Frank H. Webb Satellite Geodesy and Geodynamics Systems Group

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Frank H. Webb

Satellite Geodesy and Geodynamics Systems Group

Jet Propulsion Laboratory

Ph.D Division of Geological and Planetary Sciences, California Institute of Technology, June 1990, Geodetic Measurement of Deformation in the Offshore of southern California.

M.S., Geology, California Institute of Technology, June 1989.

B.A. Geology, University of California, Santa Barbara, Mar. 1984. Exchange student, University of Bergen, Norway, 1982-1983. Summa cum laude, Phi Beta Kappa, Exxon outstanding senior. Planetary Geology Undergraduate Research Program, NASA, participant, Spring 1984.
Research, responsibilites, and experience:

09/01-07/02 Proposal Manger for the Earth Change and Hazard Observatory (ECHO)

02/00-Present Group Supervisor for the Satellite Geodesy and Geodynamics Systems Group, JPL

06/99-Present JPL Program Element Manager for the Southern California Integrated GPS Network

10/96-05/99 Senior Member of the Technical Staff, JPL

03/90-09/96 Member of the Technical Staff, JPL


Group Supervisor of the Satellite Geodesy and Geodynamics Systems Group, JPL

Chair of the Plate Boundary Observatory Standing Committee (2002-present)

Executive Committee Chairman and JPL board member for the Southern California Integrated GPS Network (SCIGN) (1998-1999);

Executive Committee Member and JPL board member for the Southern California Integrated GPS Network (SCIGN) (1999- present)


GPS System Development, Task Manager

GPS Data Analysis, Task Manager

GPS User Support, Task Manager
Selected Papers and Publications

Preseismic transient slip during the 2001 Mw=8.4 Peru earthquake sequence from continuous GPS, Melbourne, T. I. And F. H. Webb, Geophys, Res. Lett, in press, 2002.

Estimating the motion of atmospheric water vapor using the Global Positioning System, Emardson, T. R., and F.H. Webb, GPS Solutions, in press, 2002.

Neutral atmospheric delay in interferometric synthetic aperture radar applications: Statistical description and mitigation, Emardson, T. R., M. Simons, F. H. Webb, JGR, in press, 2002

Broadband moment release in subduction zones, Melbourne, T. I., F. H. Webb, J. Stock, C. Reigber, Journ. Geophy. Res., in press, 2002.

Co-seismic slip from the July 30, 1995, Mw 8.1 Antofagasta, Chile, earthquake as constrained by radar interferometry and other geodetic measurements, Pritchard, M. E., M. Simons, P. A. Rosen, S. Hensley, F. H.Webb, Geophys. J. Int., 150, 362-376, 2002

Application of high-resolution, interferometric DEMs to geomorphic studies of fault scarps, Fish Lake Valley, Nevada-California, USA, D. Hooper, M. Bursik, and F. Webb, Remote Sensing of the Environment, in press, 2002.

Awards and Honors

2000 – NASA Honor Award for SCIGN Team

2000 – NASA Cert. of Recog. for AODA Team for Shuttle Radar Topography Mission

1999 – NASA Group Achievment Award

1996 – JPL Award for Excellence for Exceptional Quality in GPS

1992 – NASA Group Achievement Award OASIS/GIPSY Development Team

Biographical Sketch: Greg Anderson

Dr. Anderson is a Mendenhall Postdoctoral Fellow at the US Geological Survey in Pasadena. He received his Ph.D. in Earth Sciences from the University of California, San Diego (UCSD) in 1999, where he specialized in GPS and tiltmeter studies of crustal deformation and statistical studies of earthquake stress transfer. As a graduate student and postdoctoral researcher at UCSD, he led several field GPS surveys in southern California, including co-coordinating several large surveys following the 1999 Hector Mine earthquake, and was part of a team that designed a novel long-baseline tiltmeter for submarine volcano deformation monitoring. Since coming to the USGS in December 2001, he has developed software for rapid estimation of strain fields from SCIGN data, has studied crustal deformation in the Salton Trough from survey-mode GPS and trilateration, and is developing techniques for estimation of earthquake probabilities from geodetic data.

Compressed CV: Greg Anderson

Nov 1999 Ph.D., Earth Sciences, University of California, San Diego

Dec 1990 A.B., Geophysics, University of California, Berkeley

Dec 2001-present Mendenhall Postdoctoral Fellow, US Geological Survey, Pasadena

Jan-Dec 2001 Postdoctoral Fellow, Southern California Earthquake Center

Nov 1999-Dec 2000 Postgraduate Research Geophysicist, UC San Diego

Aug 1993-Nov 1999 Graduate Student Researcher, UC San Diego

Jan 1991-June 1993 Staff Research Associate, Berkeley Seismological Laboratory
Anderson, G., D.C. Agnew, and H.O. Johnson, 30 years of Salton Trough regional deformation estimated from combined trilateration and survey-mode GPS data, in preparation for submission to Bull. Seismol. Soc. Am., 2002.

Agnew, D.C., S. Owen, Z.-K. Shen, G. Anderson, J. Svarc, H. Johnson, K.E. Austin, and R. Reilinger, Coseismic displacement from the Hector Mine, California, earthquake: Results from survey-mode Global Positioning System measurements, Bull. Seismol. Soc. Am., 92, 1355-1364, 2002.

Owen, S., G. Anderson, D. C. Agnew, H. Johnson, K. Hurst, R. Reilinger, Z.-K. Shen, J. Svarc, and T. Baker, Early postseismic deformation from the 16 October 1999 Mw 7.1 Hector Mine, California, earthquake as measured by survey-mode GPS, Bull. Seismol. Soc. Am., 92, 1423-1432, 2002.

Tolstoy, M., S. Constable, J. Orcutt, H. Staudigel, F.K. Wyatt, and G. Anderson, Short and long baseline tiltmeter measurements on Axial Seamount, Juan de Fuca Ridge, Phys. Earth Planet. Int., 108, 131-143, 1998.

Anderson, G., S. Constable, H. Staudigel, and F.K. Wyatt, A seafloor long-baseline tiltmeter, J. Geophys. Res., 102, 20,269-20,285, 1997.
Yehuda Bock

Research Geodesist and Senior Lecturer (1993- present)

Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics

Scripps Institution of Oceanography · University of California, San Diego · 9500 Gilman Drive ·

La Jolla, California 92093-0225

Tel: 858) 534-5292; Fax: (858) 534-9873 · e-mail:;

Research Interests

Space Geodesy (GPS and InSAR)

Crustal Deformation, Plate Motion, Earthquake Hazards

GPS Meteorology and Climatology

Real-Time Positioning of Dynamic Platforms with GPS

Geographic Information Systems (GIS)


Ph.D., 1982; M.S., 1980, Geodetic Science, The Ohio State University

B.Sc., 1977, Geodetic Engineering, Technion-Israel Inst. of Technology, with honors

B.A., 1971, Mathematics, New York University, Dean’s list

Academic Experience

Research Geodesist and Senior Lecturer, Scripps Institution of Oceanography, UCSD, 1993- ; Assoc. Adjunct Professor and Assoc. Research Geophysicist 1989-1993

Visiting Scientist, Technion, Israel Institute of Technology, Haifa, Israel ,1996

Visiting Scientist, Tel Aviv Univ., Israel, 1995

Staff Scientist, Jet Propulsion Laboratory, Pasadena, California, 1989-1992

Research Scientist, Massachusetts Institute of Technology, 1984-1989; Lecturer, 1986

Visiting Associate Professor, Gadjah Mada Univ., Yogyakarta, Indonesia, 1987

Geophysics Research Scholar, Air Force Geophysics Laboratory, 1982-1984

Graduate Research Associate, The Ohio State University, 1977-1982

Administrative Posts

Director, Scripps Orbit and Permanent Array Center (SOPAC), 1993 to present, Permanent GPS Geodetic Array (PGGA), 1993- , UNAVCO Orbit Facility, 1992-1997, IGS Global Data Center and Global Analysis Center, 1992-

Director, California Spatial Reference Center (CSRC), 1999 to present,

Member, Southern California Integrated GPS Network (SCIGN) Executive Committee and Coordinating Board, 1995 to present (Chair, 1997-1998; Vice-Chair, 1999-present),


Certificate of Appreciation for Outstanding Service, International GPS Service, 1999

Certificate of Appreciation, International GPS Service for Geodynamics, 1994

Fellow, International Association of Geodesy, 1991

The Karrina and Weikko A. Heiskanen Award, Department of Geodetic Science and Surveying, The Ohio State University, Columbus, 1989

Field and Laboratory Experience

Co-developer (with Robert King) of GAMIT GPS software package, 1985-

Co-founder (with Shimon Wdowinski) of continuous GPS array in Israel and Jordan, 1997-2002

GPS projects in Indonesia, Italy (Venice), Japan, southern California, 1989-

Professional Activities

Western North America Plate Boundary Observatory Steering Committee, 1999-2002

SCEC Crustal Deformation Working Group, 1991- 2001

IGS Steering Committee and Governing Board, 1991-1999

IAG Executive Committee, 1995-1999

Lecturer, International GPS School, Delft, the Netherlands, 1995, 1997

Editorial Board, Manuscripta Geodaetica, 1992-1995; Editorial Board, Journal of Geodesy, 1996-1998; Associate Editor, Journal of Geophysical Research, 1998-

Recent Relevant Publications

Bock Y., S. Wdowinski, P. Fang, J. Zhang, J. Behr, J. Genrich, S. Williams, D. Agnew, F. Wyatt, H. Johnson, K. Stark, B. Oral, K. Hudnut, S. Dinardo, W. Young, D. Jackson, and W. Gurtner, Southern California Permanent GPS Geodetic Array: Continuous measurements of crustal deformation between the 1992 Landers and 1994 Northridge earthquakes, J. Geophys. Res., 102, 18,013-18,033, 1997.

Bock, Y., R. Nikolaidis, P. J. de Jonge, and M. Bevis, Instantaneous resolution of crustal motion at medium distances with the Global Positioning System, J. Geophys. Res., 105, 28,223-28,254, 2000.

Chadwell, C. D. and Y. Bock, Direct estimation of absolute precipitable water in oceanic regions by GPS tracking of a coastal buoy, Geophys. Res. Lett., 28, 3701-3704, 2001.

Nikolaidis, R., Y. Bock, P. Shearer, P. J. de Jonge, D.C. Agnew, and M. Van Domselaar, Seismic wave observations with the Global Positioning System, J. Geophys. Res., 106, 21,897-21,916, 2001.

Wdowinski, S., Y. Sudman, and Y. Bock, Distribution of interseismic deformation along the San Andreas fault system, southern California, Geophys. Res. Lett., 28, 2321-2324, 2001.

Other Recent Publications

Dong, D., P. Fang, Y. Bock, M. K. Cheng, and S. Miyazaki, Anatomy of apparent seasonal variations from GPS-derived site position time series, J. Geophys. Res., 107(B4), 10.1029/JB2001JB000573, ETG 9, 1-18, 2001.

Genrich, J. F., Y. Bock, and R. Mason, Crustal deformation across the Imperial Fault: Results from kinematic GPS surveys and trilateration of a densely-spaced, small-aperture network, J. Geophys. Res., 102, 4985-5004, 1997.

Walls, C., T. Rockwell, K. Mueller, Y. Bock, S. Williams, J. Pfanner, J. Dolan, and P. Fang, Escape tectonics in the Los Angeles metropolitan region and implications for seismic risk, Nature, 394, 356-360, 1998.

Watson, K. M., Y. Bock, and D. T. Sandwell, Satellite interferometric observations of displacements associated with seasonal ground water in the Los Angeles basin, J. Geophys. Res., 107(B4), 10.1029/2001JB000470, ETG 8, 1-16, 2001.

Williams, S., Y. Bock, and P. Fang, Integrated Satellite Interferometry: Tropospheric noise, GPS estimates and their implications for Interferometric SAR products, J. Geophys. Res., 103, 27,051-27,067 1998.

Total numbers of graduate students advised: 9

Total number of postdoctoral scholars sponsored: 7

Danan Dong

1988 - 1993 Ph.D. in Geodynamics and Geodesy, MIT

1982 - 1984 M.S. in Geodynamics, Shanghai Observatory, Academia Sinica

1979 - 1982 B.S. in Geophysics, Dept. of Geophysics, Peking University

Work Experience:

1998 - Senior Technical Staff, JPL

1993 - 1998 Technical Staff, JPL

Summer-1992 Visiting Scientist, Ashtech Inc.

1988 - 1993 Research Assistant, Dept. of EAPS, MIT

1987 - 1988 Visiting Scientist, Dept. of EAPS, MIT

1984 - 1987 Research Associate, Shanghai Observatory

Professional Activities:

Member of American Geophysical Union since 1987


NASA group award for SCIGN network analysis (2000)

NASA award for the creative work on software QOCA (1999)

The Second Science and Technology Award of Academia Sinica (1989)

The Second Excellent Essays Award for the Young in Shanghai (1984)

The Fourth Science and Technology Award of Seismology Bureau of China (1984)


Dong, D., T. Yunck, and M. Heflin, The origin of international terrestrial reference frame, submitted to J. Geophys. Res, under review, 2002

Zhang, F. P., et al., Seasonal vertical crustal motions in China detected by GPS, Bulletin of Science, 47, #18, 1370-1377, 2002.

Dong, D., P. Fang, Y. Bock, M. K. Cheng, and S. Miyazaki, Anatomy of apparent seasonal variations from GPS derived site position time series, J. Geophys. Res, 107, B4, ETG 9-1 – ETG 9-16, 2002

Shen, Z-K, et al., Crustal deformation along the Altyn Tagh fault system, western China, from GPS, J. Geophys. Res, 106, 30607-30622, 2001

Shen, Z-K, et al., Contemporary crustal deformation in East Asia constrained by Global Positioning System measurements, J. Geophys. Res, 105, 5721-5734, 2000

Argus, D. F., et al., Shortening and thickening of metropolitian Los Angeles measured and inferred by using geodesy, Geology, 27, 703-706, 1999

Hager, B. H., et al., Reconciling rapid strain accumulation with deep seismogenic fault planes in the Ventura Basin, California, J. Geophys. Res, 104, 25207-25219, 1999

Dong, D., T. A. Herring and R. W. King, Estimating Regional deformation from a combination of space and terrestrial geodetic data, Journal of Geodesy, 72, 200-214, 1998
Sharon Kedar Ph.D. 

 Jet Propulsion Laboratory · 4800 Oak Grove Drive , Pasadena, CA 91109 

Tel: (818) 393-6808 · Fax: (818) 393-4965 · E-mail:


- Data reduction and processing - Experiment design and execution

- Data analysis - Software development

- Computer modeling


06/1996 Ph.D. Geophysics California Institute of Technology

06/1989 B.Sc Geophysics and Planetary Sciences Tel Aviv University

Work Experience

08/2001 – present Member of Technical Staff JPL / Satellite Geodesy and Geodynamics Systems

GPS data analysis and applications

04/2000 – 04/2001 Staff scientist California Institute of Technology / Seismological Laboratory,

Data analysis and computer modeling

07/1996 – 06/1998 NSF postdoctoral fellow - United States Geological Survy - Volcano Hazards

Broad-Band monitoring of active volcanoes

Hazard assessment

Continuous Seismic and Electromagnetic monitoring at Long Valley

06/1989 – 06/1996 Ph.D. Student California Institute of Technology

Underwater pressure measurement inside Old Faithful Geyser, Yellowstone

Development of slow earthquake detection scheme for Southern California

Nuclear explosion detection


1996 National Science foundation Geosciences postdoctoral fellowship -2nd place nationally

Select Publications

Waveform inversion of very long period impulsive signals associated with magmatic injection beneath Kilauea Volcano, Hawaii , Ohminato, T., Chouet, B. A., Dawson, P. B., and Kedar S., Joutnal of Geophyical Research, 103, no. 10, 23,839-23,862, 1998

Bubble collapse as the source of tremor at Old Faithful Geyser, Kedar, S., Kanamori, H., Sturtevant, B., Journal of Geophysical Research, 103, no. 10,24,283-24,299, 1998

    Kedar, Sturtevant and Kanamori; The Origin of Harmonic Tremor at Old Faithful Geyser, Nature, 379, 708-711, 1996

    Kedar and Kanamori; Continuous Monitoring of Seismic Energy Release, Bulletin of the Seismological Society of America. 86 (1A), 255-258, 1996

Compressed CV: Nancy King

June 1990 Ph.D., Earth Sciences, University of California, San Diego

June 1973 B.A., Mathematics, University of California, San Diego

May 1997-present Geophysicist, U.S. Geological Survey, Pasadena

Sep 1990-May 1997 Geophysicist, U.S. Geological Survey, Menlo Park

Jun 1990-Sep 1990 Postgraduate Research Geophysicist, UC San Diego

Sep 1984-Jun 1990 Graduate Student Researcher, UC San Diego

Aug 1973-Sep 1984 Mathematician, U.S. Geological Survey, Menlo Park
King, N.E., J.L. Svarc, E.B. Fogleman, W.K. Gross, K.W. Clark, G.D. Hamilton, C.H. Stiffler, and J.M. Sutton, Continuous GPS observations across the Hayward fault, California, 1991-1994, Journal of Geophysical Research, 100, 20271-20283, 1995
King, N.E., and Thatcher, W., The coseismic slip distributions of the 1940 and 1979 Imperial Valley, California, earthquakes, Journal of Geophysical Research, 103, 19069-18086, 1998
Scientists from the U.S. Geological Survey, Southern California Earthquake Center, and California Division of Mines and Geology, Preliminary report on the 16 October 1999 M 7.1 Hector Mine, California, Earthquake, Seismological Research Letters, 71, 11-23, 2000
Hudnut, K.W., H.E. King, J.E. Galetzka, K.F. Stark, J.A. Behr, A. Aspiotes, S. van Wyk, R. Moffitt, S. Dockter, and F. Wyatt, Continuous GPS observations\ of postseismic deformation following the 16 October 1999 Hector Mine, California, Earthquake (M 7.1), Bulletin of the Seismological Society of America, 92, 1403-1422, 2002
King, N.E., K. Hurst, J. Langbein, M. van Domselaar, Comparison and combination of solution from the Southern California Integrated GPS Network, Eos, Transactions, American Geophysical Union Fall Meeting, Suppl. 82, F292, 2001
King, N.E., M. Heflin, T. Herring, Hurst, K., Kedar, S., Langbein, J., and L. Prawirodirdjo, Toward an ITRF2000 Combined Solution for the Southern California Integrated GPS Network, AGU Fall Meeting, (no Eos reference yet), 2002

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