Figure 8
From: Systematic monitoring of instrumentation health in high-density broadband seismic networks
Temporal changes in index parameters for NS and EW components at TYS. Maximum cross-correlation coefficients (top), amplitude ratios (middle), and lag time errors (bottom) as a function of the teleseismic event time for NS and EW components at TYS within period ranges of 50 to 100 s and 100 to 200 s. Open circles and error bars represent index parameters estimated by fitting ellipses and standard deviations evaluated by the Bootstrap method. Pink lines show variance reductions.