| 九寨沟MS7.0地震应急流动台站噪声水平分析 |
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| 引用本文： | 谢江涛,林丽萍,谌 亮.九寨沟MS7.0地震应急流动台站噪声水平分析[J].大地测量与地球动力学,2020,40(9):962-969. |
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| 作者姓名： | 谢江涛 林丽萍 谌 亮 |
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| 摘 要： | 选取九寨沟MS7.0地震应急流动台网6个台站2017-08-14～12-31记录的三分向连续波形资料，通过计算噪声功率谱密度及相应的概率密度函数分布，统计不同频率噪声水平PSD值的分布，对比地球新噪声模型，分析应急流动台网台站噪声水平的变化特征。结果表明，流动台站高频段噪声没有明显的地理空间分布特征，影响台站水平和垂直分向噪声水平的噪声源不同或者同一噪声源在水平和垂直分向的强度不同；受人为噪声和自然噪声的影响，平均噪声水平明显高于NHNM和NLNM的平均值，部分台站接近或高于NHNM。人为噪声和自然噪声都是宽频的，人为噪声与人类生产、生活作息相关，具有明显的昼夜变化，且在固定时段内可以产生某单一频率的固定噪声；自然噪声中小溪流水可以产生持续的高频噪声，不同频段的噪声水平也不同，没有明显的昼夜变化。
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| 关 键 词： | 九寨沟MS7.0地震 应急流动地震台站 功率谱密度 概率密度函数 高频噪声 |
Ambient Noise Level of MS7.0 Jiuzhaigou EarthquakeEmergency Mobile Stations |
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| XIE Jiangtao,LIN Liping,CHEN Liang.Ambient Noise Level of MS7.0 Jiuzhaigou EarthquakeEmergency Mobile Stations[J].Journal of Geodesy and Geodynamics,2020,40(9):962-969. |
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| Authors: | XIE Jiangtao LIN Liping CHEN Liang |
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| Abstract: | We select three components of continuous waveform data observed by six seismic stations from August 14 to December 31, 2017 in MS7.0 Jiuzhaigou earthquake emergency mobile network, and then calculate the noise PSDs and corresponding PDFs. Compared with the new earth noise models(NHNM and NLNM), we analyze the variation characteristics of the noise level of emergency mobile stations. The results show that there are no obvious geometrical variations of noise in the high-frequency band of seismic station, the noise sources affecting the horizontal and vertical components noise levels of the stations are different, or the same noise source has different intensity in the horizontal and vertical components. Affected by culture noise and natural noise, the average noise level is significantly higher than the average of NHNM and NLNM, and some stations are close to or above the NHNM. Both culture and natural noise are broadband. Culture noise is closely related to the actions of human beings at or near the surface of the earth, shows very strong diurnal variations, and can generate a single frequency of fixed noise in a fixed period of time. The running water in small streams can produce continuous high-frequency natural noise. The noise level differs in different frequency bands, and the diurnal variation is not obvious. |
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| Keywords: | Jiuzhaigou MS7 0 earthquake emergency mobile seismic station power spectral density probability density function high frequency noise |
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