The time scale and beginning of time for OJC may be different than for the other stations. RAC seismograms are given separately due to a different sensor type and are marked with a letter R added to the number. Filtering of traces was generally avoided, if only possible. In some cases, however, there was need to use a third-order Butterworth bandpass filter from 100 s to 1Hz to cut out very local noise. This was chosen as to bring out the maximum detail, as it is expected that for any digital data analysis one will turn to the data themself, not to their plot on paper.
Future plans are dependent in much way on station setup.
Time permitting, RAC would obtain broadband BB-13 sensors dismounted from OJC . Not possible is the inclusion of data from our last station, NIE , which reports exclusively in special bulletin internal format which cannot be handled by ordinary software and after all, is a short period station only. There was also a temporary station CZA, supplying high quality seismic data. Three component at central site plus two additional vertical sensors on dam. These are long period instruments not broadband.