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This program is similar to COMPARE_HYP, but simpler, in that it compares two Nordic files and writes out differences. Typical application is that one wishes to see how changes in velocity model, station coordinates, software version, format changes etc affect the location results. Here is an example of how the program runs:
Program to compare hypocenters from two Nordic files
Name of first Nordic file, reference data
select.out
Name of second Nordic file
hyp.out
Enter minimum numbers to select event with significant change : distance (km)/depth (km)/rms
10 10 .5
2021 1 1 17 3 56.3 LQ 78.559 -18.893 15.0F BER 10 .90 3.9wBER 3.2LNAO
2021 0101 1703 56.4 LQ 78.555 -18.862 15.0F BER 10 1.6 3.9wBER 3.2LNAO
change epicentre,depth,rms: 0.8 0.0 0.7
2021 1 3 1842 9.5 LQ 77.328 7.938 24.2 BER 10 .70 3.3wBER 2.3LNAO
2021 0103 1842 09.5 LQ 77.328 7.938 24.2 BER 10 1.3 3.3wBER 2.3LNAO
change epicentre,depth,rms: 0.0 0.0 0.6
2021 113 2025 25.8 LQ 73.515 7.829 27.3 BER 12 .50 3.5wBER 2.6LNAO
2021 0113 2025 25.8 LQ 73.515 7.829 27.3 BER 12 1.2 3.5wBER 2.6LNAO
change epicentre,depth,rms: 0.0 0.0 0.7
2021 113 2224 34.1 LQ 73.592 7.963 10.0F BER 36 1.0 4.0wBER 3.1LNAO
2021 0113 2224 34.1 LQ 73.592 7.963 10.0F BER 36 1.5 4.0wBER 3.1LNAO
change epicentre,depth,rms: 0.0 0.0 0.5
2021 114 012 53.6 LQ 73.617 8.383 10.0F BER 30 1.2 3.8wBER 3.1LNAO
2021 0114 0012 53.6 LQ 73.618 8.387 10.0F BER 30 2.0 3.8wBER 3.1LNAO
change epicentre,depth,rms: 0.2 0.0 0.8
2021 114 025 1.8 LQ 79.718 3.795 23.0 BER 13 1.0 3.8wBER 3.3LNAO
2021 0114 0025 01.8 LQ 79.718 3.795 23.0 BER 13 1.7 3.8wBER 3.3LNAO
change epicentre,depth,rms: 0.0 0.0 0.7
2021 117 1229 3.1 LQ 73.454 7.847 10.0F BER 22 .90 3.9wBER 3.1LNAO
2021 0117 1229 03.1 LQ 73.454 7.847 10.0F BER 22 1.5 3.9wBER 3.1LNAO
change epicentre,depth,rms: 0.0 0.0 0.6
2021 122 4 8 6.1 LQ 77.441 7.562 19.1 BER 8 .80 3.6wBER 2.3LNAO
2021 0122 0408 06.1 LQ 77.441 7.562 19.1 BER 8 1.4 3.6wBER 2.3LNAO
change epicentre,depth,rms: 0.0 0.0 0.6
2021 122 424 24.6 LQ 77.404 7.517 22.7 BER 9 .60 3.7wBER 2.7LNAO
2021 0122 0424 24.6 LQ 77.404 7.517 22.7 BER 9 1.2 3.7wBER 2.7LNAO
change epicentre,depth,rms: 0.0 0.0 0.6
2021 124 7 3 0.3 LQ 73.522 7.917 10.0F BER 20 .90 3.9wBER 2.2LNAO
2021 0124 0703 00.3 LQ 73.522 7.917 10.0F BER 20 1.6 3.9wBER 2.2LNAO
change epicentre,depth,rms: 0.0 0.0 0.7
End of s-file
the standard deviation of the difference to the reference for the 3 parameters is: epicenter: 0.87 depth: 1.25 rms: 0.39
Number of events in input file 34
Output file names are:
comp_hyp.out: list with changes of all events
comp_hyp_change.out: list of events that changed
comp_hyp_events_changed.out: nordic format
comp_hyp_events_unchanged.out: nordic format
In this example the files select.out and hyp.out were compared. A number of output files are generated.