MI3000和GL-P2C地震烈度仪性能对比

在合肥地震台和安徽省地震局仪器检测室均架设MI 3000和GL-P2C地震烈度仪,分别进行同台址观测,对记录的背景噪声进行RMS值和噪声功率谱计算,对比分析2种烈度仪性能。研究结果显示:①自噪声水平:2种烈度仪水平向自噪声水平均约为垂直向的50%,且MI 3000地震烈度仪约为GL-P2C地震烈度仪的3倍;②频带范围:GL-P2C地震烈度仪比MI 3000地震烈度仪频带范围更宽,且在0.1—40 Hz范围内,比MI 3000地震烈度仪记录信号的噪声功率谱降低约10 dB。分析认为,相对于MI 3000地震烈度仪,GL-P2C地震烈度仪性能更佳。

Performance to analysis of MI 3000 and GL-P2C seismic intensity meter

Two kinds of intensity meters are deployed both at the Hefei Seismic Station and the instrument testing room of the Anhui Earthquake Agency and their performance characteristics are compared and analyzed by RMS value and noise power spectrum of the recorded background noise. The result shows that the horizontal self-noise level is about 50% of the vertical self-noise level for both instruments and the self-noise level of the MI 3000 seismic intensity meter is about 3 times that of the GL-P2C seismic intensity meter. The frequency range of the GL-P2C seismic intensity meter is wider than that of the MI 3000 seismic intensity meter. The noise power spectrum of the signal recorded by the GL-P2C seismic intensity meter is about 10 dB lower than that recorded by the MI 3000 seismic intensity meter in the frequency range of 0.1-40 Hz. To sum up, the performance of the GL-P2C seismic intensity meter is better than that of the MI 3000 seismic intensity meter.