Running the program:
Type codaq, the program asks about output: 0: Only q is calculated, ente ris 0 for default 1: Q is calculated and a plot on the tek screen is shown 2: Q , and at the same time hard copy plots are made. 3: Q is calculated and hard copy plots are made, but no screen plot. Parameter file, name codaq.par is default (return) Just hit return if default file, otherwise give name. File with event stations, codaq.inp is default (return) Just hit return if default file, otherwise give name.
The program will now start to run. Alterantively, the progran can be started with arguments on the promt line:
codaq n parameter-file data-file
or alternatively when doing channel averages
codaq -c n parameter-file data-file
and no questions are asked. n is the choice 0 to 3 above.
If no plot is chosen, one line will appear on the screen for each station used and one for each frequency. The program will start a new page for each new event. If you are plotting on the screen, you will therefore have to hit return to get the next plot. The screen might not have been filled out if there are few data.
All questions will appear in the text window. At the end, a summary is given, which is the same as logged in the output file codaq.out.
The abbreviations are:
|TP:||P travel time|
|TC:||Start time of coda window relative to origin time|
|Q:||Corresponding coda q, if 0 value is 10000 or negative|
|S/N:||Signal to noise ratio AV|
|SD:||Standard deviation for average|
|NT:||Total number of q values at all frequencies|
|N:||Number of q values at given frequency|
|q:||Average of q values|
|1/q:||q is calculated as 1/q averages, probably the best to use|
|f:1/q:|| Q values calculated using the relation derived from the 1/q averages
q = q0*f**v obtained with the average 1/q-values
|cq0:||Constant q0 obtained using the fixed user selected v|
|v:||Constant v determined|
|cor:||Correlation coefficient on determining q vs f|
|corr:||Average correlation coefficients of individual codaq calculations when fitting the envelope, both average and standard deviation is given|
If a station is not present or no P is read, a message will be given. The program will search for the first P arrival time in the S-file. If several are present for the same station, it will use the first.
Peter Voss 2022-05-06T16:12Z | Please contact firstname.lastname@example.org regarding the webpage, it is hosted by The Geological Survey of Denmark and Greenland (GEUS) | xxxxxxxxxxxyyyyyyyyyyyy