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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After filtering |
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
Here, the synthetic seismograms are generated using srf source for a homogeneous model of Vs=3.0km/s, Vp=6.0 km/s
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Example of removing low-quality observed seismograms with NCC<0.2
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Normalize the observed seismogram at a station for 3 different events:
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Normalized observed seismograms |
