与气压有关的地电场特征及机理研究

李学波; 卫定军; 李学涛; 罗龙

doi:10.11939/jass.20210127

与气压有关的地电场特征及机理研究

doi: 10.11939/jass.20210127

1.
中国银川 750001 宁夏回族自治区地震局
2.
中国银川 750002 宁夏自然资源资产统计核算中心

基金项目: 宁夏自然科学基金（2021AAC03484）和地震科技星火计划（XH20065Y，XH20064）共同资助

详细信息

通讯作者:
李学波，本科，工程师，主要从事地震电磁观测与研究，e-mail：137020898@qq.com

中图分类号: P319.1^＋1
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- 文章访问数: 46
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- PDF下载量: 19
- 被引次数: 0
出版历程
- 收稿日期: 2021-07-25
- 修回日期: 2022-05-06
- 网络出版日期: 2022-12-13
- 刊出日期: 2023-01-17

Feature and mechanism of geoelectric field related to atmospheric pressure

1.
Earthquake Agency of Ningxia Hui Autonomous Region，Yinchuan 750001，China
2.
Ningxia Natural Resources Assets Statistical Accounting Center，Yinchuan 75002，China

摘要

摘要: 使用宁夏四个地电台站记录的地电场数据，研究其变化特征、频谱特征、与区域气压变化的关系及测量方向与附近断裂走向的关系。研究结果显示：部分地电场具有日变化特征，同时也具有气压非周期性变化特征，这种特征与气压变化呈负相关，当场地裂隙优势方位与附近断裂带方位呈近似垂直或较大夹角时，测向与附近断裂走向近垂直的地电场与气压相关性较高。分析认为地电场具有气压非周期变化特征是因为测量位置基岩孔隙的渗透率与附近断裂裂缝的渗透率不同，流体渗流过程中气压系统变化引起的流体“窜流”所致。
- 地电场 /
- 气压 /
- 非周期 /
- 变化特征
Abstract: Using the geoelectric field data recorded by four geoelectric stations in Ningxia, the variation characteristics, spectral characteristics, the relationship with regional pressure variation, and the relationship between the measuring direction and the strike of nearby faults are studied. The research results show that part of the geoelectric field has diurnal variation characteristics, and also has the characteristics of non-periodic variation of atmospheric pressure, which is negatively correlated with the variation of atmospheric pressure, and the correlation is related to the angle between the measuring direction and the strike of nearby faults. It is considered that the geoelectric field has the characteristics of non-periodic change of atmospheric pressure is caused by the fluid “channeling” resulting from the change of air pressure system in the seepage process, which is due to the permeability difference between the bedrock pores and the nearby fault fractures.
- geoelectric field /
- atmospheric pressure /
- non-periodic /
- variation characteristics

HTML全文

图 1 海原、固原地电台站分布及布极图

Figure 1. Distribution and electrodes layout of Haiyuan and Guyuan geoelectric station

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图 2 海原（a）、固原（b）地电场变化特征

左侧为月变化；右侧为日变化

Figure 2. Variation characteristics of geoelectric field in Haiyuan （a） and Guyuan （b）

Left column stands for monthly variations and right column stands for diurnal variations

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图 3 2019年10月海原（a）和固原（b）北南向/北东向地电场、气压、钻孔应变及温度曲线

Figure 3. Haiyuan （a） and Guyuan （b） north-south or north-east or geoelectric field，borehole strain，atmospheric pressure and temperature curves in October 2019

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图 4 2019年10月海原（a）、固原（b）地电场与气压整点值

Figure 4. Hourly value of geoelectric field and atmospheric pressure in Haiyuan （a） and Guyuan （b） in October 2019

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图 5 2018—2020年海原北南向（左）和固原北东向（右）地电场

Figure 5. Geoelectric field of Haiyuan north-south （left） and Guyuan north-east （right） from 2018 to 2020

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图 6 2018—2020年海原北南向地电场（a）、北南向浅层视电阻率（b）、温度（c）及气压（d）

Figure 6. The north-south geoelectric field （a），north-south shallow apparent resistivity （b），temperature （c） and pressure （d） in Haiyuan from 2018 to 2020

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图 7 海原北南向地电场频谱图

Figure 7. Spectrum of Haiyuan north-south geoelectric field

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图 8 石嘴山地电台和银川地电台的分布（a）及其2019年10月各测向地电场与气压整点值（b）

Figure 8. Distribution of Shizuishan and Yinchuan geoelectric station （a） and their hourly values of geoelectric field and atmospheric pressure in October 2019 （b）

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图 9 地电场测量方向、场地裂隙优势方位及附近断裂走向示意图

Figure 9. Schematic diagram of geoelectric field measurement direction，dominant orientation of site fissures and nearby fault strike

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图 10 含裂缝和孔隙的双重介质示意图（a）、剖面图（b）及地电场测量方向与断裂走向关系示意图（c）

Figure 10. Schematic diagram of dual medium with fractures and pores （a），profile （b） and relationship between geoelectric field measuring direction and fault （c）

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表 1 海原和固原各测向地电场与气压的月相关系数

Table 1. Monthly correlation coefficient between geoelectric field and atmospheric pressure in Haiyuan and Guyuan

年-月	相关系数					年-月	相关系数
	海原		固原				海原		固原
	北南	东西	北南	东西	北东		北南	东西	北南	东西	北东
2018-01	−0.66	0.00	−0.36	−0.52	0.67	2019-01	−0.83	−0.11	−0.42	−0.63	0.75
2018-02	−0.77	0.12	−0.29	−0.07	0.64	2019-02	−0.76	−0.04	−0.22	−0.26	0.62
2018-03	−0.75	−0.21	−0.21	−0.62	0.52	2019-03	−0.73	−0.02	−0.27	−0.38	0.26
2018-04	−0.86	−0.16	−0.31	−0.56	0.19	2019-04	−0.71	−0.03	−0.25	−0.06	0.34
2018-05	−0.77	−0.19	−0.32	−0.59	0.57	2019-05	−0.83	0.23	−0.41	−0.54	0.42
2018-06	−0.76	0.10	−0.08	−0.46	−0.01	2019-06	−0.73	−0.07	−0.22	−0.21	0.46
2018-07	−0.58	−0.06	−0.30	−0.19	0.6	2019-07	−0.45	0.02	−0.06	−0.03	0.47
2018-08	−0.89	0.00	−0.35	−0.55	0.82	2019-08	−0.69	0.13	−0.02	−0.39	0.44
2018-09	−0.54	−0.05	−0.18	−0.65	−0.06	2019-09	−0.61	0.26	−0.14	−0.66	0.57
2018-10	−0.75	0.09	−0.24	−0.78	0.3	2019-10	−0.82	0.25	−0.33	−0.43	0.74
2018-11	−0.81	0.17	−0.41	−0.58	0.7	2019-11	−0.83	0.35	−0.61	−0.36	0.81
2018-12	−0.65	0.17	−0.43	−0.72	0.81	2019-12	−0.76	0.63	−0.50	−0.78	0.83

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表 2 海原和固原各测向地电场与气温的月相关系数

Table 2. Monthly correlation coefficient between geoelectric field and temperature in Haiyuan and Guyuan

年-月	相关系数					年-月	相关系数
	海原		固原				海原		固原
	北南	东西	北南	东西	北东		北南	东西	北南	东西	北东
2018-01	0.46	0.15	0.20	0.39	−0.47	2019-01	0.35	0.25	0.30	0.27	−0.42
2018-02	0.48	−0.22	0.08	−0.28	−0.48	2019-02	0.35	−0.01	0.14	0.20	−0.24
2018-03	0.33	−0.21	0.11	−0.15	−0.33	2019-03	0.33	−0.17	−0.06	−0.27	−0.45
2018-04	0.50	−0.07	0.10	0.27	−0.06	2019-04	0.34	−0.06	0.00	−0.13	−0.46
2018-05	0.38	−0.15	−0.02	0.16	−0.42	2019-05	0.28	−0.01	0.03	0.05	−0.47
2018-06	0.09	−0.30	−0.22	0.20	−0.04	2019-06	0.12	−0.17	−0.25	−0.02	−0.48
2018-07	0.00	−0.27	0.09	−0.16	−0.23	2019-07	0.00	−0.23	0.13	0.27	−0.49
2018-08	0.17	−0.08	−0.22	0.25	−0.41	2019-08	0.34	−0.25	0.01	0.25	−0.50
2018-09	0.20	−0.01	−0.18	0.47	0.07	2019-09	0.32	−0.22	0.08	0.28	−0.51
2018-10	0.20	−0.04	0.03	0.01	−0.30	2019-10	0.23	−0.07	0.10	0.14	−0.52
2018-11	0.36	0.01	0.26	0.08	−0.50	2019-11	0.40	−0.07	0.22	0.47	−0.53
2018-12	0.52	−0.11	0.32	0.29	−0.57	2019-12	0.40	−0.10	0.29	0.06	−0.54

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表 3 2019年7—12月海原、固原、银川和石嘴山电台各测向地电场与气压相关系数以及各测向与附近断裂走向的夹角

Table 3. Correlation coefficients between geoelectric field and atmospheric pressure in Haiyuan，Guyuan，Shizuishan and Yinchuan geoelectric stations from July to December in 2019 and the angles between each measuring direction and the strike of nearby faults

台站	测向	相关系数							夹角/°
台站	测向	7月	8月	9月	10月	11月	12月	平均值	夹角/°
海原	NS	0.45	0.69	0.61	0.82	0.83	0.76	0.69	70
海原	EW	0.02	0.13	0.26	0.25	0.35	0.63	0.27	20
固原	NS	0.06	0.02	0.14	0.34	0.61	0.50	0.28	40
	EW	0.03	0.39	0.66	0.44	0.36	0.78	0.44	50
	NE	0.47	0.44	0.57	0.75	0.81	0.83	0.65	85
银川	NS	0.11	0.32	0.01	0.03	0.02	0.50	0.17	0
	EW	0.13	0.37	0.67	0.21	0.19	0.47	0.34	90
	NE	0.01	0.40	0.31	0.06	0.20	0.04	0.17	45
石嘴山	NS	0.25	0.25	0.51	0.10	0.30	0.43	0.31	15
	EW	0.19	0.27	0.70	0.56	0.28	0.56	0.43	75
	NW	0.12	0.68	0.66	0.43	0.53	0.61	0.51	60

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表 4 各台站主压应力方向、裂隙优势方位角及各测向与附近断裂走向的夹角

Table 4. Principal compressive stress direction and dominant fracture azimuth of each station and the angle between each measuring direction and the strike of nearby faults

	主压应力方向/°	裂隙优势方位角/°	附近断裂走向/°	地电场测向与附近断裂走向夹角/°
	主压应力方向/°	裂隙优势方位角/°	附近断裂走向/°	NS	EW	NE
海原	60	71	290	70	20
固原	60	12	320	40	50	85
银川	42	16	0	0	90	45
石嘴山	26	28	15	15	75	60 （NW）

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