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Group Velocity Measurements of Earthquake Rayleigh Wave by S Transform and Comparison with MFT
Mediciones de velocidad grupal de la onda de Rayleigh del terremoto por transformación S y comparación con MFT
DOI:
https://doi.org/10.15446/esrj.v24n1.85366Keywords:
Earthquake Rayleigh waves, group velocity, S transform, Multiple Filter Technique (en)Ondas de Terremoto Rayleigh, velocidad de grupo, Transformación S, Técnica de filtro múltiple. (es)
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Based upon the synthetic Rayleigh wave at different epicentral distances and real earthquake Rayleigh wave, S transform is used to measure their group velocities, compared with the Multiple Filter Technique (MFT) which is the most commonly used method for group-velocity measurements. When the period is greater than 15 s, especially than 40 s, S transform has higher accuracy than MFT at all epicenter distances. When the period is less than or equal to 15 s, the accuracy of S transform is lower than that of MFT at epicentral distances of 1000 km and 8000 km (especially 8000 km), and the accuracy of such two methods is similar at the other epicentral distances. On the whole, S transform is more accurate than MFT. Furthermore, MFT is dominantly dependent on the value of the Gaussian filter parameter α, but S transform is self-adaptive. Therefore, S transform is a more stable and accurate method than MFT for group velocity measurement of earthquake Rayleigh waves.
Basado en la onda de Rayleigh sintética a diferentes distancias epicentrales y la onda de Rayleigh de terremoto real, la transformación S se usa para medir las velocidades de sus grupos, en comparación con la técnica de filtro múltiple (MFT), que es el método más utilizado para las mediciones de velocidad de grupo. Cuando el período es mayor de 15 s, especialmente de 40 s, la transformación S tiene mayor precisión que la MFT en todas las distancias del epicentro. Cuando el período es menor o igual a 15 s, la precisión de la transformación S es menor que la de MFT a distancias epicentrales de 1000 km y 8000 km (especialmente 8000 km), y la precisión de estos dos métodos es similar en el otro distancias epicentrales. En general, la transformación S es más precisa que la MFT. Además, MFT depende predominantemente del valor del parámetro de filtro gaussiano α, pero la transformación S es autoadaptativa. Por lo tanto, la transformación S es un método más estable y preciso que el MFT para la medición de la velocidad grupal de las ondas de Rayleigh del terremoto.
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