. Roland, D. Schmidt, L. Staisch, J. Vidale, W. Wilcock, and E. Wirth, 2016, Planning for a Subduction Zone Observatory: EOS, 97, doi:10.1029/2016EO052635.

Piotraschke, R., S.M. Cashman, K.P. Furlong, P.J.J. Kamp, and G. Xu, 2015, Unroofing the Klamaths – Blame it on Siletzia: Lithosphere, doi: 10.1130/L418.1

Kaproth, B.M., Cashman, S.M., and Marone, C., 2010, Deformation band formation and strength evolution in unlithified sand: the role of grain breakage: Journal of Geophysical Research, v.115, B12103, doi:10.1029/2010JB007406.

Batt,. G.E., Cashman, S.M., Garver, J.I., and Bigelow, J.J., 2010, Thermotectonic evidence for two-stage extension on the Trinity detachment surface, Eastern Klamath Mountains, California: American Journal of Science, v.310, p.261-281, DOI 10.2475/04.2010.12.

Cashman, S.M., Baldwin, J.N., Cashman, K.V., Swanson, K., and Crawford, R., 2007, Microstructures developed by coseismic and aseismic faulting in near-surface sediments, San Andreas Fault: Geology, v.35, p.611-614; doi: 101130/G23545A.1

Cashman, S.M., and Cashman, K.V., 2006, Cataclastic textures in La Grange fault rocks, Klamath Mountains, California: in Snoke, A.W., and Barnes, C.G., eds., Geological studies in the Klamath Mountains province, California and Oregon: A volume in honor of Wiliam P. Irwin: Geological Society of America Special Paper 410, p. 433-450, doii: 10.1130/2006.2410(21).

Schermer, E.R., R. Van Dissen, K.R. Berryman, H.M. Kelsey, and S.M. Cashman, 2004, Active faults, paleoseismology and historical fault rupture in the northern Wairarapa, North Island, New Zealand: New Zealand Journal of Geology and Geophysics, v.47, p.101-122.

Cashman, S.M. and Elder, D.R., 2002, Post-Nevadan detachment faulting in the Klamath Mountains, California: Geological Society of America Bulletin, v. 114, no. 12, p. 1520-1534.

Baldwin, J.N., A.D. Barron, K.I. Kelson, J.B. Harris, and S.M. Cashman, 2002, Preliminary paleoseismic and geophysical investigation of the North Farrenburg Lineament: Primary tectonic deformation associated with the New Madrid North Fault?: Seismological Research Letters, v. 73, no. 3, p. 393-413.

Cashman, S.M. and Cashman, K.V., 2000, Cataclasis and deformation band formation in unconsolidated marine terrace sand, Humboldt County, California: Geology, v. 28, no.2, p.111-114.

Kelsey, H.M., A.G. Hull, S.M. Cashman, K.R. Berryman, P.H. Cashman, J.T. Trexler, and J.G. Beggs, 1998, Paleoseismology of an active reverse fault in a forearc setting: The Poukawa fault zone, Hikurangi forearc, New Zealand: Geological Society of America Bulletin, v. 110, no. 9, p. 1123-1148.

Kelsey, H.M., S.M. Cashman, S. Beanland, and K.R. Berryman, 1995, Structural evolution at the inboard margin of the acccretionary wedge, Hikurangi forearc, New Zealand: Tectonics, v. 14, no.1, p.1-18.

Cashman, S. M., Kelsey, H. K., and Harden, D. R., 1995, Geology of the Redwood Creek basin, Northwestern California: U.S. Geological Survey Professional Paper 1454, Nolan, M., Kelsey, H., and Marron, D., eds., p. B1-B13.

Kelsey, H.M., C.F. Erdman, and S.M. Cashman, 1993, Geology of southern Hawkes Bay from the Maraetotara Plateau and Waipawa westward to the Wakarara Range and the Ohara Depression: Institute of Geological and Nuclear Sciences Science Report 93/2, 17p., Institute of Geological and Nuclear Sciences Limited, Lower Hutt, New Zealand.

Elder, D.R. and Cashman, S.M., 1992, Tectonic control and fluid evolution in the Quartz Hill, California, lode gold deposits:  Economic Geology, v. 87, p. 1795-1812.

Cashman, S. M., Kelsey, H. M., Erdman, C., Cutten, H. N. C., and Berryman, K. R., 1992,  A Structural Transect and Analysis of Strain Partitioning across the Forearc of the Hikurangi Subduction Zone, Southern Hawkes Bay, North Island, New Zealand: Tectonics, v.11, no.2, p. 242-257.

Cashman, S. M. and Kelsey, H. M., 1990, Forearc Uplift and Extension, Southern Hawke's Bay, New Zealand:  Mid-Pleistocene to Present:  Tectonics, v. 9, no. 1, p.23-44.

Cashman, S. M., 1988, Finite strain patterns associated with Nevadan deformation in the western Klamath Mountains, California--Possible structural evidence for large post-Nevadan tectonic rotation: Geology, v. 16, p. 839-843.

Cashman, S. M., Cashman, P. H., and Longshore, J. D., 1986, Deformational History and Regional Tectonic Significance of the Redwood Creek Schist, Northwestern California:  Geol. Soc. America Bull., v. 97, no. 1, p. 35-47.

Kelsey, H. M., and Cashman, S. M., l983, Wrench faulting in Northern California and its tectonic implications:  Tectonics, vol. 2, no. 6, p. 565-576.

Cashman, S. M., l980, Devonian metamorphism in the northeast Klamath Mountains, California:  Geol. Soc. America Bull., Part 1, v. 9l, p. 453-459.

McCulloh, T. H., Cashman, S. M., and Stewart, R. J., 1978, Diagenetic baselines for interpretive reconstructions of maximum burial depths and paleotemperatures in clastic sedimentary rocks:  D. F. Oltz, Ed., Symposium in Geochemistry, Low Temperature Metamorphism of Kerogen and Clay Minerals, Soc. Econ. Paleontologists and Mineralogists Spec. Pub., p. 18-46.

Bostick, N. H., Cashman, S. M., McCullock, T. H., and Waddell, C. T., 1978, Gradients of vitrinite reflectance and present temperature in the Los Angeles and Ventura Basins, California:  D. F. Oltz, Ed., Symposium in Geochemistry, Low Temperature Metamorphism of Kerogen and Clay Minerals, Soc. Econ. Paleontologists and Mineralogists Spec. Pub., p. 65-96.

Cashman, S. M., and Whetten, J. T., 1976, Low-temperature serpentinization of peridotite fanglomerate on the west margin of the Chiwaukum Graben, Washington:  Geol. Soc. America Bull., vol. 87, p. 1773-1776.

Sue Cashman

Contact Information:

Office: Founders Hall 16
Ph. 707 826-3114