Geodetic Earth Science Data Records: Consideration of the effects of the 2019 M 6.4 and M 7.1 Ridgecrest, California Earthquake Sequence on Plate Boundary Deformation

The Extended Solid Earth Science ESDR System (ESESES) project funded under the NASA MEaSUREs program produces and archives mature, long-term, calibrated and validated, GNSS based Earth Science Data Records (ESDRs) that encompass multiple diverse areas of interest in Earth Science, such as tectonic motion, transient slip and earthquake physics, as well as meteorology, climate, and hydrology. The ESDRs now span twenty-seven years for the earliest stations and today are available for thousands of global and regional stations.

Using a unified metadata database and a combination of GNSS solutions generated by two independent analysis centers at JPL (GIPSY) and SIO (GAMIT), the project produces ESDRs of relevance to plate motion and interseismic strain accumulation studies. Starting with the daily displacement time series and through a time series analysis, we estimate station velocities, coseismic offsets and postseismic motions for each station. We also produce weekly displacement and strain rate fields for select plate boundaries to identify tectonic, magmatic and other transients compared to published interseismic (secular) fault slip models, in both horizontal and vertical components. Vertical displacements recording solid Earth's elastic response are valuable for constraining change in total water at Earth's surface. Furthermore, we estimate high-rate (1-5 Hz) displacement waveforms and 100 Hz seismic velocity waveforms for collocated GNSS/seismic stations.

The July 4^thand 6^th2019 Mw 6.4 and Mw 7.1 Ridgecrest earthquakes caused significant (1- 800 mm) coseismic displacements at 15 and 100 GNSS stations, respectively. We describe and assess the displacement and strain rate fields in the years prior to and following the two events by about 5 months. In addition, we use the high-rate GNSS and seismogeodetic waveforms to identify the transition from coseismic to early onset postseismic deformation as input to kinematic fault slip models. Our analysis of these events demonstrate the need to distinguish transient deformation from secular tectonic motions in the study of plate boundary deformation and the earthquake cycle.