█ About 100-trace Continuous Waveform Images
We draw images of the one-hour continuous seismic waveform recorded at
100 NIED Hi-net stations among about 800 stations.
Each trace shows the one-hour waveform at each station from north to south
and horizontal axis shows the minute.
Left figure denote the distribution of 100 seismic stations.
Ten northern red circles correspond to the stations of top 10 traces
and next ten blue circles correspond to the next 10 traces.