Poster #177, Fault and Rupture Mechanics (FARM)
The effects of Absolute Friction Level on Shallow Fault Dynamics
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Poster Presentation
2021 SCEC Annual Meeting, Poster #177, SCEC Contribution #11658 VIEW PDF
e there is a feedback between normal and shear stresses (e.g., Oglesby et al., 1998, Scala et al., 2018). In this study, we use dynamic rupture models to explain the role of absolute friction level in rupture behaviors, particularly in the shallow part of the crust where the Earth’s free surface may have a controlling role. Our results imply that when the thrust fault is buried deeply, the absolute friction and stress level have no influence on the final slip if the stress drop and S (strength excess divided by stress drop) are the same, as expected from full-space models from before. However, when the thrust fault ruptures up to near the free surface, the high absolute friction/stress model has a larger slip. The earthquake models we have may help in the interpretation of other dynamic earthquake simulations, as well as the slip in past and future real-world earthquakes.
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