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Fig. 6 | Earth, Planets and Space

Fig. 6

From: Estimation of phase velocity using array observation of microtremors with arbitrary shape

Fig. 6

Estimated values of unknown parameters for various shapes of triangles. The different color corresponds to the different shape of triangles. The estimated value is shown with its error bar, which denotes the mean value and plus-minus one standard deviation. The fluctuations in the estimated value are caused by the initial data sets of PSO. Short error bars show that PSO can identify stably unknown parameters, though large error bars show unstable identifications. The parameters are set at \(f=10\) [Hz], \(c(f)=0.165\) [km/s], \(X_1=0.01378\), \(Y_1=-0.008617\), \(X_2=-0.05611\), and \(Y_2=0.006514\). The horizontal gray lines are the target values for each unknown parameter. The three-digit numbers in the legend represent the receiver ID and the array shape (e.g., “4–6–7” is identical to R4-R6-R7 and corresponds to an equilateral triangle)

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