[1]文雯,毛先进,杨玲英,等.MT/CSELF视电阻率影响系数及各地层贡献的初步研究[J].华南地震,2020,40(04):29-34.[doi:10.13512/j.hndz.2020.04.04]
　WEN Wen,MAO Xianjin,YANG Lingying,et al.A Preliminary Study on the Influence Coefficients of MT/CSELF Apparent Resistivity and the Contributions of Each Layer[J].,2020,40(04):29-34.[doi:10.13512/j.hndz.2020.04.04]
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MT/CSELF视电阻率影响系数及各地层贡献的初步研究()
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华南地震[ISSN:1006-6977/CN:61-1281/TN]

卷:
40
期数:
2020年04期
页码:
29-34
栏目:
地震研究
出版日期:
2020-12-30

文章信息/Info

Title:
A Preliminary Study on the Influence Coefficients of MT/CSELF Apparent Resistivity and the Contributions of Each Layer
文章编号:
1001-8662（2020）04-0029-06
作者:
文雯; 毛先进; 杨玲英; 段炜
云南省地震局,昆明 650224
Author(s):
WEN Wen; MAO Xianjin; YANG Lingying; DUAN Wei
Yunnan Earthquake Agency,Kunming 650224,China
关键词:
MT/CSELF; 地震监测; 影响系数; 地层贡献; 频段选择
Keywords:
MT/CSELF; Seismic monitoring; Influence coefficient; Contribution of layers; Frequency band selection
分类号:
P315.72
DOI:
10.13512/j.hndz.2020.04.04
文献标志码:
A
摘要:
为研究地下介质电阻率随时间的变化,对水平分层均匀电阻率结构,研究了MT/CSELF视电阻率影响系数和各层对视电阻率变化的贡献,研究显示：各层电阻率的变化对MT/CSELF视电阻率的变化都有不同程度的贡献,贡献的大小与影响系数成正比,而各层影响系数都随电磁场源的周期变化;对于易受干扰的近地表层,其影响系数及对MT/CSELF视电阻率变化的贡献随周期的增加快速下降,在特定的短周期段只有近地表层对观测到的视电阻率变化有贡献而之下各层无贡献;近地表层之下各层的影响系数及对视电阻率变化的贡献则是随周期起伏变化;通过影响系数和各地层贡献分析,选择在合适的长周期段观测,可以使近地表层对视电阻率变化的贡献忽略不计,视电阻率变化主要反应深部各层的电阻率变化。研究结果对MT/CSELF观测频段的选择具有指导意义。
Abstract:
In order to study the change of resistivity of underground medium with time,for the horizontal layered uniform resistivity structure,the influence coefficients of apparent resistivity of MT/CSELF and the contribution of each layer to the change of apparent resistivity are studied. The research shows that: the change of the resistivity of each layer contributes to the change of the apparent resistivity of MT/CSELF in different degrees,the contribution is proportional to its influence coefficient,and the influence coefficient of each layer varies with the period of the electromagnetic field source;for near-surface layer which is susceptible to interference,its influence coefficient and contribution to the variation of apparent resistivity decrease rapidly with the increase of period,and in a certain short period range,only the near-earth surface contributes to the apparent resistivity,while the lower layers do not. The influence coefficients and the contributions to the change of the apparent resistivity of layers under the near-earth surface are fluctuated with the period. The contribution of near-surface layer to the apparent resistivity change can be neglected and the apparent resistivity change mainly reflects the resistivity changes of deep layers by choosing an appropriate long period range for observation through analysis of influence coefficients and contributions of each layer. The results of this study are instructive to the selection of observation frequency band of MT/CSELF.

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备注/Memo

备注/Memo:
收稿日期: 2020-02-10
基金项目: 云南省地震局科技人员传帮带培养项目“地电阻率台站前兆信息获取能力评价及其改进方法研究”（C3-201705）
作者简介:文雯（1982-）,女,工程师,主要从事地震活动性、地震电磁学等方面的研究工作。
E-mail: 54549099@qq.com
通信作者:毛先进（1962- ）,男,正研级高级工程师,主要从事地震电磁学及工程地球物理勘探研究。
E-mail: maoxj87@163.com
更新日期/Last Update: 2020-12-20