基于背景噪声的烈度仪、强震计及地震计性能对比分析

通过在陡河地震台架设地震计、强震计及烈度仪3类仪器进行同台址观测,对记录的背景噪声进行RMS值、功率谱的计算和傅里叶谱分析,总结3类仪器的记录波形特征,对比分析3类仪器的地震监测能力。研究结果显示:宽频带地震计可以对背景噪声在全频率域内进行有效完整的记录;强震计只能对大于0.1 Hz的天然噪声进行有效记录;而烈度仪的记录则完全是仪器自噪声,其无法有效记录地脉动。

Comparison and analysis of intensity meter,strong seismometer and seismometer based on background noise

In this paper, three types of instruments, namely, seismometer, strong seismometer and intensity meter, were set up at Douhe Seismic Station for the same site observation. The RMS value, power spectral and Fourier spectral are calculated by the recorded micro-tremor. The waveform characteristics of the three types of instruments were summarized, and their seismic monitoring capabilities were compared and analyzed. The results show that the wide-band seismometer can effectively and completely record the micro-tremor in the full frequency domain. However, the strong seismometer can only effectively record the natural noise above 0.1 Hz. The intensity meter can only record the self-noise of the instrument and cannot effectively record the pulsation.