Joint Characterization of Transient Deformation and Repeating Earthquakes in California

Junle Jiang, & Taka'aki Taira

Submitted September 7, 2025, SCEC Contribution #14673, 2025 SCEC Annual Meeting Poster #TBD

Several fault segments in California are well known for their seismic and aseismic behaviors. The Parkfield segment of the San Andreas fault (SAF) features an abundance of transient aseismic phenomena and characteristically repeating earthquakes (CREs). The pre-, co-, and post-seismic phases of the 2004 Mw 6.0 Parkfield event are studied through seismograms, high-rate GNSS, strainmeter, creepmeters, etc. The spectrum of fault creep and seismicity extends along the Central SAF. Toward the south, fault creep or slow slip events are documented along the southernmost SAF and other faults in the Salton Trough. Despite increasing case studies, the relation between these transient aseismic faulting and coincident seismicity is complex in space and time, exhibiting highly variable styles across different settings. Here, we aim to characterize and understand the relation between transient fault deformation and CRE-derived in-situ fault slip and their geographic variability in several regions in California, including the Central SAF, Southern SAF, Superstition Hills Fault, and San Jacinto Fault. We compile and collate several datasets from the extensive geodetic networks in these areas, particularly strainmeters, creepmeters, and GNSS, due to their high temporal resolutions. We integrate geodetic and seismic data and jointly infer parametric forms of geodetic/CRE-based displacement histories. Our work is directed towards characterizing the temporal behavior of crustal transients and identifying the co-evolution patterns and variability of seismic-aseismic observations of crustal faults.

Key Words
geodetic transients, repeating earthquakes, crustal faults

Citation
Jiang, J., & Taira, T. (2025, 09). Joint Characterization of Transient Deformation and Repeating Earthquakes in California. Poster Presentation at 2025 SCEC Annual Meeting.

Related Projects & Working Groups
Stress and Deformation Over Time (SDOT)