%0 Journal Article
%T Calibration of the Wiechert seismographs relative to a reference seismometer
%A Allegretti
%A Ivo
%A Duda
%A Seweryn J.
%A Herak
%A Davorka
%A Herak
%A Marijan
%J -
%D 1996
%X Sa£żetak The horizontal 1000 kg Wiechert seismograph has been calibrated on the basis of a comparison of its records to the ones that were obtained by the reference seismometer. The resulting magnification curve shows notable deviations from the theoretical one. Its most prominent feature is a sudden magnification increase observed for frequencies above 5 Hz, which is attributed to frame oscillations excited by the seismic waves. Also, the observed average response curve exhibits larger magnification for frequencies below the resonance frequency. The results indicate a non-linear behavior of the Wiechert instrument related to the degree of impulsiveness of the excitation
%K Seismograph calibration
%K historical instrumentation
%K Wiechert seismograph
%U https://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=29228