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GMEG - Geophysics Unit of Menlo Park, CA- (GUMP)


Geophysics Unit of Menlo Park, CA (GUMP)

U.S. Geological Survey - Western Region - Geology and Geophysics

Selected publications:

Blakely, R. J., and Allan Cox, 1972, Identification of short polarity events by transforming marine magnetic profiles to the pole: Journal of Geophysical Research, v. 77, no. 23, p. 4339-4349.

Blakely, R.J., and Allan Cox, 1972, Evidence for short geomagnetic polarity intervals in the Early Cenozoic: Journal of Geophysical Research, v. 77, no. 35, p. 7065-7072.

Blakely, R. J., Cox, Allan, and Iufer, E. J., 1973, Vector magnetic data for detecting short polarity intervals in marine magnetic profiles: Journal of Geophysical Research, v. 78, no. 29, p. 6977-6983.

Blakely, R.J., 1974, Geomagnetic reversals and crustal spreading rates during the Miocene: Journal of Geophysical Research, v. 79, no. 20, p. 2979-2985.

Blakely, R. J., 1975, Evidence from magnetic anomalies of local migration of a spreading center: Geology, v. 3, no. 1, p. 35-38.

Blakely, R. J., Klitgord, K. D., and Mudie, J. M., 1975, Analysis of marine magnetic data: Reviews of Geophysics and Space Physics, v. 13, no. 3, p. 182-185.

Blakely, R. J., 1976, An age-dependent, two-layer model for marine magnetic anomalies, in The Geophysics of the Pacific Ocean Basin and Its Margin (Woollard Volume): American Geophysical Union Monograph 19, p. 227-234.

Blakely, R. J., and Lynn, W. S., 1977, Reversal transition widths and fast-spreading centers: Earth and Planetary Science Letters, v. 33, no. 3, p. 321-330.

Blakely, R. J., and Christiansen, R. L., 1978, The magnetization of Mount Shasta and implications for virtual geomagnetic poles determined from seamounts: Journal of Geophysical Research, v. 83, no. B12, p. 5971- 5978.

Blakely, R. J., 1979, Random crustal magnetization and its effect on coherence of short-wavelength marine magnetic anomalies: Earth and Planetary Science Letters, v. 46, p. 43-48.

Blakely, R. J., and Cande, S. C., 1979, Marine magnetic anomalies: Reviews of Geophysics and Space Physics, v. 17, no. 2, p. 204-214.

Blakely, R. J., and Hassanzadeh, Siamak, 1981, Estimation of depth to magnetic source using maximum entropy power spectra with application to the Peru-Chile Trench, in Nazca Plate: Crustal Formation and Andean Convergence: Geological Society of America Memoir 154, p. 667- 682.

Blakely, R. J., 1983, Statistical averaging of marine magnetic anomalies and the aging of the ocean crust: Journal of Geophysical Research, v. 88, p. 2289-2296.

Blakely, R. J., and Grauch, V. J. S., 1983, Magnetic models of crystalline terrane: Accounting for the effect of topography: Geophysics, v. 48, p. 1551-1557.

Blakely, R. J., Jachens, R. C., Simpson, R. W., and Couch, R. W., 1985, Tectonic setting of the southern Cascade Range as interpreted from its magnetic and gravity fields: Geological Society of America Bulletin, v. 96, p. 43-48.

Blakely, R. J., 1985, The effect of topography on aeromagnetic data in the wavenumber domain, in Proceedings of the International Meeting on Potential Fields in Rugged Topography, Bulletin 7, Institut de Géophysique de Université de Lausanne, Lausanne, Switzerland, p. 102-109.

Blakely, R. J., and McKee, E. H., 1985, Subsurface structural features of the Saline Range and adjacent regions of eastern California, as interpreted from their gravity and magnetic fields: Geology, v. 13, p. 781-785.

Blakely, R. J., and Simpson, R. W., 1986, Approximating edges of source bodies from magnetic or gravity anomalies: Geophysics, v. 51, p. 1494-1498.

Simpson, R. W., Jachens, R. C., Blakely, R. J., and Saltus, R. W., 1986, A new isostatic residual gravity map of the conterminous United States with a discussion of the significance of isostatic residual anomalies: Journal of Geophysical Research, v. 91, p. 8348-8372.

Blakely, R.J., 1987, Overview of geomagnetism and paleomagnetism, 1983-1986: Reviews of Geophysics, v. 25, p. 895-899.

Blakely, R.J., 1988, Curie-temperature isotherm analysis and tectonic implications of aeromagnetic data from Nevada: Journal of Geophysical Research, v. 93, p. 11,817-11,832.

Blakely, R. J., and Connard, G. C., 1989, Crustal studies using magnetic data, in Pakiser, L. C., and Mooney, W. D., eds., Geophysical framework of the continental United States: Geological Society of America Memoir 172.

Blakely, R.J., and Jachens, R.C., 1990, Volcanism, isostatic residual gravity, and regional tectonic setting of the Cascade volcanic province: Journal of Geophysical Research, v. 95, p. 19,439-19,451.

Blakely, R.J., and Jachens, R.C., 1991, Regional study of mineral resources in Nevada: Insights from three-dimensional analysis of gravity and magnetic anomalies: Geological Society of America Bulletin, v. 103, p. 795-803.

Shive, P.N., Blakely, R.J., Frost, B.R., and Fountain, D.M., 1992, Magnetic properties of the lower continental crust, in Fountain, D.M., Arculus, R., and Kay, R.W., editors, Continental lower crust: Developments in Geotectonics 23, Elsevier Publishing Company, Amsterdam, p. 145-177.

Saltus, R.W., and Blakely, R.J., 1993, HYPERMAG&emdash;An interactive, 2 and 2 1/2-dimensional gravity and magnetic modeling program, Version 3.5: U.S. Geological Survey Open-File Report 93-287, 39 p.

Blakely, R.J., and Stanley, W.D., 1993, The Geysers magma chamber, California: Constraints from gravity data, density measurements, and well information: Transactions of the Geothermal Resources Council, v. 17, p. 227-233.

Blakely, R.J., 1994, Extent of partial melting beneath the Cascade Range, Oregon: Constraints from gravity anomalies and ideal-body theory: Journal of Geophysical Research, v. 99, p. 2757-2773.

Grauch, V.J.S., Jachens, R.C., and Blakely, R.J., 1995, Evidence for a basement feature related to the Cortez disseminated gold trend and implications for regional exploration in Nevada: Economic Geology, v 90, p. 203-207.

Zoback, M.L., McKee, E.H., Blakely, R.J., and Thompson, G.A., 1994, The northern Nevada rift: Regional tectono-magmatic relations and middle Miocene stress direction: Geological Society of America Bulletin, v. 105, 371-382.

Blakely, R.J., 1995, Potential theory in gravity and magnetic applications: New York, Cambridge University Press, 441 p. (Reprinted in 1996.)

Blakely, R.J., Wells, R.E., Yelin, T.S., Madin I.P., and Beeson, M.H., 1995, Tectonic setting of the Portland-Vancouver area, Oregon and Washington: Constraints from low-altitude aeromagnetic data: Geological Society of America Bulletin, v. 107, p. 1051-1062.

Blakely, R.J., Christiansen, R.L., Guffanti, M., Wells, R.E., Donnelly-Nolan, J.M., Muffler, L.J.P., Clynne, M.A., and Smith, J.G., 1997, Gravity anomalies, Quaternary vents, and Quaternary faults in the southern Cascade Range, Oregon and California: Implications for arc and backarc evolution: Journal of Geophysical Research, v. 102, p. 22,513-22,257.

Blakely, R.J., Morin, R.L., McKee, E.H., Schmidt, K.M., Langenheim, V.E., and Dixon, G.L., 1998, Three-dimensional model of Paleozoic basement beneath Amargosa Desert and Pahrump Valley, California and Nevada: Implications for tectonic evolution and water resources: U.S. Geological Survey Open-File Report 98-496, 29 p.

Wells, R.E., Weaver, C.S., and Blakely, R.J., 1998, Fore-arc migration in Cascadia and its neotectonic significance: Geology, v. 26, p. 759-762.

Romanyuk, T.V., Blakely, R., and Mooney, W.D., 1998, The Cascadia subduction zone: Two contrasting models of lithospheric structure: Physics and Chemistry of the Earth, v. 23, p. 297-301.

Blakely, R.J., Jachens, R.C., Calzia, J. P., and Langenheim, V.E., 1999, Cenozoic basins of the Death Valley extended terrane as reflected in regional-scale gravity anomalies, in Wright, L. A., and Troxel, B.W., eds., Cenozoic basins of the Death Valley region, Geological Society of America Special Paper 333, p. 1-16, 1 plate.

Liberty, L.M., Trehu, A.M., Blakely, R.J., and Dougherty, M.E., 1999, Integration of high-resolution seismic and aeromagnetic data for earthquake hazards evaluations: an example from the Willamette Valley, Oregon: Seismological Society of America Bulletin, v. 89, p. 1473-1483.

Blakely, R.J., Wells, R.E., Tolan, T.L., Beeson, M.H., Trehu, A.M., and Liberty, L.M., 2000, New aeromagnetic data reveal large (?) strike-slip faults in the northern Willamette Valley, Oregon: Geological Society of America Bulletin, v. 112, p. 1225-1233.

Blakely, R.J., Langenheim, V.E., Ponce, D.A., and Dixon, G.L., 2000, Aeromagnetic survey of the Amargosa Desert, Nevada and California: a tool for understanding near-surface geology and hydrology: U.S. Geological Survey Open-File Report 00-188, 32 p., 2 plates.

Blakely, R.J., Langenheim, V.E., and Ponce, D.A., 2000, Summary of geophysical investigations of the Death Valley regional water-flow modeling project, Nevada and California: U.S. Geological Survey Open-File Report 00-189, 31 p., 2 plates.

Johnson, S.Y., Dadisman, S.V., Mosher, D.C., Blakely, R.J., and Childs, J.R., 2001, Active tectonics of the Devils Mountain fault and related structures, northern Puget Lowland and eastern Strait of Juan de Fuca region, Pacific Northwest: U.S. Geological Survey Professional Paper 1643, 45 p., 2 plates.

Brocher, T.M., Parsons, T., Blakely, R.J., Christensen, N.I., Fisher, M.A., Wells, R.E., and the SHIPS Working Group, 2001, Upper crustal structure in Puget Lowland, Washington: Results from the 1998 Seismic Hazards Investigation in Puget Sound: Journal of Geophysical Research, v. 106, p. 13,541-13,564.

Blakely, R.J., Wells, R.E., Weaver, C.S., and Johnson, S.Y., 2002, Location, structure, and seismicity of the Seattle fault zone, Washington: Evidence from aeromagnetic anomalies, geologic mapping, and seismic-reflection data: Geological Society of America Bulletin, v. 114, p. 169-177.

Parsons, T., Blakely, R.J., and Brocher, T.M., 2002, A simple algorithm for sequentially incorporating Bouguer gravity to enhance seismic traveltime tomography: International Geology Review, in press.

Wells, R.E., Blakely, R.J., Sugiyama, Y., Scholl, D.W., and Dinterman, P.A., 2003, Basin-centered asperities in great subduction zone earthquakes:  A link between slip, subsidence, and subduction erosion?  Journal of Geophysical Research, v. 108(B10), 2507, doi:10.1029/2002JB002072.

Blakely, R.J., Sherrod, B.L., Wells, R.E., Weaver, C.S., McCormack, D.H., Troost, K.G., and Haugerud, R.A., 2004, The Cottage Lake aeromagnetic lineament:  A possible onshore extension of the southern Whidbey Island fault, Washington:  U.S. Geological Survey Open-File Report 2004-1204, 60 pages,

Brocher, T.M., Blakely, R.J., and Wells, R.E., 2004, Reinterpretation of the Seattle uplift, Washington, as a passive roof duplex:  Bulletin of the Seismological Society of America, v. 94, p. 1379-1401.  

Blakely, R.J., Beeson, M.H., Cruikshank, K., Wells, R.E., Johnson, A., and Walsh, K., 2004, Gravity study through the Tualatin Mountains, Oregon: Understanding crustal structure and earthquake hazards in the Portland urban area: Bulletin of the Seismological Society of America, v. 94, p. 1402-1409.

Johnson, S.Y., Blakely, R.J., Stephenson, W.J., Dadisman, S.V., and fisher, M.A., 2004, Active shortening of the Cascadia forearc and implications for seismic hazards of the Puget Lowland:  Tectonics, v. 23, TC1011, doi:10.1029/2003TC001507, 27 pages.

Blakely, R.J., Brocher, T.M., and Wells, R.E., 2005, Subduction-zone magnetic anomalies and implications for hydrated forearc mantle:  Geology, v. 33, p. 445-448.

Saltus, R.W., Blakely, R.J., Hauessler, P.J., and Wells, R.E., 2005, Utility of aeromagnetic studies for mapping potentially active faults in two forearc basins:  Puget Sound, Washington, and Cook Inlet, Alaska:  Earth, Planets, Space, v. 57, p. 781-793.

Ross, H.E., Blakely, R.J., and Zoback, M.D., 2006, Testing the use of aeromagnetic data for the determination of Curie depth in California:  Geophysics, v. 71, p. L51-L59.

Blakely, R.J., John, D.A., Box, S.E., Berger, B.R., Fleck, R.J., Ashley, R.P., Newport, G.R., and Heinemeyer, G.R., 2007, Crustal controls on magmatic-hydrothermal systems:  A geophysical comparison of White River, Washington, with Goldfield, Nevada:  Geosphere, v. 3, p. 91-107.

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