2020年新疆于田MS6.4地震和田台地电场异常的测道差异性

doi:10.12196/j.issn.1000-3274.2021.02.014

地震 ›› 2021, Vol. 41 ›› Issue (2): 180-189.doi: 10.12196/j.issn.1000-3274.2021.02.014

2020年新疆于田M_S6.4地震和田台地电场异常的测道差异性

王宇¹, 谭大诚^1,2, 邱大琼³, 张锋³, 陈亮³

1.中国地震局兰州地震研究所, 甘肃兰州 730000;
2.甘肃省地震局, 甘肃兰州 730000;
3.新疆维吾尔自治区地震局, 新疆乌鲁木齐 830011

收稿日期:2021-01-08 修回日期:2021-01-25 发布日期:2021-08-06
通讯作者: 谭大诚, 正研级高级工程师。 E-mail: tandc@gsdzj.gov.cn
作者简介:王宇(1993-), 男, 河北张家口人, 在读硕士研究生, 从事地震地电理论方法和预测研究。
基金资助:
中国地震局监测司2020年任务项目(zx1903006, zx2004002)

The Azimuth Difference of the Geoelectric Field Anomaly of Hetian Station in the 2020 Yutian M_S6.4 Earthquake, Xinjiang

WANG Yu¹, TAN Da-cheng^1,2, QIU Da-qiong³, ZHANG Feng³, CHEN Liang³

1. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;
2. Earthquake Administration of Gansu Province, Lanzhou 730000, China;
3. Earthquake Agency of Xinjiang Uygur Autonomous Region, Urumqi 830011, China

Received:2021-01-08 Revised:2021-01-25 Published:2021-08-06

摘要/Abstract

摘要： 和田地电场台站距离2020年6月26日于田M_S6.4地震震中约305 km, 该台不同方位测道之间相关系数均值在0.8左右, 应用多极距原理获知震前两月该台地电场数据中“近场”信息较复杂, 但具有一定程度的可靠性。计算该台不同极距测道的优势方位角α和不同方位测道间相关系数δ_NS/NW, 获知震前数月长、短极距α、 δ_NS/NW存在不同的异常现象。 2011—2019年, 和田台周边300 km范围发生了6次M_S5.0以上地震, 这种异常现象的差异具有类似特点。这反映出在同一场地, 地电场长、短极距观测装置对周边中强地震的映震能力可能存在差异性。

关键词: 2020年于田M_S6.4地震, 地电场, 多测道, 异常, 差异

Abstract: The Hetian geoelectric field station is located about 305 km away from the epicenter of the Yutian M_S6.4 earthquake on June 26, 2020. The mean value of the correlation coefficient between the stations in different azimuths is about 0.8. The multipole distance principle is used to obtain the geoelectric field of the station two months before the earthquake. The “near field” information from the data is more complex, but it has a certain degree of reliability. The dominant azimuth α of the station with different polar distances and the correlation coefficient δ_NS/NW between the different azimuths have been calculated, which indicates that there are different anomalies in the long and short polar distances α and δ_NS/NW several months before the earthquake. From 2011 to 2019, 6 earthquakes above M_S5.0 occurred in the 300 km area around Hotan Station, which has similar geoelectric abnormal phenomenon characteristics with the Yutian M_S6.4 earthquake. This reflects that at the same site, there may be differences between the long and short pole distance observation devices for geoelectric field monitoring on moderate and strong earthquakes.

Key words: the 2020 Yutian M_S6.4 earthquake, Geoelectric field, Multi-channel, Anomaly, Difference

中图分类号:

P315.7

王宇, 谭大诚, 邱大琼, 张锋, 陈亮. 2020年新疆于田M_S6.4地震和田台地电场异常的测道差异性[J]. 地震, 2021, 41(2): 180-189.

WANG Yu, TAN Da-cheng, QIU Da-qiong, ZHANG Feng, CHEN Liang. The Azimuth Difference of the Geoelectric Field Anomaly of Hetian Station in the 2020 Yutian M_S6.4 Earthquake, Xinjiang[J]. EARTHQUAKE, 2021, 41(2): 180-189.

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2020年新疆于田M_S6.4地震和田台地电场异常的测道差异性

The Azimuth Difference of the Geoelectric Field Anomaly of Hetian Station in the 2020 Yutian M_S6.4 Earthquake, Xinjiang

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2020年新疆于田MS6.4地震和田台地电场异常的测道差异性

The Azimuth Difference of the Geoelectric Field Anomaly of Hetian Station in the 2020 Yutian MS6.4 Earthquake, Xinjiang

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2020年新疆于田M_S6.4地震和田台地电场异常的测道差异性

The Azimuth Difference of the Geoelectric Field Anomaly of Hetian Station in the 2020 Yutian M_S6.4 Earthquake, Xinjiang