| 全台网垂直摆倾斜仪背景噪声水平分析 |
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| 引用本文： | 赵莹.全台网垂直摆倾斜仪背景噪声水平分析[J].大地测量与地球动力学,2019,39(8):869-874. |
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| 作者姓名： | 赵莹 |
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| 作者单位： | 中国地震局地震研究所地震大地测量重点实验室,武汉市洪山侧路40号,430071;中国地震局地壳应力研究所武汉科技创新基地,武汉市洪山侧路40号,430071 |
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| 基金项目： | 中国地震局“三结合”课题;中国地震局地震研究所基本科研业务费专项和中国地震局地壳应力研究所基本科研业务费专项 |
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| 摘 要： | 利用全台网垂直摆倾斜仪的观测数据，研究不同采样率对功率谱密度结果的影响，并对不同台站、不同类型仪器连续观测数据在地震频段（200~600 s）的背景噪声水平进行着重分析。结果表明：1）不论是单个测站还是全国台网的统计结果，均显示2类垂直摆在地震频段噪声水平相当；2）在区域分布上未见明显规律性变化，但由于受海浪及活跃构造运动的影响，沿海地区部分台站噪声水平较高；3）高噪声水平仪器观测曲线普遍表现为不光滑、毛刺多，除部分台站受海浪影响，大多是观测环境或仪器本身的原因。
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| 关 键 词： | 垂直摆倾斜仪 功率谱密度 背景噪声 |
Research on Background Noise Level of Vertical Pendulum Tiltmeter in China |
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| ZHAO Ying.Research on Background Noise Level of Vertical Pendulum Tiltmeter in China[J].Journal of Geodesy and Geodynamics,2019,39(8):869-874. |
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| Authors: | ZHAO Ying |
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| Abstract: | Using the observation data of the vertical pendulum tiltmeter in China, we study the influence of different sampling rates on the results of power spectral density. We emphatically analyze the background noise level of the seismic frequency band (200~600 s) of different stations and different types of instruments. The conclusions are as follows: (1) Both single station and national statistics show that the noise levels of the two types of pendulum tiltmeter are equal in the seismic frequency band. (2) There is no obvious regularity in the regional distribution, but due to the influence of ocean and active tectonic movement, the noise levels of some stations in coastal areas are relatively high. (3) The curves of high noise level instrument are generally not smooth and burr-prone. Except for some stations affected by the ocean, they are mostly caused by the observation environment or the instrument itself. |
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| Keywords: | vertical pendulum tiltmeter power spectral density background noise |
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