Method for estimating azimuthal intensity distribution of microtremors using simple arrays
نویسندگان
چکیده
SUMMARY In this paper, a method is proposed for estimating the intensity distribution of microtremors arrival direction, from simultaneous observations vertical motion, using an array simple geometry consisting only three receivers. This based on fact that complex coherence function, which defined as normalized cross-spectrum microtremor recordings observed at two sites, contains information about azimuthal field. To obtain limited number conditions, functional form field was assumed and its parameters were estimated. Information direction specifically obtained particle swarm optimization (PSO), one metaheuristic methods, then employed to identify parameters. The applied ideal synthetic data clarify potential problems may arise PSO core algorithm. Despite PSO-induced errors, able accurately infer directional over wide frequency range. also actual verify effectiveness applicability. results indicate can provide similar frequency–wavenumber (FK) in quasi-FK spectrum, effective mode representation FK displayed visualize directionality.
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 2023
ISSN: ['1365-246X', '0956-540X']
DOI: https://doi.org/10.1093/gji/ggad228