Dr. Kristoffer T. Walker

Asst. Project Scientist walker@ucsd.edu

IGPP, Scripps, Univ. of California, San Diego phone : 858-534-0126

9500 Gilman Avenue, MC 0225 fax : 858-534-9873

La Jolla, California 92093-0225 http://sail.ucsd.edu/~walker/

Education

§ Stanford University – Ph.D. in Geophysics (2004)

§ Stanford University – M.S. in Geophysics (2000)

§ University of Delaware – B.S. with Distinction in Geophysics, Cum Laude, Math Minor (1998)

Selected Research Interests

§ Infrasound propagation, array processing, and source physics

§ Interferometric sensor development

§ Reverse-time migration and imaging techniques

Peer-Reviewed Publications

Walker, K.T., Bokelmann, G.H.R., Klemperer, S.L., 2001, Shear-wave splitting to test mantle deformation models around Hawaii, Geophys. Res. Lett., 28, 4319-4322.

Walker, K.T., Bokelmann, G.H.R., Klemperer, S.L., 2003, Reply to Comment by L. P. Vinnik et al., Geophys. Res. Lett., 28, 1676.

Walker, K.T., McGeary, S.E., and Klemperer, S.L., 2003, Evolution of the Bristol Bay basin, southeast Bering Sea: Constraints from seismic reflection and potential field data, Tectonics, 22, 1049.

Walker, K., Bokelmann, G., and Klemperer, S., 2004, Shear-wave splitting beneath the Snake River Plain suggests a mantle upwelling beneath eastern Nevada, USA, Earth Planet. Sci. Lett., 222, 529-542.

Walker, K.T., Nyblade, A.A., Bokelmann, G.H.R., Klemperer, S.L., and Owens, T.J., 2004, On the relationship between extension and anisotropy: Constraints from shear-wave splitting across the East African Plateau, J. Geophys. Res., 109, B08302.

Gashawbeza, E., Nyblade, A., Klemperer, S.L., Walker, K.T., and Keranen, K.T., 2004, Shear-wave splitting in Ethiopia: Precambrian mantle anisotropy locally modified by Neogene rifting, Geophys. Res. Lett., 31, L18602.

Walker, K.T., Bokelmann, G.H.R., Klemperer, S.L., and Bock, G., 2005, Shear-wave splitting around the Eifel hotspot: evidence for a mantle upwelling, Geophys. J. Int., 163, 962-980.

Walker, K.T., Bokelmann, G.H.R., Klemperer, S.L., and Nyblade, A., 2005, Shear-wave splitting around hotspots: Evidence for upwelling-related mantle flow?, in G. Foulger, J.H. Natland, D.C. Presnall, and D.L. Anderson (Eds.), Plates, Plumes, and Paradigms: Geological Society of America Special Paper 388, p. 171-192.

Walker, K.T., Ishii, M., and Shearer, P.M., 2005, Rupture details of the 28 March 2005 Sumatra Mw 8.6 earthquake imaged with teleseismic P waves, Geophys. Res. Lett., 32, L24303.

Walker, K.T., Bokelmann, G.H.R., Klemperer, S.L., Bock, G., and the Eifel Plume Team, 2007, Seismic aniosotropy in the asthenosphere beneath the Eifel region, Western Germany, in J.R.R. Ritter and U.R. Christensen (Eds.), Mantle Plumes: A Multidisciplinary Approach, VIII, p. 439-464.

Walker, K.T., Zumberge, M.A., Hedlin, M.A.H., and Shearer, P., 2008, Methods for determining infrasound phase velocity direction with an array of line sensors, J. Acoust. Soc. Am., 124, 2090-2099.

De-Groot Hedlin, C.D., Hedlin, M.A.H., Walker, K.T., Drob, D.P., and Zumberge, M.A., 2008, Study of infrasound propagation from the Shuttle Atlantis using a large seismic network, J. Acoust. Soc. Am., 123, 3829-3829.

Walker, K.T., and Shearer, P., 2009, Illuminating the near-sonic rupture velocities of the intracontinental Kokoxili Mw 7.8 and Denali Mw 7.9 strike-slip earthquakes with global P-wave back projection imaging, J. Geophys. Res., 114, B02304, doi:10.1029/2008JB005738.

Walker, K.T., and Hedlin, M.A.H., A review of wind noise reduction methodologies, in: Infrasound Monitoring for Atmospheric Studies, ed. by A. Le Pichon, E. Blanc, and A. Hauchecorne, [in press].

Professional Experience

§ Asst. Project Scientist, IGPP, Scripps, Univ. of California, SD (2009).

§ Cecil & Ida Green Scholar, IGPP, Scripps, Univ. of California, SD (2005-06).

§ Postdoctoral Researcher, IGPP, Scripps, Univ. of California, SD (2004-09).

§ Participant, Summer of Applied Geophysical Experience program (1998). A field-oriented

geophysical program focused on the integration of various data to address geophysics problems.

§ Lead Investigator, Snake River Plain Experiment (2000-01). A seven-station, passive-source

seismic experiment to help constrain the mantle dynamics beneath the Snake River Plain, Idaho.

§ Field Assistant for various seismic reflection and refraction projects, 1996, 1999, and 2003.

§ Summer Internship, Phillips Petroleum Co. (1999). Seismic reflection analyst for World

Exploration Division, Bartlesville, Oklahoma.

§ Teaching Assistant, Stanford University (1999-01): Wave Propagation, Seismic Reflection

Interpretation, Introduction to UNIX, Planetary Exploration, and Natural Hazards and Human

Survival.

Computer Experience

§ Languages: C, C++, Fortran, Matlab, PHP, sendmail, serial ports, web services

§ Software: CSS3, PGPLOT, Antelope, SAC, GFS, ANSYS, Petrosys, ProMAX, SeisWorks

§ System administration: Mac, Linux/UNIX, and Windows

Selected Service Activities

§ Reviewer for J. Geophys. Res., Geophys. J. Int., Bull. Seis. Soc. Am., Geology, Earth and Planet. Sci. Lett., and Geophys. Res. Lett. (2004-08).

§ Reviewer for seismology and infrasound NSF proposals (2005-07).

§ Graduate Student Council, Stanford Univ. (2002-03).

§ Stanford university committees (2002-03): Student Services Working Group, Graduate Housing and Advisory Committee, and Land and Building Development.

§ President (1997-98) of Geo Club in Dept. of Geology, Univ. of Delaware.

HONORS, AWARDS, AND MEMBERSHIPS

§ Phi Beta Kappa Honor Society

§ Golden Key National Honor Society

§ Excellence awards from the Univ. of Delaware (1996-98)

§ American Geophysical Union

§ Geological Society of America

§ Acoustic Society of America

§ Society of Photo-optical Instrumentation Engineers (SPIE)