Traveltime Computation for qSV Waves in TI Media Using Physics-Informed Neural Networks
KAUST DepartmentEarth Science and Engineering Program
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/672093
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AbstractTraveltimes corresponding to both compressional and shear waves are needed for many applications in seismology ranging from seismic imaging to earthquake localization. Since the behavior of shear waves in anisotropic media is considerably more complicated than the isotropic case, accurate traveltime computation for shear waves in anisotropic media remains a challenge. Ray tracing methods are often used to compute qSV wave traveltimes but they become unstable around triplication points and, therefore, we often use the weak anisotropy approximation. Here, we employ the emerging paradigm of physics-informed neural networks to solve transversely isotropic eikonal equation for the qSV wave that otherwise are not easily solvable using conventional finite difference methods. By minimizing a loss function formed by imposing the validity of eikonal equation, we train a neural network to produce traveltime solutions that are consistent with the underlying equation. Through tests on synthetic models, we show that the method is capable of producing accurate qSV wave traveltimes even at triplication points and works for arbitrary strength of medium anisotropy.
CitationWaheed, U. B., Alkhalifah, T., Li, B., Haghighat, E., Stovas, A., & Virieux, J. (2021). Traveltime Computation for qSV Waves in TI Media Using Physics-Informed Neural Networks. 82nd EAGE Annual Conference & Exhibition. doi:10.3997/2214-4609.202112541
Conference/Event name82nd EAGE Annual Conference & Exhibition