Preprints

Filtering by Subject: Tribology

Spectral boundary integral method for simulating static and dynamic fields from a fault rupture in a poroelastodynamic solid

Elias Rafn Heimisson, Antonio Pio Rinaldi

Published: 2021-08-24
Subjects: Applied Mechanics, Geophysics and Seismology, Partial Differential Equations, Tribology

The spectral boundary integral method is popular for simulating fault, fracture, and frictional processes at a planar interface. However, the method is less commonly used to simulate off-fault dynamic fields. Here we develop a spectral boundary integral method for poroelastodynamic solid. The method has two steps: first, a numerical approximation of a convolution kernel and second, an efficient [...]

Crack to pulse transition and magnitude statistics during earthquake cycles on a self-similar rough fault

Elias Rafn Heimisson

Published: 2019-10-08
Subjects: Earth Sciences, Engineering, Geophysics and Seismology, Mechanical Engineering, Physical Sciences and Mathematics, Tectonics and Structure, Tribology

Faults in nature demonstrate fluctuations from planarity at most length scales that are relevant for earthquake dynamics. These fluctuations may influence all stages of the seismic cycle; earthquake nucleation, propagation, arrest, and inter-seismic behavior. Here I show quasi-dynamic plane-strain simulations of earthquake cycles on a self-similar and finite 10 km long rough fault with [...]

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

Elias Rafn Heimisson, Eric M. Dunham, Martin Almquist

Published: 2019-03-18
Subjects: Applied Mechanics, Earth Sciences, Engineering, Geology, Geophysics and Seismology, Mechanical Engineering, Physical Sciences and Mathematics, Physics, Statistical, Nonlinear, and Soft Matter Physics, Tribology

Slow slip events on tectonic faults, sliding instabilities that never accelerate to inertially limited ruptures or earthquakes, are one of the most enigmatic phenomena in frictional sliding. While observations of slow slip events continue to mount, a plausible mechanism that permits instability while simultaneously limiting slip speed remains elusive. Rate-and-state friction has been successful [...]

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