geodesy.unr.eduNevada Geodetic Laboratory - Home

| Home | People | Contact || Vacancies | News Archive | MAGNET | Acknowledgements | Recent Research Great Basin Strain Basin and Range Dynamics Aquifer Deformation Geothermal Energy Global Tectonics Reference Frames Global Strain Rate Map Yucca Mountain GPS Vertical Land Motion Publications MAGNET GPS Network Network Information and Data People Geoff Blewitt Bill Hammond Corné Kreemer Bret Pecoraro Justine Overacker Aren Crandall-Bear Nina Miller Past Members Zack Young Meredith Kraner Hans-Peter Plag Elliot Klein Jayne Bormann Jay Goldfarb Yang Zhang Sumant Jha Emma Hill Link to our Data Products Page: The Plug and Play Portal with Lists of all data products Quick Links to Data Products: Map Browse GPS Stations All Stations Processed MAGNET GPS network Direct link to MAGNET RINEX data Publications Guide to QA Files GPS Data Processing Strategy Citation of Data Products Henceforth please use the following for citation of our data products: Blewitt, G., W. C. Hammond, and C. Kreemer (2018), Harnessing the GPS data explosion for interdisciplinary science, Eos, 99, https://doi.org/10.1029/2018EO104623. Please also note that many stations have an original data citation that should also be referenced. When possible we have provided links to the original data dois on our station pages. Troposphere Products Link to directory with all troposphere files. README file explaining troposphere files. Link to IGS SINEX format description. Browse Lists of Stations All Stations Processed Stations with rapid 5 minute sample rate solutions (latency 24 hours) Stations with ultra rapid 5 minute sample rate solutions (latency 1.5 hours) Above lists have links to station pages. MIDAS Velocity Fields In IGS14 Reference Frame Plate Reference Frames: AF - Africa AN - Antarctica AR - Arabia AU - Australia BU - Burma CA - Caribbean CO - Cocos EU - Eurasian IN - Indian MA - Mariana NA - North America NB - North Bismark NZ - Nazca OK - Okhotsk ON - Okinawa PA - Pacific PM - Panama PS - Philippine Sea SA - South America SB - South Bismark SC - Scotia SL - Shetland SO - Somalia SU - Sunda WL - Woodlark The plates frames are defined using Euler rotation poles found in the supplement of Kreemer et al., 2014 . The table is also separately available at this link. The format of the file is latitude(deg), longitude(deg), magnitude (deg/Myr), plate ID. To be entirely consisent with the assumed kinematic model, plate velocity at any latitude and longitude can then be computed using the formulas (B1) and (B2) in Kreemer et al., 2014, where Earth’s radius R = 6371 km. Each station is associated with one or more tectonic plates, as defined by Bird, 2002 . Every station is on at least one plate, but some stations can have more than one plate associated with them if the second plate is close. For every station there is at least one large plate in the set assigned to it (the large plates being PA, NA, SA, EU, AF, AN, AU). A text file that lists the plates associated with each station is available HERE . MIDAS rates in legacy reference frames: In NA12 Reference Frame In IGS08 Reference Frame More Information: MIDAS velocity file format README Download the MIDAS code and examples MIDAS software release notes Vertical Land Motion (VLM) Using GPS Imaging: Global VLM page, with focus on tide gauges File with GPS constraints at tide gagues (text) Downloadable Lists of GPS Data Holdings: Download list of GPS station latitude, longitude, and heights Download list of GPS stations sorted (in reverse order) by date added to NGL system (yyyy_ddd) Stations with 24 hour sample rate solutions, final orbits, 2 week latency. Stations with 24 hour sample rate solutions, rapid orbits, 24 hour latency. Stations with 5 minute sample rate solutions, rapid orbits, 24 hour latency. Stations with 5 minute sample rate solutions, ultra rapid orbints, 1.5 hour latency. The linked text files above are updated daily and include: Station Name, Latitude, Longitude, Height, XYZ coordinates, data begin and end dates, number of solutions and station operator original site name. Database of Potential Step Discontinuities Link to master steps database. README for steps database. Decimal Year Convention: Explanation and translation file Monuments For about half of all GPS stations processed at NGL we have been able to extract and tabulate information about the station monuments from the IGS log files. This information includes description of the monument, its foundation construction, height, depth, and geologic enviroment when available. This information can be used to assess the factors contributing to station stability, error checking and tracking down issues in the time series, studies of noise characteristics, etc. This information is now posted in the: Monument Table Loading Predictions We now provide displacement predictions from models of geophysical surface loading. Three-component displacement predictions from non-tidal atmospheric, non-tidal ocean, hydrological model, and GRACE mascon-based equivalent water height, and reservoirs within the continentnal united states are included for all days for which we provide 24 hour solutions. The data are provided as east, north, up triplets concatenated to the end of lines in our .tenv3 files. The new files with the appended triplets can be found linked from every station page and also en masse at this link. See this Readme File for an explanation of the columns in the extended .tenv3 files. Plots of the predictions for vertical motions are also available via a tab on the station pages next to the time series plots, or for all stations in this directory. System Status Notes (1) Rapid solutions may be degraded starting 2022-11-28 owing to a change in Rapid orbit and clock models from JPL which are now in the IERS 2010/ITRF2020 framework. This causes a slight mismatch with current NGL processing models which will be rectified in mid-2023. Final products are unaffected and remain in the IERS 2010/ITRF2014 framework. (2) We expect that in 2023 JPL will have computed new Final orbits and clocks, and at that time we will undertake complete reprocessing of Final products in the IERS 2020/ITRF2020 framework. New NGL Final products will then be computed and are expected to be complete by early 2024. (3) An issue with downloading data from the EarthScope portal is causing problems with recent solutions from some of the Network of the Americas (NOTA) stations. The remedy requires anImportantly, the files can reveal when equipment performance is degrading, or external factors effect the results of processing. Thus the QA parameters can be used to track down errors, problems, and/or equipment issues with the GPS station. The tab for the QA plot is the last tab listed for the time series plots on each station page. The guide to the QA files describes the parameters and how they can reveal factors that influence processing results. [January 21, 2021] - MAGNET featured in Bloomberg Video NBMG Director Jim Faulds appears in a fun Bloomberg story about Highway 395, Tesla and the Walker Lane. Starting around 3:00 he discusses the MAGNET Network’s role in measuring the faults and deformation in the Walker Lane. Check it out: [January 9, 2021] - New Paper on Common-mode Filtering There is a new paper from Corné Kreemer and Geoff Blewitt from NGL on reducing scatter in geodetic time-series. ⁦ The paper presents a method that removes more noise than any other previous common-mode “filtering” technique. The secret is to define “common” as local as possible, and use all stations. The paper is available at the Journal of Geodesy. The example below-right is a MIDAS velocity time-series for station KIN1 using 2.5-year periods centered on a moving window for every 0.2 years. Red/blue lines and outline are velocity and one standard deviation for unfiltered and filtered time-series, respectively. Velocities are plotted relative to long-term trend and, for reference, the dashed and dotted lines...