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27.2 Program QSTAT

This program also use the codaq.area to make statistics etc. After running CODAQ, codaq.area contains all individule coda Q determinations. The program first finds all the stations which has contributed to the calculations and makes an output file qstat.stat with station codes and station coordiantes (require STATION0.HYP) so a map can be made with the 'good' stations. If a station is not found in STATION0.HYP, the lat-lon will be 0.0 0.0 in output file. Then a plot is made with Q as a function of distance for each frequecy and a histogram is made with the the distribution of Q values for each frequency. The latter is intended to be illustrate the spred in the Q values and is useful when comparing Q from different area The latter is intended to be illustrate the spred in the Q values and is useful when comparing Q from different areas.

Figure 27.2: The top plot shows Coda Q as a function of epicentral distance and the bottom plot shows the distribution of individual Q-values for each frequency.
\begin{figure}
\centerline{\includegraphics[width=0.9\linewidth]{fig/qstat2}}
\end{figure}


next up previous contents index
Next: 27.3 Program AVQ, average Up: 27. Calculation of coda Previous: 27.1 Program CODAQ_AREA   Contents   Index
Peter Voss : Wed Aug 9 08:16:56 UTC 2017