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http://dx.doi.org/10.7582/GGE.2013.16.4.203

Comparison of Backgroud Noise Characteristics between Surface and Borehole Station of Hwacheon  

Yun, Won Young (National Institute of Meteorological Research)
Park, Sun-Cheon (National Institute of Meteorological Research)
Kim, Ki Young (Department of Geophysics, Kangwon National University)
Publication Information
Geophysics and Geophysical Exploration / v.16, no.4, 2013 , pp. 203-210 More about this Journal
Abstract
To look into site characteristics of the Hwacheon borehole seismic station, we analyzed property of earthquake and microtremor recorded on surface and borehole seismometers. Acoording to analysis result of microtremor, the surface-to-borehole energy ratio was approximately 15 times greater during the daytime than during the nighttime, and the surface-to-borehole ratios of spectral amplitudes as frequency increases. For earthquake data, amplitude spectra and dominant frequency were computed using surface and borehole data. As a result, small earthquakes with short distance recorded on surface seismometer peaked at 8 Hz, 46 Hz. This result corresponds to resonance frequencies (7.4 Hz, 46 Hz) calculated by H/V spectral ratio. We confirmed amplification effect by site characteristics of overburden. Background noise level was approximately 20,000 times smaller at borehole seismic station than surface seismic station. These results provide strong evidence for the superior recording of earthquakes using borehole seismometers instead of surface seismometers.
Keywords
borehole seismic station; site characteristics; background noise;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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