Investigating tremor sources along the San Andreas Fault using integrated static and dynamic stress models

Hector Gonzalez-Huizar, Sandra Hardy, & Bridget Smith-Konter

Published August 3, 2016, SCEC Contribution #6483, 2016 SCEC Annual Meeting Poster #179

Ambient and triggered tectonic tremors have been reported near the creeping to locking transition zone along the Parkfield-Cholame section of the San Andreas Fault, as well as in the San Jacinto and Calaveras Faults. Tremors dynamically triggered by seismic waves can be useful in the estimation of the friction and stress conditions at aseismic depths. These are important parameters in computing stress transfer from plate motion to the seismogenetic zones, and thus, in creating seismic hazard models. We use recorded seismic signal from large earthquakes to calculate the dynamic stresses capable to trigger tremor in these regions. Then, dynamics stresses are integrated with local tectonic stress models with the objective to estimate the spatial variability of frictional and stress parameters along the areas where tremors are triggered. Integrating static and dynamic stress along the San Andreas Fault allows us to better understand the physical conditions necessary for tremor occurrence.

Key Words
Tremor, dynamic triggering, static stress

Citation
Gonzalez-Huizar, H., Hardy, S., & Smith-Konter, B. (2016, 08). Investigating tremor sources along the San Andreas Fault using integrated static and dynamic stress models . Poster Presentation at 2016 SCEC Annual Meeting.

Related Projects & Working Groups
Seismology