TY - JOUR
N2 - The modeling of P-waves has essential applications in seismology. This is because the detection of the P-waves is the first warning sign of the incoming earthquake. Thus, P-wave detection is an important part of an earthquake monitoring system. In this paper, we introduce a linear computational cost simulator for three-dimensional simulations of P-waves. We also generalize our formulations and derivation for elastic wave propagation problems. We use the alternating direction method with isogeometric finite elements to simulate seismic P-wave and elastic propagation problems. We introduce intermediate time steps and separate our differential operator into a summation of the blocks, acting along the particular coordinate axis in the sub-steps. We show that the resulting problem matrix can be represented as a multiplication of three multi-diagonal matrices, each one with B-spline basis functions along the particular axis of the spatial system of coordinates. The resulting system of linear equations can be factorized in linear O (N) computational cost in every time step of the semi-implicit method. We use our method to simulate P-wave and elastic wave propagation problems. We derive the condition for the stability for seismic waves; namely, we show that the method is stable when τ < C min{ hx,hy,hz}, where C is a constant that depends on the PDE problem and also on the degree of splines used for the spatial approximation. We conclude our presentation with numerical results for seismic P-wave and elastic wave propagation problems.
L1 - http://journals.pan.pl/Content/124027/PDF/2962_BPASTS_2022_70_5.pdf
L2 - http://journals.pan.pl/Content/124027
PY - 2022
IS - 5
EP - e141985
A1 - Łoś, Marcin
A1 - Behnoudfar, Pouria
A1 - Dobija, Mateusz
A1 - Paszynski, Maciej
VL - 70
DA - 17.08.2022
T1 - ADI-based, conditionally stable schemes for seismic P-wave and elastic wave propagation problems
SP - e141985
UR - http://journals.pan.pl/dlibra/publication/edition/124027
T2 - Bulletin of the Polish Academy of Sciences: Technical Sciences
ER -