[1]邓明文,许 鑫,李 金.乌鲁木齐及周边地区新冠疫情前后背景噪声分析[J].华南地震,2023,(03):7-18.[doi:10.13512/j.hndz.2023.03.02]
　DENG Mingwen,XU Xin,LI Jin.Background Noise Analysis Before and After the COVID-19 Epidemic in Urumqi and Its Surrounding Areas[J].,2023,(03):7-18.[doi:10.13512/j.hndz.2023.03.02]
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乌鲁木齐及周边地区新冠疫情前后背景噪声分析()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
期数:
2023年03期
页码:
7-18
栏目:
地震科学研究
出版日期:
2023-09-20

文章信息/Info

Title:
Background Noise Analysis Before and After the COVID-19 Epidemic in Urumqi and Its Surrounding Areas
文章编号:
1001-8662（2023）03-0007-12
作者:
邓明文1; 许 鑫2; 李 金3
1.库尔勒地震监测中心站，新疆 库尔勒 841000;2.中国地质大学，武汉 430074;3.新疆维吾尔自治区地震局，乌鲁木齐 830011
Author(s):
DENG Mingwen1; XU Xin2; LI Jin3
1.Kuerle Earthquake Monitoring Center Station ， Kuerle 841000， China;2.China University of Geosciences ， Wuhan 430074， China;3.Earthquake Agency of Xinjiang Uygur Autonomous Region ， Urumqi 830011， China
关键词:
新冠疫情; 地震背景噪声; 概率密度函数; 人口迁徙大数据; 地震监测能力
Keywords:
The COVID-19 epidemic;  Seismic background noise;  Probability density function;  Big data of population migration; Seismic monitoring capability
分类号:
P315.78
DOI:
10.13512/j.hndz.2023.03.02
文献标志码:
A
摘要:
选取2019年1月至2022年12月乌鲁木齐及周边地区14个测震台站垂直分量波形记录，通过计算PSD（功率谱密度）和PDF（概率密度函数），统计不同频段功率谱密度分布情况，对比乌鲁木齐及周边地区疫情前后背景噪声变化特征，并结合大数据探讨人口迁徙与背景噪声变化的相关性。同时计算了疫情前后研究区最小完备震级（Mc），对比分析其地震监测能力变化特征。结果表明：研究区地震背景噪声水平受疫情影响出现不同程度的下降，高频段（1～35Hz）最大下降幅度为36.6dB，部分台站长周期频段下降突出，这是人类活动间接影响的；上述变化与人口迁徙大数据变化呈现了极大的正相关。此外在疫情封闭期间，地震监测能力并没有明显的提高，但部分台站获得更为清晰的震相记录。
Abstract:
The vertical component waveform records of 14 seismic stations in Urumqi and surrounding areas from January 2019 to December 2022 were selected，and the distribution of power spectral density in different frequency bands was calculated by calculating PSD（power spectral density）and PDF（probability density function). The characteristics of background noise changes before and after the epidemic in Urumqi and its surrounding areas were compared， and the correlation between population migration and background noise changes was discussed in combination with big data. The minimum complete magnitude（Mc）of the study area before and after the epidemic was also calculated，and the change characteristics of its seismic monitoring capacity were compared and analyzed.The results show that the seismic background noise level in the study area has decreased in different degree due to the influence of the epidemic，with a maximum decrease of 36.6 dB in the high frequency band（1-35 Hz），and the long-period frequency band of some stations has decreased significantly， which was indirectly influenced by human activities. In addition， there was no significant improvement in seismic monitoring capacity during the epidemic closure period，but some stations obtained clearer seismic phases records.

参考文献/References:

[1] Lecocq T，Hicks S P，Noten K V，et al. Lobal quieting of high?frequency seismic noise due to COVID-19 pandemic lock?down measures[J]. Science，2020，369（6509）：1338-1343.
[2] Grecu B，Borleanu F，Tiganescu A，et al. The effect of 2020 COVID-19 lockdown measures on seismic noise recorded in Romania[J]. Solid Earth，2021（12）：2351-2368.
[3] Arroyo-Solórzano M，Castro-Rojas D，Massin F，et al. COVID-19 lockdown effects on the seismic recordings in Central America[J]. Solid Earth，2021（12）：2127-2144.
[4] Cannata A，Cannavò F，Di Grazia G，et al. Seismic evidence of the COVID-19 lockdown measures：a case study from east?ern Sicily（Italy）[J]. Solid Earth，2021（12）：299-317.
[5] Boginskaya N V，Kostylev D V. Change in the level of microseismic noise during the COVID-19 pandemic in the Russian Far East[J]. Pure Appl Geophys，2022（179）：4207-4219.
[6] D′?az J. On the origin of the signals observed across the seismic spectrum[J]. Earth-Science Reviews，2016（161）：224-232.
[7] McNamara D E， uland R P. Ambient noise levels in the con-tinental United States[J]. Bulletin of the Seismological Soc-iety of America，2004，94（4）：1517-1527.
[8] Green D，Bastow I，Dashwood B，et al. Characterizing broad-band seismic noise in central London[J]. Seismological Research Letters，2017（88）：113-124.
[9]葛洪魁，陈海潮，欧阳飚，等. 流动地震观测背景噪声的台基响应[J].地球物理学报，2013，56（3）：857-868.
[10]邓明文，李晓东，张森，等.新冠疫情防控措施对新疆地区地球背景噪声影响分析[J]. 大地测量与地球动力学， 2021，41（9）: 985-990.
[11] Peterson J R. Observations and modeling of seismic back-ground noise[R]. Albuquerque： U. S. Geological Survey， 1993
[12]谢江涛，林丽萍，赵敏，等. 四川地区地震背景噪声特征分析[J]. 地震学报，2021，43（5）：533-550.
[13]吴建平，欧阳飚，王未来，等. 华北地区地震环境噪声特征研究[J]. 地震学报，2012，34（6）：818-829.
[14]谢江涛，林丽萍，谌亮.九寨沟MS 7.0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.
[15]谢江涛，林丽萍，谌亮，等.地震台站台基噪声功率谱概率密度函数Matlab实现[J].地震地磁观测与研究，2018， 39（2）：84-89.
[16] Welch P. The use of fast fourier transform for the estimation of power spectra ：A method based on time averaging over short，modified periodograms[J]. IEEE Trans Audio Ele-ctroacoust，1967，15（2）：70-73.
[17]杨千里，郝春月，田鑫.新疆和田台阵PSD与PDF分析[J]. 地球物理学报，2019，62（7）：2591-2606.
[18] Malovichko A A，Gabsatarova I P，Dyagilev R A，et al. Evaluation of the detection and location capability of the seismic network in the western part of the north caucasus using network layout and local microseismic noise level[J]. Seismic Instruments，2021（57）：209-230 .
[19] Hong T K，Lee J，Lee G，et al. Correlation between ambient seismic noises and economic growth[J]. Seismological Research Letters，2020（91）：2343-2354.
[20] De Plaen R S M，Márquez-Ramírez V H，Pérez-Campos X， et al. Seismic signature of the COVID-19 lockdown at the city scale：a case study with low-cost seismometers in the city of Querétaro，Mexico[J]. Solid Earth，2021（12）：713-724.
[21]李志海，蒋长胜，黄瑜，等.新疆地区地震目录最小完整性震级和台网科学布局研究[J]. 地震学报，2011，33（6）：763-775.
[22]王霞，宋美琴，李丽，等.山西地区不同时段地震目录最小完整性震级研究[J].地震，2014，34（2）：82-88.
[23] Wiemer S，Wyss M. Minimum magnitude of completeness in earthquake catalogs：Examples from Alaska，the Western United States，and Japan[J]. Bulletin of the Seismological Society of America，2000，90（4）：859-869.
[24] Wessel P，Luis J F，Uieda L，et al. The generic mapping tools version 6[J]. Geochemistry，Geophysics，Geosystems，2019，20 (11)：5556-5564.

备注/Memo

备注/Memo:
收稿日期：2023-03-10
基金项目：新疆维吾尔自治区重点研发计划（2022B03001-1、 2020B03006-3）；新疆维吾尔自治区自然科学基金（2020D01A83）；中国地震局地震科技星火计划项目（XH22025D、XH21042）；中国地震局“监测、预报、科研”三结合课题（3JH-202001098、3JH-202301003）联合资助。
作者简介：邓明文（1988-），男，工程师，主要从事数字地震学方面研究。E-mail：754221210@qq.com
更新日期/Last Update: 2023-09-20