Welcome to the Scripps Orbit and Permanent Array Center

Continuous GPS station (SIO3) part of Permanent GPS Geodetic Array (PGGA) in southern California, 1993

Researching, analyzing and archiving high-precision geodetic and seismic data for the study of earthquake and tsunami hazards, tectonic plate motion, crustal deformation and structural monitoring

Scripps Institution of Oceanography's Orbit and Permanent Array Center (SOPAC) has served a large community of users, starting in 1991, with a focus on the analysis and archiving of precise GPS data/metadata and data products.  Today, SOPAC also refers to our research group, using geodetic and seismic data for a wide range of projects in geodesy, geophysics, surveying and engineering.

Current SOPAC News

Currently, SOPAC provides several community services:

  • SOPAC GARNER archive of GNSS, seismic and meteorological data/metadata and data products (username: anonymous; password: your e-mail address)
  • International GNSS Service Global Data and Analysis Center, since the inception of the IGS.
  • California Spatial Reference Center (CSRC)
  • California Real Time Network (CRTN)


SOPAC maintains an Oracle 12 database that supports user access via web services and APIs, such as SCOUT (an ITRF coordinates generator from RINEX data), Site Information Manager (SIM – GNSS metadata), SECTOR (utility to access epoch-date coordinates for reference stations), and a utility to check for unused 4-character GNSS site codes.

SOPAC also maintains the GPS Explorer data portal for the NASA MEaSUREs “Solid Earth Science Data Records (SESES)” project in collaboration with the Jet Propulsion Laboratory in Pasadena, California.

Data and data products from the SOPAC GARNER archive may be retrieved via ftp://garner.ucsd.edu and http://garner.ucsd.edu (username: anonymous; password: your e-mail address). Frequently used directories include: combinations, gamit, hfiles, met, ppp, products, rinex, rinex_highrate, timeseries. Archive metrics are provided in several categories and formats.

Please acknowledge usage of SOPAC data and/or data products in your publications, applications and products. Access to the SOPAC archive is intended for non-commercial users but there are no user fees and there is significant usage by the private sector.

Seismogeodetic station on Mt. Soledad in La Jolla, California operated by SOPAC

Scientists in Charge:

Yehuda Bock, Director
Peng Fang, Assistant Director
Rooms 4208, 4108
8785 Biological Grade
Institute of Geophysics and Planetary Physics
Scripps Institution of Oceanography
La Jolla, CA 92093-0225
Tel: (858) 534-5292, (858) 534-2445
E-mail: ybock-at-ucsd.edu; pfang-at-ucsd.edu

Click here for the full personnel list.


  • Klein, K., Y. Bock, X. Xu, D. Sandwell, D. Golriz, P. Fang, L. Su (2019), Transient deformation in California from two decades of GPS displacements: Implications for a three-dimensional dynamic reference frame, J. Geophys. Res., DOI:10.1029/2018JB017201.
  • Goldberg, D. E., D. Melgar, Y. Bock, R. M. Allen (2018), Geodetic Observations of Weak Determinism in Rupture Evolution of Large Earthquakes, J. Geophys. Res., 123. https://doi.org/10.1029/2018JB015962.
  • Now available on September 24, 2018: High-rate GNSS displacement waveforms for large earthquakes version 2.0 (Download)
  • Ruhl, C. et al. (2018), A Global Database of Strong Motion Displacement GNSS Recordings and an Example Application to PGD Scaling, Seismo. Res. Lett., https://doi.org/10.1785/0220180177
  • Congratulations to Dara Goldberg who successfully defended her PhD thesis, "Seismogeodetic Methods for Earthquake and Tsunami Warning and Response," on October 11, 2018.
  • SOPAC awarded a 5-year project in collaboration with JPL (2018): “Extended Solid Earth Science ESDR system (ESESES)” funded by NASA MEaSUREs program. ESDRs are long-term “Earth Science Data Records” that are archived at SOPAC and CDDIS.
  • Watanabe, S., Y. Bock, D. Melgar, and K. Tadokoro (2018), Tsunami scenarios based on interseismic models along the Nankai Trough, Japan from seafloor and onshore geodesy, J. Geophys. Res. Solid Earth, 123(3), 2448-2461. https://doi.org/10.1002/2017JB014799.
  • Goldberg, D., Y. Bock (2017), Self-contained local broadband seismogeodetic early warning system: Detection and location, J. Geophys. Res. Solid Earth, 122, 1–24, doi:10.1002/2016JB013766.
  • Bock, Y. and D. Melgar (2016), Physical Applications of GPS Geodesy: A Review, Rep. Prog. Phys. 79, 10, doi:10.1088/0034-4885/79/10/106801.

Earthquake info in GPS Explorer

In Memoriam: John Canas (October 5, 2021)

SOPAC/CSRC Director gave presentation "Using GNSS and InSAR to Maintain a Dynamic Vertical Datum" at 61st Meeting of the Civil GPS Service Interface Committee, September 21, 2021

SOPAC/CSRC awarded Caltrans contract to study dynamic geodetic datums (2020-2021)

Update August 30, 2019: July 4,6 2019 Ridgecrest earthquakes

Coseismic offsets (corrected 11/4/2019)

Epoch 2019.55 coordinates for affected stations

SOPAC computed coseismic offsets using the GAMIT/GLOBK software with 30s data from 109 continuous GNSS stations within a radius of 160 km from the epicentral region.

click here to learn more.