Welcome to the SOPAC, CSRC and MEaSUREs website

The Scripps Orbit and Permanent Array Center (SOPAC) has redesigned its web pages (formerly http://sopac.ucsd.edu) and merged them with the redesigned California Spatial Reference Center (CSRC) Web pages (formerly http://csrc.ucsd.edu). New to this collection is MEaSUREs (Making Earth System Data Records for Use in Research Environments), a collaborative NASA program with the Jet Propulsion Laboratory (JPL).

News 12/20/2022 10:34:24 UTC: Minimal effect on coordinates for M6.4 Ferndale earthquake, N26.43123,W140.09766; 17.9W km depth.  The earthquake caused a minimal shift in coordinates - maximum horizontal offset of 0.066 ft (2 cm) at station P161, less than 1 cm at other stations in the epicentral region. No detectable vertical motions.

The three entry points under a single unified Web structure:

SOPAC homepage

CSRC homepage MEaSUREs homepage


We have organized the Web pages horizontally as a series of main headers, each linked to a series of vertical subheaders.

Information specific to each of the centers is located under the main headers “SOPAC”,  “CSRC” and "MEaSUREs."

The SOPAC data archive is common to all programs so we’ve created a single main header “Data Archive.” Similarly, all applications are organized under one main header “Applications.”

We’ve created a single main header, “CRTN” for the California Real Time Network.

The “Maps” main header contains a new Google maps interface for the California Spatial Reference Network (CSRN), and for CRTN. It also contains access to our legacy map pages accessed through GPS Explorer.

The main header “Contact Us” reflects the overlap of SOPAC and CSRC personnel and indicates the primary contacts for each center and individual.

Movie below shows solar panel upgrades at Modjeska peak, a primary communications hub for the Orange County stations of CRTN (courtesy Art Andrew, Orange County Public Works).


In Memoriam: John Canas

CSRC Strategic Plan/Decade 3 published (2021-08-31)


June 16: The CSRC 2017.50 map is now accessible via QR code. Use the QR code below. (If needed, instructions are available here.)

Paper published on early postseismic deformation in Science Advances (2021), Jiang, Bock & Klein

Bock & Wdowinski GNSS review paper: IEEE, 2021, 741-820, doi: 10.1002/9781119458449.ch28.

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 98 continuous GNSS stations that experienced total displacements greater than 3 mm.

click here to learn more.