Fig. 2From: Real-time crustal monitoring system of Japanese Islands based on spatio-temporal seismic velocity variationExample of the current trace (blue) and the reference trace (red). The rectangles represent the time windows of the coda part of the seismograms, used to estimate seismic velocity changes by the stretching interpolation method. In order to reduce strong noise from Mt Aso, we use the trace side that the waveform propagates to Mt. Aso (positive time)Back to article page