Index Geophysics

eng Calibration of the Wiechert seismographs relative to a reference seismometer

eng 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.

Herak, Marijan

Allegretti, Ivo

Herak, Davorka

Duda, Seweryn J.

eng Seismograph calibration; historical instrumentation; Wiechert seismograph

Andrija Mohorovicic Geophysical Institute

1996

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https://hrcak.srce.hr/18775

eng https://hrcak.srce.hr/file/29228

Geofizika

ISSN 0352-3659 (Print)

ISSN 1846-6346 (Online)

Volume 13

Issue 1

eng

info:eu-repo/semantics/openAccess

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