Sir i am calculating the Richter magnitude from single station data. For that i using Z component (always????) of the trace after pressing WA and by selecting the window (4 -5 sec near S-wave arrival) i am getting the amplitude in nm. But in some cases the P wave component of Z is more than that of S-wave, at the same time the other component E and N shows S wave amplitude more than P-wave. In such case which component i may use for magnitude calculation. Secondly E , N gives large ( large amplitude due to soil amplification ???) and Z traces gives less amplitude. In such case which trace one should use to calculate the Richter magnitude for local event (<100km) with what filter range. Regards Sachin
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