gonzalo
the simplest would be to not use the additionbal filter,it is only there
to avoid unsstability when determining Ml for very small events, say Ml <
2. use the filter at 9 Hz would also be ok.
jens
On Thu, 24 Jul 2014, gonzalo antonio fernandez marañon wrote:
Dear Seisan Gurus.
Have a wonderful day, I have a question about the Wood Anderson filter to
calculate the Ml magnitude.
1. We are getting data from a Broad Band station from another Data Center,
the sampling rate is 20sps
2. The WA Filter is set from 1.25 to 20 (I assume it is a Band Pass), of
course I can modify the valu in MULPLT.DEF
3. When I tryed to get the Ml magnitude (following the manual procedure)
with this station I got an error which told that it is not possible filter
due to the sampling rate, of course it is logical.
4. So I decided to change the filter range from 1.25 to 9 in MULPLT.DEF,
then I got no error and I could get the Ml magnitude.
As the Broad Band station has 20sps the maximun frquency work is 10 rigth
(due to the sampling theorem) that is the reason I put 1.25 to 9 for a WA
filter.
The question are:
Does anyone think (I accept all comentaries) that the Ml magnitude for a
local earthquake can be used?
Is the filter range logical?
Thank you for your time.
Best Regards.
Gonzalo F
_______________________________________________
seisan mailing list
[email protected]
http://mailman.uib.no/listinfo/seisan
