TO DO: To have a proper low frequency data required for solving tomography problem, we need to list the specific stations recording the event from a general station list of the Canterbury region; re-sample the recorded seismogram to expected sampling rate; shift the recorded data based on the given time shift; and filter the data to the frequency band interested.
Example of recorded data before and after applying filter from 0-0.2Hz for event 3550173m4pt7 at station DFHS
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Comparison between the observed seismogram and seismogram simulated using emod3d with srf source for a homogeneous model; both are filtered from 0-0.1Hz
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Quantify waveform similarity between synthetic and observed seismograms for 78 stations according to event 3550173m4pt7 using normalized correlation coefficient (NCC) defined as
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Example of removing low-quality observed seismograms with NCC<0.2
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