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5.11 Known problems in SEISAN

This list describe some of the known problems in SEISAN:

1:
Azimuthal of arrival (h command in MULPLT single trace), channels with orientation code 1 and 2 are handled as N and E. If the orientation of 1 and 2 is off North and East the estimated azimuth will be wrong.
2:
Particle motion (PartM or P command in MULPLT multi trace) will not work with channels that has orientation code 1 and 2.
3:
The Nordic format (Appendix A) does not include location id. One is thereofre n ot able to distinguish phase readings done on stations with two one more similar channels with differen location id.
4:
The iterative inversion done by the location program HYPOCENTER, does in some cases end up in a local minimum and not the best solution. See page 104.
5:
If waveform data from a three component sensor is rotated it is assumed that the response is t he same on all three rotated channels (Z,R,T).
6:
The Nordic format (Appendix A) does not include instrument code. So, if a station is equipt with both a seismometer HHZ and a acceleroemter HNZ, one will not be able to distinguish between phase readings.

Other known problems are listed in the index.


next up previous contents index
Next: 6. Description of Programs Up: 5. Using SEISAN Previous: 5.10 Logging in SEISAN   Contents   Index
Peter Voss : Thu Jan 18 09:09:13 UTC 2018