CDDIS: NASA's Archive of Space Geodesy Data
CDDIS ESESES MEaSUREs products weekly coseismic offset time series

doi: 10.5067/GNSS/gnss_measures_coseismic_offsets_001

Data Center Citation

Noll, Carey E., The Crustal Dynamics Data Information System: A resource to support scientific analysis using space geodesy, Advances in Space Research, Volume 45, Issue 12, 15 June 2010, Pages 1421-1440, ISSN 0273-1177, http://dx.doi.org/10.1016/j.asr.2010.01.018.

Data Citation

ESESES MEaSUREs products weekly coseismic offset time series [online]. Available from the NASA Crustal Dynamics Data Information System DAAC, Greenbelt, MD, USA at: http://dx.doi.org/10.5067/GNSS/gnss_measures_coseismic_offsets_001, Accessed [[enter user data access date]].

Other standard citation formats may be used for this data set and can be found at the DOI Citation Formatter website.

More information about CDDIS data citations and acknowledgments is available.

Summary

  • Name: CDDIS ESESES MEaSUREs products weekly coseismic offset time series available from the Crustal Dynamics Data Information System (CDDIS)
  • Format: text file
  • Spatial Coverage: 90.0 to -90.0, 180.0 to -180.0
  • Temporal Coverage: 2022-01-25 - present
  • Temporal Resolution: Weekly
  • File Size: about 200 KB
  • Platforms: Multiple GNSS

Description*

Making Earth System Data Records for Use in Research Environments (MEaSUREs) empowers the research community to participate in developing and generating data products that complement and augment NASA produced and distributed Earth science data products. NASA's Enhanced Solid Earth Science Earth Science Data Record (ESDR) System (ESESES) continues and extends mature geodetic data product generation and archival as part of the MEaSUREs SESES project providing new, multi-decade, calibrated and validated geodetic-derived ESDRs obtained by the Scripps Institution of Oceanography (SIO) and Jet Propulsion Laboratory/California Institute of Technology (JPL/Caltech). These data-derived products include continuous multi-year high-rate GNSS, seismogeodetic, and meteorological time series, a catalog of transient deformation in tectonically active areas known for aseismic motion such as ETS with focus in Cascadia, and continuous estimation and cataloging of total near-surface water content derived from continuous GNSS time series over the continental U.S.

The weekly time series analysis includes estimate of offsets (jumps, discontinuities) that can be due to sudden coseismic motions or data artifacts due to (mostly) antenna model changes, metadata errors, changes in reference frames, or unknown sources. Furthermore, non-coseismic offsets are estimated and corrected in the various time series products, while the coseismic offsets are not corrected in order that the time series reflect only physical motions of the stations. A particular earthquake may cause significant coseismic offsets at hundreds of stations for the largest earthquakes. Non-coseismic offsets mostly correlate with changes in antenna models although not all antenna changes will result in a visible offset. There have been efforts to automatically detect offsets in displacement time series using various algorithms but these are not foolproof and some user interaction is required through the administrator interface. In order to reduce the number of offset parameters, current practice is to keep track of antenna changes and then determine visually if there is a significant offset to be estimated. Although, the IGS calibrates the absolute phase centers of all available geodetic-quality antennas, these are not perfect and may leave residual offsets in the displacement time series. Note that coseismic offsets may only be applied to horizontal components (N,E), or the vertical (V) component, while non-coseismic offsets are automatically applied to all three components. Also note, for daily displacement time series the offset is usually applied to the day after the recorded date if the antenna changed or earthquake occurred after 12:00 UTC.

* Reference: Bock, Y., Moore, A.W., Argus, D. F., Fang, P., Jiang, S., Kedar, S., Knox, S.A. Liu, Z. & Sullivan A. (2021), Extended Solid Earth Science ESDR System (ES3): Algorithm Theoretical Basis Document: Section 4.3 http://garner.ucsd.edu/pub/measuresESESES_products/ATBD/ESESES-ATBD.pdf (username:anonymous; password: your e-mail address)

Data Access

The CDDIS ESESES MEaSUREs products weekly coseismic offset time series are online:

Append the following filenames according to the table below

ESESES_CoseismicOffsets_YYYYMMDD.txt

Code Meaning
YYYY4-digit year
MM 2-digit month
DD 2-digit day

Documentation

http://cddis.nasa.gov/Data_and_Derived_Products/GNSS/MEaSUREs_products.html

See the ESESES Algorithm Theoretical Basis Document (ATBD) for detailed descriptions of the products: http://garner.ucsd.edu/pub/measuresESESES_products/ATBD/ESESES-ATBD.pdf