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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

 

 

Darcy Karakelian McPhee

Research Geophysicist
Geophysical Unit of Menlo Park, CA (GUMP)

U.S. Geological Survey
345 Middlefield Road, MS989
Menlo Park, CA 94025
phone: (650) 329-4173
fax: (650) 329-5133
email: dmcphee@usgs.gov

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CV

 


SPECIALTIES

Potential field and electromagnetic (EM) geophysics. I develop and utilize gravity, magnetic, and electromagnetic interpretation and measurement techniques for solving subsurface geologic problems.

 

RESEARCH INTERESTS

Current work:

  • Three-dimensional mapping of the Santa Rosa Plain, northern San Francisco Bay Region, California
  • Geophysical modeling across the central California segment of the San Andreas Fault, including Parkfield, CA
  • Resistivity imaging in eastern Nevada using the audiomagnetotelluric (AMT) method for hydrogeologic framework studies
  • Geophysical studies of the Tualatin Basin, Oregon for understanding the role of Columbia River Basalts in the geohydrologic system
Past research:

My research has focussed on investigating whether ultra-low frequency electromagnetic waves (ULF-EM) are associated with earthquakes with emphasis on data collection and processing. My general objectives are as follows:

Other research
  • Biophysics Project (University of Pennsylvania Dental School, Department of Pathology, Jan. 1995-March 1996): Characterization of Actinobacillus actinomycetemcomitans leukotoxin pore formation in HL60 cells
  • High Energy Astrophysics Project (University of Pennsylvania, Department of Physics, Summer 1994)

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PUBLICATIONS

Karakelian, D., J. D. Lear, E. T. Lally, and J. C. Tanaka, 1998, Characterization of Acti nobacillus actinomycetemcomitans leukotoxin pore formation in HL60 cells, Biochemica et Biophysica Acta 1406, 175-187.

Lear, J.D., Karakelian, D., Furblur, U., Lally, E.T., and Tanaka, J.C., 2000, Conformational studies of Actinobacillus actinomycetemcomitans leukotoxin: Partial denaturation enhances toxicity: Boichemica et Biophysica Acta- Protein Structure and Molecular Enzymology, v. 1476, p. 350-362.

Karakelian, D., Klemperer, S.L., Beroza, G.C., and Fraser-Smith, A.C., 2000, A transportable system for monitoring ultra-low frequency electromagnetic signals associated with earthquakes:Seismological Research Letters, v. 71, p. 423-436.

Karakelian, D., Klemperer S.L., Thompson, G.A., Fraser-Smith, A.C., 2000, Results from electromagnetic monitoring of the Mw 5.1 San Juan Bautista, California earthquake of 12 August 1998, in Bokelmann, G., and Kovach, R.L., (eds), Proceedings of the 3rd Conference on Tectonics Problems of the San Andreas Fault System:  Stanford University Publication, Geological Sciences, v. XXI.)

Karakelian, D., Beroza, G.C., Klemperer, S.L., and Fraser-Smith, A.C., 2002, Analysis of ultra-low frequency electromagnetic field measurements associated with the 1999 M 7.1 Hector Mine earthquake sequence, in Rymer, Michael J; Langenheim, Victoria E; Hauksson, Egill, (eds.), The Hector Mine, California, earthquake of 16 October 1999: Bulletin of the Seismological Society of America, v.92, no.4, p.1,513-1,524.

Karakelian, D., Klemperer, S.L., Fraser-Smith, A.C., and Thompson, G.A., 2002, Ultra-low frequency electromagnetic measurements associated with the 1998 Mw 5.1 San Juan Bautista, California earthquake and implications for mechanisms of electromagnetic earthquake precursors: Tectonophysics, v. 359, p. 65-79.

Karakelian, D., 2002, Ultra-low frequency electromagnetic signals associated with earthquakes and fault creep in California, Stanford University Ph.D. dissertation, 128 p.

McPhee, D.K., Jachens, R.C., and Wentworth, C.M., 2004, Crustal structure across the San Andreas Fault at the SAFOD site from potential field and geologic studies, in Hickman, S., Zoback, M., and Ellsworth, W., (eds.), Preparing for the San Andreas Fault Observatory at Depth: Earthquakes and Crustal Structure: Geophysical Research Letters, v. 31, L12S03.

Roecker, S., Thurber, C., and McPhee, D., 2004, Joint inversion of gravity and arrival time data from Parkfield: New constraints on structure and hypocenter locations near the SAFOD drill site, in Hickman, S., Zoback, M., and Ellsworth, W., (eds.), Preparing for the San Andreas Fault Observatory at Depth: Earthquakes and Crustal Structure: Geophysical Research Letters, v. 31, L12S04.

Langenheim, V.E., Roberts, C.W., McCabe, C.A., McPhee, D.K., Tilden, J.E., and Jachens, R.C., 2006, Preliminary isostatic gravity map of the Sonoma Volcanic Field and vicinity, Sonoma and Napa Counties, California:  U.S. Geological Survey Open-File Report 2006-1056 (http://pubs.usgs.gov/of/2006/1056/).

McPhee, D.K., Pellerin, L., Chuchel, B., Tilden, J.E., and Dixon, G.L., 2006, Resistivity imaging in eastern Nevada using the audiomagnetotellurics method for hydrogeologic framework studies, in Proceedings of the 19th Annual Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP), Seattle, WA.

Langenheim, V.E.,  McPhee, D.K., McCormick, W.V., McLaughlin, R.J., and McCabe, C.A., Stop 2: Overlook of the Rodgers Creek Fault, Santa Rosa Pull-Apart Basin, and the Santa Rosa Plain from the Peak of Taylor Mountain in Hecker, S., and Kelsey, H., (compilers), History and Pre-History of Earthquakes in Wine and Redwood Country, Sonoma and Mendocino Counties, California, in Prentice, C.S., Scotchmoor, J.G., Moores, E.M., and Kiland, J.P., eds., 1906 San Francisco Earthquake Centennial Field Guides: Field Trips Associated with the 100th Anniversary Conference,18-23 April 2006, San Francisco, California:  Geological Society of America Field Guide 7, p. 339-372.
 
McPhee, D.K., Chuchel, B.A., and Pellerin, L., 2006, Audiomagnetotelluric data from Spring, Cave, and Coyote Spring Valleys, Nevada:  U.S. Geological Survey Open-File Report 2006-1164, 41p. (http://pubs.usgs.gov/of/2006/1164/)

Morin, R.L., Wheeler, K.L., McPhee, D.K., Dinterman, P.A., and Watt, J.T., 2007, Principal facts of gravity data in the northern Willamette Valley and vicinity, northwestern Oregon and southwestern Washington:  U.S. Geological Survey Open-File Report 2007-1058 (http://pubs.usgs.gov/of/2007/1058/).
     
McPhee, D.K., Chuchel, B.A., and Pellerin, L., 2007, Audiomagnetotelluric data and 2D models from Spring, Snake, and Three Lakes Valleys, Nevada:  U.S. Geological Survey Open-File Report 2007-XXXX, XXp.

Glen, J.M.G., Schmidt, J., Pellerin , L., O’Niell, M., and McPhee, D.K., Crustal structure of Wrangellia and adjacent terranes inferred from geophysical studies along a transect through the northern Talkeetna Mountains, Geological Society of America, Special Publication  (in press)

McPhee, D.K., Langenheim, V.E., Hartzell, S., McLaughlin, R.J., Aagaard, B.T., Jachens, R.C., and McCabe, C., 2007, Basin Structure beneath the Santa Rosa Plain, northern California:  Implications for damage caused by the 1969 Santa Rosa and 1906 San Francisco earthquakes, Bulletin of the Seismological Society of America (in press). preprint (pdf)


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