Dr. Sharon Kedar

  • California Institute of Technology - Geophysics PhD – June 1996
  • Tel Aviv University – Geophysics and Planetary Sciences BSc - June 1988

Research Interests: 
  • Solid Earth Geophysics and Geodynamics
  • Ocean – Solid-Earth coupling
  • Space geodesy
  • Ionospheric effects on radio (GPS) signals
  • Volcanology
  • Sensor-webs

Professional Experience: 

General : Seismologist/GPS-geodesist; Expertise in a wide range of geophysical phenomena Jet Propulsion Laboratory - California Institute of Technology August 2001 - Present

  • Initiation of innovative research concepts in geophysics
  • Lead research and development team
  • Southern California Integrated GPS Network (SCIGN) data production and analysis
  • Integration OF GPS and seismic data analysis
  • Proposal writing and managing

NSF postdoctoral fellow in the Earth sciences June 1996 – June 1998 United States Geological Survey - Volcano Hazards

  • Postdoctoral research fellow
  • Volcano hazard assessment
  • Broadband analysis of volcanic seismic signals

Selected Publications: 
  1. Dong, D., P. Fang, Y. Bock, F. Webb, L. Prawirodirdjo, S. Kedar, and P. Jamason, Spatiotemporal filtering using principal component analysis and Karhunen-Loeve expansion approaches for regional GPS network analysis, J. Geophys. Res, 111(B03405), DOI:10.1029/2005JB003806, 2006
  2. The Ocean’s seismic Hum, Kedar S. and Webb F. H., Science, 207, 682-683, Febtuary 4, 2005
  3. The effect of the second order GPS ionospheric correction on receiver positions, Kedar S., G. A. Hajj, B. D. Wilson, M. B. Heflin, Geophys. Res. Lett., 30 (16), 1829, doi:10.1029/2003GL017639, 2003.
  4. Bubble collapse as the source of tremor at Old Faithful Geyser, Kedar, S., H. Kanamori, B. Sturtevant, J. Geophys. Res., 103(B10), 24283-24300, 10.1029/98JB01824, 1998.
  5. Waveform inversion of very long period impulsive signals associated with magmatic injection beneath Kilauea Volcano, Ohminato, T., B. A. Chouet, P. Dawson, S. Kedar, Hawaii, J. Geophys. Res., 103(B10), 23839-23862, 10.1029/98JB01122, 1998.
  6. The origin of harmonic tremor at Old Faithful geyser, Nature 379, 708 - 711 (22 Feb 1996) (Cover)
  7. Continuous Monitoring of Seismic Energy Release Associated with the 1994 Northridge Earthquake and the 1992 Landers Earthquake, Kedar, Sharon; Kanamori, Hiroo, Seis. Res. Lett., V86, No. 1a, pp. 255-258, 1996
  8. The 1989 Macquarie Ridge earthquake - Seismic moment estimation from long-period free oscillations, S. Kedar, S. Watada, and T. Tanimoto, J. Geophys. Res., 99, 17,893-17,908, 1994
  9. ML:Mo as a regional seismic discriminant, Woods, BB; Kedar, S; Helmberger, DV, Bul. Seis. Soc. Am., V. 83, pp. 1167 – 1183, 1993
  10. NASA Tech Brief: Monitoring Volcanoes by Use of Air-Dropped Sensor Packages, Sharon Kedar, Tommaso Rivellini, Frank Webb, Brent Blaes, and Caroline Bracho of Caltech and Andrew Lockhart and Ken McGee of the USGS for NASA's Jet Propulsion Laboratory. NPO-30827, September 2003


  1. The Origin of Ocean Microseisms, S. Kedar, R. Clyaton, N. Graham, C. Jones, F. Webb, EGU, 2006
  2. Approaches for the Detection of Microseism Generating Regions from Space, Rodriguez E., Kedar S., Fall AGU, 2004
  3. The effect of the 2nd order ionosphere correction on GPS orbits and station positions, Kedar, S, Hajj, G A, Komjathy, A, Wilson, B D, Bertiger, W I, Fall AGU 2004
  4. Improved GPS time series in Southern California through the combination of SOPAC and JPL solutions, Dong, D, Prawirodirdjo, L, Kedar, S, Fang, P, Newport, B, Jamason, P, Webb, F, AU: Bock, Y, Fall AGU 2004
  5. Regularized Deterministic Annealing Hidden Markov Models for Identification and Analysis of Seismic and Aseismic events, R A Granat, R Clayton, S Kedar, Y Kaneko, Fall AGU, 2003
  6. Tilt and broadband analysis of the February 1996 inflation episode of Kilauea, Hawaii, Kedar S., Chouet B., Ohminato T., and Dawson P., IRIS/UNAVCO annual meeting, June 2002.
  7. Broadband analysis of the February 1996 inflation episode of Kilauea Caldera, Hawaii, Kedar, Sharon; Chouet, Bernard A; Dawson, Phillip B, Eos, Transactions, American Geophysical Union, vol.78, no.46, Suppl., pp.442, 18 Nov 1997
  8. The origin of harmonic tremor at Old Faithful Geyser, Kedar, Sharon; Sturtevant, Bradford; Kanamori, Hiroo, Eos, Transactions, American Geophysical Union, vol.78, no.46, Suppl., pp.808, 18 Nov 1997
  9. Continuous monitoring of seismic and electromagnetic radiation in Long Valley, Kedar, Sharon; Fraser-Smith, Anthony; Johnston, Malcolm J S; Hill, David P, Eos, Transactions, American Geophysical Union, vol.78, no.46, Suppl., pp.476, 18 Nov 1997
  10. Harmonic tremor at Old Faithful Geyser; source and path, cause and effect, Kedar, Sharon; Sturtevant, Bradford; Kanamori, Hiroo, Eos, Transactions, American Geophysical Union, vol.76, no.46, Suppl., pp.350, 07 Nov 1995
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