Regional Phase Processors

摘要: Abstract : The purpose of this study is to evaluate the principle technique known as Smart processor, developed at SDAC (Smart, 1977) and determine propagation direction regional seismic phases by operating on a comprehensive data set. single-station maximum-likelihood surface-wave processor variants thereof, all relying three-component particle-motion analysis, demonstrated in their utility for automatic signal azimuth determination. In was found be that which simply maximized ratio energy between components. Thus P wave determined minimizing transverse component, L(g) maximizing emergence cycle finding best rectilinear motion fit 3 components data. For entire test set, average azimuthal error 6.7 degrees signals, 7.0 arrivals. Combining estimated with wave, taking mean, increased accuracy. difference mean true geodesic 4.9 (7.0 rms). Moreover, F-statistic computed these processors serves separate poor estimates from population: (over 80% set) passed arbitrary F threshold set differed azimuths an 3.9 (4.9 It author's experience such accuracy comparable or better than well-designed array sensors.