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Separation of multi‐mode surface waves by supervised machine learning methods
Author(s) -
Li Jing,
Chen Yuqing,
Schuster Gerard T.
Publication year - 2020
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/1365-2478.12927
Subject(s) - dispersion (optics) , surface wave , interference (communication) , support vector machine , kernel (algebra) , frequency domain , artificial neural network , seismic trace , algorithm , geology , surface (topology) , optics , computer science , pattern recognition (psychology) , artificial intelligence , mathematics , physics , geometry , wavelet , telecommunications , channel (broadcasting) , computer vision , combinatorics
Logistic regression, neural networks and support vector machines are tested for their effectiveness in isolating surface waves in seismic shot records. To distinguish surface waves from other arrivals, we train the algorithms on three distinguishing features of surface‐wave dispersion curves in the k − ω domain: spectrum coherency of the trace's magnitude spectrum, local dip and the frequency range for a fixed wavenumber k in the spectrum. Numerical tests on synthetic data show that the kernel‐based support vector machines algorithm gives the highest accuracy in predicting the surface‐wave window in the k − ω domain compared to neural networks and logistic regression. This window is also used to automatically pick the fundamental dispersion curve. The other two methods correctly pick the low‐frequency part of the dispersion curve but fail at higher frequencies where there is interference with higher‐order modes.