Martin Almquist

Adjoint-based inversion for stress and frictional parameters in earthquake modeling

Stiernström, Vidar; Almquist, Martin; Dunham, Eric M.

Part of Journal of Computational Physics, 2024

• DOI for Adjoint-based inversion for stress and frictional parameters in earthquake modeling
• Download full text (pdf) of Adjoint-based inversion for stress and frictional parameters in earthquake modeling

Simulation of flexural-gravity wave propagation for elastic plates in shallow water using an energy-stable finite difference method with weakly enforced boundary and interface conditions

Tazhimbetov, Nurbek; Almquist, Martin; Werpers, Jonatan; Dunham, Eric M.

Part of Journal of Computational Physics, 2023

• DOI for Simulation of flexural-gravity wave propagation for elastic plates in shallow water using an energy-stable finite difference method with weakly enforced boundary and interface conditions

Modeling and inversion in acoustic-elastic coupled media using energy-stable summation-by-parts operators

Bader, Milad; Almquist, Martin; Dunham, Eric M.

Part of Geophysics, 2023

• DOI for Modeling and inversion in acoustic-elastic coupled media using energy-stable summation-by-parts operators

Boundary-optimized summation-by-parts operators for finite difference approximations of second derivatives with variable coefficients

Stiernström, Vidar; Almquist, Martin; Mattsson, Ken

Part of Journal of Computational Physics, 2023

• DOI for Boundary-optimized summation-by-parts operators for finite difference approximations of second derivatives with variable coefficients
• Download full text (pdf) of Boundary-optimized summation-by-parts operators for finite difference approximations of second derivatives with variable coefficients

Ultra and Very Long Period Seismic Signatures of Unsteady Eruptions Predicted From Conduit Flow Models

Coppess, Katherine R.; Dunham, Eric M.; Almquist, Martin

Part of Journal of Geophysical Research - Solid Earth, 2022

• DOI for Ultra and Very Long Period Seismic Signatures of Unsteady Eruptions Predicted From Conduit Flow Models
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Elastic wave propagation in anisotropic solids using energy-stable finite differences with weakly enforced boundary and interface conditions

Almquist, Martin; Dunham, Eric M.

Part of Journal of Computational Physics, 2021

• DOI for Elastic wave propagation in anisotropic solids using energy-stable finite differences with weakly enforced boundary and interface conditions

Non-stiff boundary and interface penalties for narrow-stencil finite difference approximations of the Laplacian on curvilinear multiblock grids

Almquist, Martin; Dunham, Eric M.

Part of Journal of Computational Physics, 2020

• DOI for Non-stiff boundary and interface penalties for narrow-stencil finite difference approximations of the Laplacian on curvilinear multiblock grids

Order-preserving interpolation for summation-by-parts operators at nonconforming grid interfaces

Almquist, Martin; Wang, Siyang; Werpers, Jonatan

Part of SIAM Journal on Scientific Computing, 2019

• DOI for Order-preserving interpolation for summation-by-parts operators at nonconforming grid interfaces

Poroelastic effects destabilize mildly rate-strengthening friction to generate stable slow slip pulses

Heimisson, Elias R.; Dunham, Eric M.; Almquist, Martin

Part of Journal of the mechanics and physics of solids, p. 262-279, 2019

• DOI for Poroelastic effects destabilize mildly rate-strengthening friction to generate stable slow slip pulses

Multilevel local time-stepping methods of Runge–Kutta-type for wave equations

Almquist, Martin; Mehlin, Michaela

Part of SIAM Journal on Scientific Computing, 2017

• DOI for Multilevel local time-stepping methods of Runge–Kutta-type for wave equations

High-fidelity numerical solution of the time-dependent Dirac equation

Almquist, Martin; Mattsson, Ken; Edvinsson, Tomas

Part of Journal of Computational Physics, p. 86-103, 2014

• DOI for High-fidelity numerical solution of the time-dependent Dirac equation

Optimal diagonal-norm SBP operators

Mattsson, Ken; Almquist, Martin; Carpenter, Mark H.

Part of Journal of Computational Physics, p. 91-111, 2014

• DOI for Optimal diagonal-norm SBP operators

Approximating Moving Point Sources in Hyperbolic Partial Differential Equations

Ljungberg Rydin, Ylva; Almquist, Martin

Part of Journal of Scientific Computing, 2025

• DOI for Approximating Moving Point Sources in Hyperbolic Partial Differential Equations
• Download full text (pdf) of Approximating Moving Point Sources in Hyperbolic Partial Differential Equations

Adjoint-based inversion for stress and frictional parameters in earthquake modeling

Stiernström, Vidar; Almquist, Martin; Dunham, Eric M.

Part of Journal of Computational Physics, 2024

• DOI for Adjoint-based inversion for stress and frictional parameters in earthquake modeling
• Download full text (pdf) of Adjoint-based inversion for stress and frictional parameters in earthquake modeling

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, Valere; Barbot, Sylvain D. et al.

Part of Bulletin of The Seismological Society of America (BSSA), p. 499-523, 2023

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

Simulation of flexural-gravity wave propagation for elastic plates in shallow water using an energy-stable finite difference method with weakly enforced boundary and interface conditions

Tazhimbetov, Nurbek; Almquist, Martin; Werpers, Jonatan; Dunham, Eric M.

Part of Journal of Computational Physics, 2023

• DOI for Simulation of flexural-gravity wave propagation for elastic plates in shallow water using an energy-stable finite difference method with weakly enforced boundary and interface conditions

Modeling and inversion in acoustic-elastic coupled media using energy-stable summation-by-parts operators

Bader, Milad; Almquist, Martin; Dunham, Eric M.

Part of Geophysics, 2023

• DOI for Modeling and inversion in acoustic-elastic coupled media using energy-stable summation-by-parts operators

Approximating Moving Point Sources in Hyperbolic Partial Differential Equations

Ljungberg Rydin, Ylva; Almquist, Martin

Part of Journal of Scientific Computing, 2025

• DOI for Approximating Moving Point Sources in Hyperbolic Partial Differential Equations
• Download full text (pdf) of Approximating Moving Point Sources in Hyperbolic Partial Differential Equations

Adjoint-based inversion for stress and frictional parameters in earthquake modeling

Stiernström, Vidar; Almquist, Martin; Dunham, Eric M.

Part of Journal of Computational Physics, 2024

• DOI for Adjoint-based inversion for stress and frictional parameters in earthquake modeling
• Download full text (pdf) of Adjoint-based inversion for stress and frictional parameters in earthquake modeling

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, Valere; Barbot, Sylvain D. et al.

Part of Bulletin of The Seismological Society of America (BSSA), p. 499-523, 2023

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

Simulation of flexural-gravity wave propagation for elastic plates in shallow water using an energy-stable finite difference method with weakly enforced boundary and interface conditions

Tazhimbetov, Nurbek; Almquist, Martin; Werpers, Jonatan; Dunham, Eric M.

Part of Journal of Computational Physics, 2023

• DOI for Simulation of flexural-gravity wave propagation for elastic plates in shallow water using an energy-stable finite difference method with weakly enforced boundary and interface conditions

Modeling and inversion in acoustic-elastic coupled media using energy-stable summation-by-parts operators

Bader, Milad; Almquist, Martin; Dunham, Eric M.

Part of Geophysics, 2023

• DOI for Modeling and inversion in acoustic-elastic coupled media using energy-stable summation-by-parts operators

Boundary-optimized summation-by-parts operators for finite difference approximations of second derivatives with variable coefficients

Stiernström, Vidar; Almquist, Martin; Mattsson, Ken

Part of Journal of Computational Physics, 2023

• DOI for Boundary-optimized summation-by-parts operators for finite difference approximations of second derivatives with variable coefficients
• Download full text (pdf) of Boundary-optimized summation-by-parts operators for finite difference approximations of second derivatives with variable coefficients

Ultra and Very Long Period Seismic Signatures of Unsteady Eruptions Predicted From Conduit Flow Models

Coppess, Katherine R.; Dunham, Eric M.; Almquist, Martin

Part of Journal of Geophysical Research - Solid Earth, 2022

• DOI for Ultra and Very Long Period Seismic Signatures of Unsteady Eruptions Predicted From Conduit Flow Models
• Download full text (pdf) of Ultra and Very Long Period Seismic Signatures of Unsteady Eruptions Predicted From Conduit Flow Models

Elastic wave propagation in anisotropic solids using energy-stable finite differences with weakly enforced boundary and interface conditions

Almquist, Martin; Dunham, Eric M.

Part of Journal of Computational Physics, 2021

• DOI for Elastic wave propagation in anisotropic solids using energy-stable finite differences with weakly enforced boundary and interface conditions

Non-stiff boundary and interface penalties for narrow-stencil finite difference approximations of the Laplacian on curvilinear multiblock grids

Almquist, Martin; Dunham, Eric M.

Part of Journal of Computational Physics, 2020

• DOI for Non-stiff boundary and interface penalties for narrow-stencil finite difference approximations of the Laplacian on curvilinear multiblock grids

Order-preserving interpolation for summation-by-parts operators at nonconforming grid interfaces

Almquist, Martin; Wang, Siyang; Werpers, Jonatan

Part of SIAM Journal on Scientific Computing, 2019

• DOI for Order-preserving interpolation for summation-by-parts operators at nonconforming grid interfaces

Poroelastic effects destabilize mildly rate-strengthening friction to generate stable slow slip pulses

Heimisson, Elias R.; Dunham, Eric M.; Almquist, Martin

Part of Journal of the mechanics and physics of solids, p. 262-279, 2019

• DOI for Poroelastic effects destabilize mildly rate-strengthening friction to generate stable slow slip pulses

Tsunami Wavefield Reconstruction and Forecasting Using the Ensemble Kalman Filter

Yang, Yuyun; Dunham, Eric M.; Barnier, Guillaume; Almquist, Martin

Part of Geophysical Research Letters, p. 853-860, 2019

• DOI for Tsunami Wavefield Reconstruction and Forecasting Using the Ensemble Kalman Filter

Boundary optimized diagonal-norm SBP operators

Mattsson, Ken; Almquist, Martin; van der Weide, Edwin

Part of Journal of Computational Physics, p. 1261-1266, 2018

• DOI for Boundary optimized diagonal-norm SBP operators

Multilevel local time-stepping methods of Runge–Kutta-type for wave equations

Almquist, Martin; Mehlin, Michaela

Part of SIAM Journal on Scientific Computing, 2017

• DOI for Multilevel local time-stepping methods of Runge–Kutta-type for wave equations

A high-order accurate embedded boundary method for first order hyperbolic equations

Mattsson, Ken; Almquist, Martin

Part of Journal of Computational Physics, p. 255-279, 2017

• DOI for A high-order accurate embedded boundary method for first order hyperbolic equations

Realization of adiabatic Aharonov–Bohm scattering with neutrons

Sjöqvist, Erik; Almquist, Martin; Mattsson, Ken; Gürkan, Zeynep Nilhan et al.

Part of Physical Review A. Atomic, Molecular, and Optical Physics, 2015

• DOI for Realization of adiabatic Aharonov–Bohm scattering with neutrons

High-fidelity numerical solution of the time-dependent Dirac equation

Almquist, Martin; Mattsson, Ken; Edvinsson, Tomas

Part of Journal of Computational Physics, p. 86-103, 2014

• DOI for High-fidelity numerical solution of the time-dependent Dirac equation

Optimal diagonal-norm SBP operators

Mattsson, Ken; Almquist, Martin; Carpenter, Mark H.

Part of Journal of Computational Physics, p. 91-111, 2014

• DOI for Optimal diagonal-norm SBP operators

Atmospheric sound propagation over large-scale irregular terrain

Almquist, Martin; Karasalo, Ilkka; Mattsson, Ken

Part of Journal of Scientific Computing, p. 369-397, 2014

• DOI for Atmospheric sound propagation over large-scale irregular terrain

A solution to the stability issues with block norm summation by parts operators

Mattsson, Ken; Almquist, Martin

Part of Journal of Computational Physics, p. 418-442, 2013

• DOI for A solution to the stability issues with block norm summation by parts operators

Efficient Simulation of Wave Phenomena

Almquist, Martin

2017

• Download full text (pdf) of Efficient Simulation of Wave Phenomena

Unsteady simulations of rotor stator interactions using SBP-SAT schemes: Status and challenges

Giangaspero, Giorgio; Almquist, Martin; Mattsson, Ken; van der Weide, Edwin

Part of Spectral and High Order Methods for Partial Differential Equations, p. 247-255, 2015

• DOI for Unsteady simulations of rotor stator interactions using SBP-SAT schemes: Status and challenges

Stable and accurate wave simulations in complex geometries and discontinuous media

Mattsson, Ken; Almquist, Martin; Engblom, Stefan

Part of Proc. 11th International Conference on Mathematical and Numerical Aspects of Waves, p. 201-202, 2013

Stable and accurate simulation of phenomena in relativistic quantum mechanics

Almquist, Martin; Mattsson, Ken; Edvinsson, Tomas

Part of Proc. 11th International Conference on Mathematical and Numerical Aspects of Waves, p. 213-214, 2013

Optimal diagonal-norm SBP operators

Mattsson, Ken; Almquist, Martin; Carpenter, Mark H.

2013

• Download full text (pdf) of Optimal diagonal-norm SBP operators

Atmospheric sound propagation over large-scale irregular terrain

Almquist, Martin; Karasalo, Ilkka; Mattsson, Ken

2013

• Download full text (pdf) of Atmospheric sound propagation over large-scale irregular terrain