QOCA products

QOCA products

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Vertical annual motion at global GPS sites (downloadable)
Annual vertical displacements at global GPS sites (SOPAC after pole tide correction solution)

Annual vertical displacements at global GPS sites caused by Atmosphere (purple arrow), non-tidal ocean (red arrow), snow (green arrow) and soil moisture (blue arrow)

Horizontal velocity field in California and Nevada

Velocity map in Kobe region, Japan

Velocity map in northen China

Annual vertical "deformation" in Chubu region, Japan (label of 30 mm/yr should be 30 mm)

Time series of JPLM-DS10 baseline

Vertical common mode error (CME) in California and Nevada

Postseismic deformation field of Landers earthquake


Recent publications using QOCA analysis:
  • Hammond, W. C. and W. Thatcher, Contemporary tectonic deformation of the Basin and Range province, western United States: 10 years of observation with the Global Positioning System J. G. R., 109(B08403), doi:10.1029/2003JB002746, 2004.
  • Pondrelli, S., C. Piromallo, and E. Serpelloni, Convergence vs. retreat in Southern Tyrrhenian Sea: Insights from kinematics, Geophys. Res. Lett., 31, L06611, doi:10.1029/2003GL019223, 2004.
  • Savage, J. C., W. Gan, W. H. Prescott, and J. L. Svarc, Strain accumulation across the Coast Ranges at the latitude of San Francisco, 1994-2000 J. G. R., 109(B03413), doi: 10.1029/2003JB002612, 2004
  • Savage, J. C., J. L. Svarc, and W. H. Prescott, Interseismic strain and rotation rate in the northeast Mojave domain, eastern California, J. G. R., 109(B02406), doi: 10.1029/2003JB002705, 2004
  • Savage, J. C., J. L. Svarc, and W. H. Prescott, Near-field postseismic deformation associated with the 1992 Landers and 1999 Hector Mine, California, earthquakes, J. G. R., 108(B9), doi: 10.1029/2002JB002330, 2003
  • Dong, D., Seasonal vertical variations from GPS-derived site position time series, Proceedings of "Workshop on the State of GPS Vertical Positioning Precision: Separation of Earth Processes by Space Geodesy", Luxembourg, 2003
  • Miyazaki, S., J. J. McGuire, and P. Segall, A transient subduction zone slip episode in southwest Japan observed by the nationwide GPS array, J. G. R., 108(B2), doi: 10.1029/2001JB000456, 2003
  • Wang, M., Z.K.Shen, et al., Contemporary Crustal Deformation of Chinese Continent and Tectonic Block Model, Science in China(series D), 2002, supp.(in Chinese)
  • Serpelloni E., et al., Combination of permanent and non-permanent GPS networks for the evaluation of the strain-rate field in the central Mediterranean area. In press on Bull. Geof. Theo. Appl., 2002
  • Serpelloni E., et al., Geodetic deformation in the centeral-southern Apennines (Italy) from repeated GPS surveys, Annals of Geophysics 44(3), 627-647, 2001
  • Anzidei M., et al., Insight into present-day crustal motion in the central Mediterranean area from GPS surveys, Geiphys. J. Int. 146, 98-110, 2001
  • Zhang, F. P., et al., Seasonal vertical crustal motions in China detected by GPS, Bulletin of Science (in Chinese), 47, #18, 1370-1377, 2002
  • Svarc, J. L., J. C. Savage, W. H. Prescott, and A. R. Ramelli: Strain accumulation and rotation in western Nevada, 1993-2000, J. G. R., 107, B5, ETG 2-1 - ETG 2-11, 2002
  • Svarc, J. L., J. C. Savage, W. H. Prescott, and M. H. Murray: Strain accumulation and rotation in western Oregon and southweatern Washington, J. G. R., 107, B5, ETG 1-1 - ETG 1-7, 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. G. R., 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. G. R., 106, 30607-30622, 2001
  • Gan, W. and W. H. Prescott: Crustal deformation rates in central and eastern U.S. inferred from GPS, Geophy. Res. Lett., 28, 3733-3736, 2001
  • Savage, J. C., J. L. Svarc, and W. H. Prescott: Strain accumulation near Yucca Mountain, Nevada, 1993-1998, J. G. R., 106, 16483-16488, 2001
  • Miyazaki, S. and K. Heki: Crustal velocity field of southwest Japan: subduction and arc-arc collision, J. G. R., 106, 4305-4326, 2001
  • Prescott, W. H., et al.: Deformation across the Pacific-North America plate boundary near San Francisco, California, J. G. R., 106, 6673-6682, 2001
  • Gan, W., et al.: Strain accumulation across the Eastern California Shear Zone at latitude 36 30', J. G. R., 105, 16229-16236, 2000
  • Hager, B. H., et al.: Reconciling rapid strain accumulation with deep seismogenic fault planes in the Ventura basin, California, J. G. R., 104, 25207-25219, 1999
  • Savage, J. C., et al.: Deformation across the forearc of the Cascadia subduction zone at Cape Blanco, Oregon, J. G. R., 105, 3095-3102, 2000
  • Shen, Z. K., et al.: Contemporary crustal deformation in east Asia constrained by Global Positioning System measurements, J. G. R., 105, 5721-5734, 2000


Created by Danan Dong and maintained by Da Kuang for
Geodynamics and Space Geodesy Group
email: dakuang@jpl.nasa.gov     tel:(818)354-8332
08/02/98