Abstract
Previous studies have shown that plastic yielding in crustal rocks in the fault zone may impose a physical limit to extreme ground motions. We explore the effects of fault-zone nonlinearity on peak ground velocities (PGVs) by simulating a suite of surface-rupturing strike-slip earthquakes in a medium governed by Drucker–Prager plasticity using the AWP-ODC finite-difference code. Our simulations cover magnitudes ranging from 6.5 to 8.0, three different rock strength models, and average stress drops of 3.5 and 7.0 MPa, with a maximum frequency of 1 Hz and a minimum shear-wave velocity of 500 m/s. Friction angles and cohesions in our rock models are based on strength criteria which are frequently used for fractured rock masses in civil and mining engineering. For an average stress drop of 3.5 MPa, plastic yielding reduces nearfault PGVs by 15–30% in pre-fractured, low strength rock, but less than 1% in massive, high-quality rock. These reductions are almost insensitive to magnitude. If the stress drop is doubled, plasticity reduces near-fault PGVs by 38–45% and 5–15% in rocks of low and high strength, respectively. Because non-linearity reduces slip rates and static slip near the surface, plasticity acts in addition to, and may partially be emulated by, a shallow velocity-strengthening layer. The effects of plasticity are exacerbated if a fault damage zone with reduced shear-wave velocities and reduced rock strength is present. In the linear case, fault-zone trapped waves result in higher near-surface peak slip rates and ground velocities compared to simulations without a low-velocity zone. These amplifications are balanced out by fault-zone plasticity if rocks in the damage zone exhibit low-to-moderate strength throughout the depth extent of the low-velocity zone (~5 km). We also perform dynamic nonlinear simulations of a high stress drop (8 MPa) M 7.8 earthquake rupturing the southern San Andreas fault along 250 km from Indio to Lake Hughes. Non-linearity in the fault damage zone and in near-surface deposits would reduce peak ground velocities in the Los Angeles basin by 15–50%, depending on the strength of crustal rocks and shallow sediments. These results show that non-linear effects may be relevant even at long periods, in particular in earthquakes with high stress drop and in the presence of a lowvelocity fault damage zone.
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Acknowledgements
Computations were performed on Blue Waters at NCSA, using resources provided through the PRAC (Petascale Computing Resource Allocation) program, and on Titan, which is part of the Oak Ridge Leadership Facility at the Oak Ridge National Laboratory supported by DOE Contract No. DEAC05- 00OR22725. This research was supported by SCEC through by NSF Cooperative Agreement EAR- 0529922 and USGS Cooperative Agreement 07HQAG0008, by USGS award G15AP00077, andby NSF awards EAR-1226343, OCI-114849, OCI- 1450451, and EAR-1135455. We used the PyNGA package for Python by Feng Wang to compute spectral accelerations predicted by the two GMPEs. The authors thank two anonymous reviewers and the guest editor for valuable suggestions that helped to improve the manuscript.
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Roten, D., Olsen, K.B., Day, S.M., Cui, Y. (2018). Quantification of Fault-Zone Plasticity Effects with Spontaneous Rupture Simulations. In: Dalguer, L., Fukushima, Y., Irikura, K., Wu, C. (eds) Best Practices in Physics-based Fault Rupture Models for Seismic Hazard Assessment of Nuclear Installations. Pageoph Topical Volumes. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-72709-7_5
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