Geodetic Data, Data Products and Displacement Time Series Portal

Yehuda Bock, Angelyn W. Moore, Peng Fang, Dorian Golriz, Donald F. Argus, Zhen Liu, Katherine A. Guns, Xiaohua Xu, David T. Sandwell, Anne Sullivan, Songnian Jiang, & Alistair Knox

Published August 16, 2021, SCEC Contribution #11552, 2021 SCEC Annual Meeting Poster #097

Our NASA MEaSUREs project “Extended Solid Earth Science ESDR System” (ES3) is a long-lived collaboration of JPL and SIO. Using independent software packages, GipsyX Network Processor and GAMIT/GLOBK and a common source metadata at SOPAC to process GNSS data, we provide four levels of products beginning with level 1 raw daily displacement time series. Station motions are due to crustal deformation (interseismic), earthquakes (coseismic and postseismic), volcanism, transients (e.g., episodic tremor and slip - ETS) as well as other natural (e.g., subsidence due to drought) and anthropogenic processes (e.g., water and oil extraction). The second level of products includes calibrated and validated displacement time series resulting from a rigorous quality control process. For example, we produce a daily displacement time series that has been corrected for artifacts and outliers; this and a series with the artifacts intact are made available to the SCEC community geodetic model. Several sets of time series and their metadata superimposed on a map interface can be viewed at our new MGViz interactive data portal (http://geoapp20.ucsd.edu/?mission=ESESES). The third level of products includes parameters estimated through a time series analysis, coseismic offsets, postseismic decay, interseismic velocities, vertical displacements and residuals, as well as weekly displacements grids reflecting both steady-state and transient motions. The final level of products for the Western U.S includes strain rate grids, modeled ETS transients and total surface water storage for hydro-geodetic research. In parallel to this four-level structure, we provide high-rate seismogeodetic displacements for a catalogue of historic earthquakes useful in developing real-time earthquake and tsunami early warning systems and studying physical processes such as defining the coseismic phase of the crustal deformation cycle as it transitions into early postseismic deformation. Finally, we provide a 5-minute record of tropospheric total delay and atmospheric precipitable water for tracking and better understanding extreme weather such as monsoons and atmospheric rivers and their hazards, for example, to forecast flash flooding. The products are available through NASA’s CDDIS and SOPAC archives. In collaboration with David Sandwell’s InSAR group, we are in the process of integrating our weekly displacement grids and 5-minute troposphere delays with 6–12-day Sentinal-1 interferograms.

Key Words
GNSS Products, Displacement and Strain Fields, GNSS/InSAR Integration, Crustal Motions

Citation
Bock, Y., Moore, A. W., Fang, P., Golriz, D., Argus, D. F., Liu, Z., Guns, K. A., Xu, X., Sandwell, D. T., Sullivan, A., Jiang, S., & Knox, A. (2021, 08). Geodetic Data, Data Products and Displacement Time Series Portal. Poster Presentation at 2021 SCEC Annual Meeting.

Related Projects & Working Groups
Tectonic Geodesy