The medians of ratios from the broad-band
digitizers (G24) are close to one, but the lowest median values are obtained at stations with
short-period digitizers (RD3) in combination with either 1-Hz short-period (LE1) sensors, or
broad-band (
BB) sensors. The reason for the low ratios in the LE1-RD3 combination is
obviously failure to retrieve all the low frequency amplitude through instrument
/media/vedurstofan/utgafa/skyrslur/2009/VI_2009_012.pdf