Incorporating Full Elastodynamic Effects and Dipping Fault Geometries in Community Code Verification Exercises for Simulations of Earthquake Sequences and Aseismic Slip (SEAS)

Erickson, Brittany A.; Jiang, Junle; Lambert, Valère; Barbot, Sylvain D.; Abdelmeguid, Mohamed; Almquist, Martin; Ampuero, Jean-Paul; Ando, Ryosuke; Cattania, Camilla; Chen, Alexandre; Dal Zilio, Luca; Deng, Shuai; Dunham, Eric M.; Elbanna, Ahmed E.; Gabriel, Alice-Agnes; Harvey, Tobias W.; Huang, Yihe; Kaneko, Yoshihiro; Kozdon, Jeremy E.; Lapusta, Nadia; Li, Duo; Li, Meng; Liang, Chao; Liu, Yajing; Ozawa, So; Perez-Silva, Andrea; Pranger, Casper; Segall, Paul; Sun, Yudong; Thakur, Prithvi; Uphoff, Carsten; van Dinther, Ylona; Yang, Yuyun

doi:10.1785/0120220066

Incorporating Full Elastodynamic Effects and Dipping Fault Geometries in Community Code Verification Exercises for Simulations of Earthquake Sequences and Aseismic Slip (SEAS)

Journal Article · 09 January 2023 · Bulletin of the Seismological Society of America

DOI:https://doi.org/10.1785/0120220066· OSTI ID:2418174

^[1]; ; ; ; ; ; ; ; ; Chen, Alexandre; ; Deng, Shuai; ; Elbanna, Ahmed E.; ; Harvey, Tobias W.; ; ; ; more »

OSTI

ABSTRACT

Numerical modeling of earthquake dynamics and derived insight for seismic hazard relies on credible, reproducible model results. The sequences of earthquakes and aseismic slip (SEAS) initiative has set out to facilitate community code comparisons, and verify and advance the next generation of physics-based earthquake models that reproduce all phases of the seismic cycle. With the goal of advancing SEAS models to robustly incorporate physical and geometrical complexities, here we present code comparison results from two new benchmark problems: BP1-FD considers full elastodynamic effects, and BP3-QD considers dipping fault geometries. Seven and eight modeling groups participated in BP1-FD and BP3-QD, respectively, allowing us to explore these physical ingredients across multiple codes and better understand associated numerical considerations. With new comparison metrics, we find that numerical resolution and computational domain size are critical parameters to obtain matching results. Codes for BP1-FD implement different criteria for switching between quasi-static and dynamic solvers, which require tuning to obtain matching results. In BP3-QD, proper remote boundary conditions consistent with specified rigid body translation are required to obtain matching surface displacements. With these numerical and mathematical issues resolved, we obtain excellent quantitative agreements among codes in earthquake interevent times, event moments, and coseismic slip, with reasonable agreements made in peak slip rates and rupture arrival time. We find that including full inertial effects generates events with larger slip rates and rupture speeds compared to the quasi-dynamic counterpart. For BP3-QD, both dip angle and sense of motion (thrust versus normal faulting) alter ground motion on the hanging and foot walls, and influence event patterns, with some sequences exhibiting similar-size characteristic earthquakes, and others exhibiting different-size events. These findings underscore the importance of considering full elastodynamics and nonvertical dip angles in SEAS models, as both influence short- and long-term earthquake behavior and are relevant to seismic hazard.

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

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

DOE Contract Number:: FE0031685

OSTI ID:: 2418174

Journal Information:: Bulletin of the Seismological Society of America, Journal Name: Bulletin of the Seismological Society of America Journal Issue: 2 Vol. 113; ISSN 0037-1106

Publisher:: Seismological Society of America

Country of Publication:: United States

Language:: English

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