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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Estimating errors in autocorrelation functions for reliable investigations of reflection profiles

Fig. 4

Reflection responses along the ENE–WSW and ESE–WNW transects that are shown in Fig. 1. a Number of stacks. Arrows indicate Station E.STHM. b Reflection responses estimated using our method. The color is based on the ratios of the averages to standard deviations of weighted stacks (\({a}^{ave}\left(\tau \right)/{\sigma }^{a}(\tau )\)). White is used for amplitudes of less than three. c Reflection responses estimated using the conventional procedure, where stacking was performed without weights. The color is based on the ratio of the amplitudes to the maximum amplitude for \(\tau \ge 0.2\) s at each station. d J-SHIS P-wave velocity model (NIED, 2019b) used to convert lag time to depth in b and c. Gradations of red to orange indicate layers with low velocity (\(\le\) 2400 m/s). Yellow indicates an intermediate-velocity (3200 m/s) layer. Blue indicates a high-velocity (5500 m/s) layer. e Boundaries between low-, intermediate- and high-velocity layers from d superposed on b

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