On the suitability of 1 s geophone for ambient noise measurements in the 0.1–20Hz frequency range: experimental outcomes

摘要

Following the ongoing debate about suitability of short-period sensor for seismicnoise measurements at frequencies lower than 1Hz, in this study we compare recordings fromtwo different seismometers (Güralp CMG-3ESPC and Mark L4C-3D) installed side by sidein the GeoForschungsZentrum laboratory. The comparison carried out in terms of PowerSpectral Density and coherency analysis shows an excellent agreement between the shortperiodand the broad-band recordings in the frequency band 0.2–20 Hz. Therefore, this resulthighlights that with a calibrated short-period sensor one can obtain the same results thatwould be obtained by using a broad-band seismometer in the band of engineering interest.