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Your search keyword '"Harvey, Tobias W."' showing total 5 results
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5 results on '"Harvey, Tobias W."'

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

Author

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, and Yang, Yuyun

Subjects
Earth Sciences, Engineering, Geophysics, Civil Engineering, Geochemistry & Geophysics, Civil engineering
Abstract

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.

Published
2023

2. A Non-stiff Summation-By-Parts Finite Difference Method for the Scalar Wave Equation in Second Order Form: Characteristic Boundary Conditions and Nonlinear Interfaces

Author

Erickson, Brittany A, Kozdon, Jeremy E, and Harvey, Tobias W

Subjects
Mathematics - Numerical Analysis
Abstract

Curvilinear, multiblock summation-by-parts finite difference operators with the simultaneous approximation term method provide a stable and accurate framework for solving the wave equation in second order form. That said, the standard method can become arbitrarily stiff when characteristic boundary conditions and nonlinear interface conditions are used. Here we propose a new technique that avoids this stiffness by using characteristic variables to "upwind" the boundary and interface treatment. This is done through the introduction of an additional block boundary displacement variable. Using a unified energy, which expresses both the standard as well as characteristic boundary and interface treatment, we show that the resulting scheme has semidiscrete energy stability for the scalar anisotropic wave equation. The theoretical stability results are confirmed with numerical experiments that also demonstrate the accuracy and robustness of the proposed scheme. The numerical results also show that the characteristic scheme has a time step restriction based on standard wave propagation considerations and not the boundary closure., Comment: 40 pages, 7 figures

Published
2021
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4. Incorporating Full Elastodynamic Effects and Dipping Fault Geometries in Community Code Verification Exercises for Simulations of Earthquake Sequences and Aseismic Slip (SEAS)

Author

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, 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, and Yang, Yuyun

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 undersco

Published
2023

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

Author

Tectonics, 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, Tectonics, 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, and Yang, Yuyun

Published
2023

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