| Title |
Reliability Assessment of Ambient Noise HVSR per Observation Condition |
| Authors |
유병호(Yoo, Byeongho) ; 최우정(Choi, Woojeong) ; 최인혁(Choi, Inhyeok) ; 곽동엽(Kwak, Dongyoup) |
| DOI |
https://doi.org/10.12652/Ksce.2022.42.1.0023 |
| Keywords |
HVSR; 상시미동; 공명주파수; 센서 안정화; 인위적 진동 HVSR; Ambient noise; Resonant frequency; Sensor stabilization; Artificial vibration |
| Abstract |
The horizontal-to-vertical spectral ratio (HVSR) of ambient noise is widely used to identify the resonant frequency of a site. The frequency at the largest HVSR is regarded as the resonant frequency. The source of ambient noise is impossible to identify and control.
Therefore, obtaining reliable HVSR of ambient noise requires sufficient measurement time and absence of near-field vibration. In this study, we investigated the minimum stabilization time required for a portable seismometer and the effect of the distance between the seismometer and artificial vibration on HVSR estimation. In the case of a soil site, the HVSR was stabilized after 5 minutes after sensor installation. In the case of a rock site, stabilization required more than an hour. Human-footsteps within 10 m of the seismometer strongly influenced the HVSR for the soil site. These results provide a field guideline when measuring ambient noise for HVSR. |