A Novel Hybrid Finite Element-Spectral Boundary Integral Scheme for Modeling Earthquake Cycles: Application to Rate and State Faults With Low-Velocity Zones

Abdelmeguid, Mohamed; Ma, Xiao; Elbanna, Ahmed

doi:10.1029/2019jb018036

Title: A Novel Hybrid Finite Element-Spectral Boundary Integral Scheme for Modeling Earthquake Cycles: Application to Rate and State Faults With Low-Velocity Zones

Journal Article · Wed Dec 04 00:00:00 EST 2019 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1029/2019jb018036· OSTI ID:1799958

^[1]; Ma, Xiao ^[1]; Elbanna, Ahmed ^[1]

Univ. of Illinois at Urbana-Champaign, IL (United States)

Abstract We present a novel hybrid finite element‐spectral boundary integral (SBI) scheme that enables efficient simulation of earthquake cycles. This combined finite element‐SBI approach captures the benefits of finite elements in modeling problems with nonlinearities, as well as the computational superiority of SBI. The domain truncation enabled by this scheme allows us to utilize high‐resolution finite elements discretization to capture inhomogeneities or complexities that may exist in a narrow region surrounding the fault. Combined with an adaptive time stepping algorithm, this framework opens new opportunities for modeling earthquake cycles with high‐resolution fault zone physics. In this initial study, we consider a two‐dimensional antiplane model with a vertical strike‐slip fault governed by rate and state friction in the quasi‐dynamic limit under the radiation damping approximation. The proposed approach is first verified using the benchmark problem BP‐1 from the Southern California Earthquake Center sequence of earthquake and aseismic slip community verification effort. The computational framework is then utilized to model the earthquake sequence and aseismic slip of a fault embedded within a low‐velocity fault zone (LVFZ) with different widths and compliance levels. Our results indicate that sufficiently compliant LVFZs contribute to the emergence of subsurface events that fail to penetrate to the free surface and may experience earthquake clusters with nonuniform interseismic time. Furthermore, the LVFZ leads to slip rate amplification relative to the homogeneous elastic case. We discuss the implications of our results for understanding earthquake complexity as an interplay of fault friction and bulk heterogeneities.

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Research Organization:: Univ. of Illinois at Urbana-Champaign, IL (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0031685

OSTI ID:: 1799958

Alternate ID(s):: OSTI ID: 1577205

Journal Information:: Journal of Geophysical Research. Solid Earth, Vol. 124, Issue 12; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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