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About IRSC seismic waveforms
In each directory within directory example_apsheron_irsc_data, there are waveform files for one event. Each station of IRSC network has three components and if everything is okay, one station should have three files, one for each of the three components. However, for IRSC stations we often see that there are much more files for one component of a given station. The number may reach hundreds sometimes. Therefore, it is not easy to understand how many stations has recorded a given event just by counting the number of files.
The name of waveform files follows a fixed rule. It always start with a Y and station name, component, seismometer type, date, and time comes later. For example YZEFSPE.20100603.045437 is a waveform file for station ZEF for component E of a short period (SP) seismometer for starting date 20100603 and time 045437. In next slide, we want to use bash scripting commands to count the total number of stations recorded a given event.