地震研究

2022年青海门源M_S6.9地震前地下流体异常特征分析

钟骏,冯晓博,王博,周志华,晏锐

(中国地震台网中心,北京 100045)

关键词：门源M_S6.9地震; 地下流体; 异常特征

Analysis on Anomalous Characteristics of Underground Fluid before the Menyuan,Qinghai M_S6.9 Earthquake in 2022

ZHONG Jun,FENG Xiaobo,WANG Bo,ZHOU Zhihua,YAN Rui

(China Earthquake Networks Center,Beijing 100045,China)

Keywords：the Menyuan M_S6.9 earthquake; underground fluid; anomalous characteristics

DOI: 10.20015/j.cnki.ISSN1000-0666.2022.0031

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参考文献

对2022年1月8日青海门源MS6.9地震前,震中附近地下流体观测资料及异常特征进行分析,结合震前预测过程进行了回顾性总结。结果表明:门源地震震中500 km范围内存在9项异常,其中8项为中短期异常,均出现在震前6个月; 异常在空间上分布不均匀,主要集中于震中南部200 km范围内; 本次门源地震与2016年门源MS6.4地震和2021年玛多MS7.4地震前的地下流体异常存在一定的相同性及差异性变化。

In this paper,the observational data and the anomalous characteristics of the underground fluid around the epicenter of the Menyuan MS6.9 earthquake on January 8,2022 are systematically analyzed,and the prediction process of this earthqake is retrospectively summarized.The results show that there are 9 anomalies within 500 km of the Menyuan epicenter,and 8 of them are medium-short term anomalies appearing 6 months before the earthquake.The anomalies are evenly distributed in space,mainly located within 200 km south of the Menyuan epicenter.There are similarities and differences on anomalous characteristics of the underground fluid between the 2022 Menyuan MS6.9 earthquake and the other two earthquakes,the 2016 Menyuan MS6.4 earthquake and the 2021 Maduo MS7.4 earthquake.

引言
1 观测资料及异常概述
2 异常特征分析
3 讨论
4 结论

图1 门源MS6.9地震前震中500 km范围内地质构造及地下流体观测台站和异常台站空间分布<br/>Fig.1 Geological structure map and spatial distribution of underground fluid observatories and anomalies within 500 km of the Menyuan MS6.9 earthquake

图1 门源MS6.9地震前震中500 km范围内地质构造及地下流体观测台站和异常台站空间分布
Fig.1 Geological structure map and spatial distribution of underground fluid observatories and anomalies within 500 km of the Menyuan MS6.9 earthquake

表1 门源MS6.9地震前震中500 km范围内地下流体异常基本信息<br/>Tab.1 Information of the underground fluid anomalies within 500 km of the Menyuan MS6.9 earthquake

表1 门源MS6.9地震前震中500 km范围内地下流体异常基本信息
Tab.1 Information of the underground fluid anomalies within 500 km of the Menyuan MS6.9 earthquake

图2 2022年门源MS6.9地震地下流体异常观测曲线<br/>Fig.2 Curves of the observed underground fluid anomalies of the Menyuan MS6.9 earthquake in 2022

图2 2022年门源MS6.9地震地下流体异常观测曲线
Fig.2 Curves of the observed underground fluid anomalies of the Menyuan MS6.9 earthquake in 2022

图3 不同震中距范围内的地下流体异常项数、观测项数及异常测项比<br/>Fig.3 Number of underground fluid anomalies,observation items and proportion of anomalies at different epicentral distances

图3 不同震中距范围内的地下流体异常项数、观测项数及异常测项比
Fig.3 Number of underground fluid anomalies,observation items and proportion of anomalies at different epicentral distances

图4 2022年门源MS6.9地震前地下流体异常时间进程<br/>Fig.4 Time process of underground fluid anomalies before the Menyuan MS6.9 earthquake in 2022

图4 2022年门源MS6.9地震前地下流体异常时间进程
Fig.4 Time process of underground fluid anomalies before the Menyuan MS6.9 earthquake in 2022

图5 2022年门源MS6.9地震前地下流体异常时空演化特征<br/>Fig.5 Characteristics of the temporal-spatial evolution of the underground fluid anomalies before the Menyuan MS6.9 earthquake in 2022

图5 2022年门源MS6.9地震前地下流体异常时空演化特征
Fig.5 Characteristics of the temporal-spatial evolution of the underground fluid anomalies before the Menyuan MS6.9 earthquake in 2022

表2 3次MS≥6.0地震前震中500 km范围内地下流体异常统计<br/>Tab.2 Statistics on underground fluid anomalies within 500 km before 3 MS≥6.0 earthquakes

表2 3次MS≥6.0地震前震中500 km范围内地下流体异常统计
Tab.2 Statistics on underground fluid anomalies within 500 km before 3 MS≥6.0 earthquakes

图6 3次MS≥6.0地震前震中距500 km范围内地下流体异常数量对比<br/>Fig.6 Quantitative comparison of the underground fluid anomalies within 500 km before 3 MS≥6.0 earthquakes

图6 3次MS≥6.0地震前震中距500 km范围内地下流体异常数量对比
Fig.6 Quantitative comparison of the underground fluid anomalies within 500 km before 3 MS≥6.0 earthquakes

图7 3次MS≥6.0地震前地下流体异常出现至发震时间与震中距的关系<br/>Fig.7 Relationship between the duration of underground fluid anomalies and the epicentral distance before 3 MS≥6.0 earthquakes

图7 3次MS≥6.0地震前地下流体异常出现至发震时间与震中距的关系
Fig.7 Relationship between the duration of underground fluid anomalies and the epicentral distance before 3 MS≥6.0 earthquakes

图8 2017-07—2022-01嘉峪关台气氡(a)和2008—2010年德令哈台水温(b)观测曲线及周边地震空间分布(c)<br/>Fig.8 The gas-radon curves at Jiayuguan station from Jul., 2017 to Jan.,2022(a),the water-temperature curves at Delingha station from 2008 to 2010(b),and spatial distribution of their surrounding earthquakes(c)

图8 2017-07—2022-01嘉峪关台气氡(a)和2008—2010年德令哈台水温(b)观测曲线及周边地震空间分布(c)
Fig.8 The gas-radon curves at Jiayuguan station from Jul., 2017 to Jan.,2022(a),the water-temperature curves at Delingha station from 2008 to 2010(b),and spatial distribution of their surrounding earthquakes(c)