The Scripps Orbit and Permanent Array Center (SOPAC) is located at the
Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics
(IGPP), Scripps Institution of Oceanography
(SIO), University of California, San Diego (UCSD) in La Jolla, California.
SOPAC's primary role is to research and support high precision geodetic and geophysical measurements using Global Navigation Satellite Systems (GNNS),
such as GPS, particularly for the study of earthquake hazards, tectonic plate motion, plate boundary deformation and, meteorology.
We conduct research on local earthquake and tsunami warning systems using real-time seismogeodetic methods, the optimal combination of GPS and
seismic data, developed by SOPAC researchers. We design, manufacture and deploy seismogeodetic instrumentation in California, in cooperation with
UNAVCO/PBO. The “GAP” instrumentation includes the SIO Geodetic Module that controls an external GNSS receiver, the SIO MEMS Accelerometer Package
and the SIO MEMS Meteorological Package.
SOPAC serves as a Global Data Center and a Global Analysis Center for the International GNSS Service
(IGS), since its inception. SOPAC maintains a data archive of thousands of GNSS regional and global
GNSS stations, and data products.
SOPAC is the operations center for the California Spatial Reference Center
(CSRC), which provides California's geodetic framework for scientific, surveying, engineering, and geographical information systems. We operate the California Real Time Network (CRTN)
for the CSRC, serving GNSS data streams in real time to more than 800 users. SOPAC also maintains a clearinghouse of real-time high-rate GNSS data from more than 600 stations in the western U.S. The Real-time Earthquake Analysis for Disaster
Mitigation Network (READI) project, includes real-time data from servers at UNAVCO/PBO, UC Berkeley (BARD), Central Washington Univ. (PANGA), and the U.S. Geological Survey. We are responsible for 22 real-time GNSS stations in southern
Many APIs are available from the SOPAC web site,
such as SCOUT (an ITRF coordinates generator from RINEX data,
Site Information Manager (SIM), and SECTOR (utility to access epoch-date coordinates for reference stations), and a utility to check for
unused 4-character site codes. SOPAC maintains an Oracle 12 database supporting user access via web services and APIs.
SOPAC also maintains the GPS Explorer data portal for our NASA MEaSUREs “Solid Earth Science Data Records (SESES)” project.
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
Scientists in Charge:
Yehuda Bock, Director
Room 4208, 4108
8785 Biological Grade
Institute of Geophysics and Planetary Physics
Scripps Institution of Oceanography
La Jolla, CA 92037
Tel: (858) 534-5292, (858) 534-2445