吴利军,刘爱春,田明,等. 北京沙河观测井水温地震异常特征[J]. 华北地震科学,2022, 40(3):69-75. doi:10.3969/j.issn.1003−1375.2022.03.011.
引用本文: 吴利军,刘爱春,田明,等. 北京沙河观测井水温地震异常特征[J]. 华北地震科学,2022, 40(3):69-75. doi:10.3969/j.issn.1003−1375.2022.03.011.
WU Lijun,LIU Aichun,TIAN Ming,et al. Analysis and Discussion on Anomalous Seismic Anomaly Characteristics of Water Temperature in Beijing Shahe Well[J]. North China Earthquake Sciences,2022, 40(3):69-75. doi:10.3969/j.issn.1003−1375.2022.03.011.
Citation: WU Lijun,LIU Aichun,TIAN Ming,et al. Analysis and Discussion on Anomalous Seismic Anomaly Characteristics of Water Temperature in Beijing Shahe Well[J]. North China Earthquake Sciences,2022, 40(3):69-75. doi:10.3969/j.issn.1003−1375.2022.03.011.

北京沙河观测井水温地震异常特征

Analysis and Discussion on Anomalous Seismic Anomaly Characteristics of Water Temperature in Beijing Shahe Well

  • 摘要: 沙河观测井水温自观测以来记录到多次异常变化,为探究其成因,利用FFT和S变换方法对观测数据进行分析发现,数据异常变化与未来3个月内附近断层5 km范围内的微震和200 km范围内的中强地震有很好的对应关系,说明该井水温观测具有较好的震前异常响应特征。研究结果表明,引起沙河井水温数据异常主要为低频波和日潮产生的能量,多次震前数据加速变化过程中和急速变化后受日潮影响显著,甚至出现了日潮形态,可将此特征作为该井水温数据异常判定指标之一。

     

    Abstract: Several abnormal changes of water temperature in Shahe observation well have been recorded since the observation. In order to explore the causes, FFT and S transformation methods are used to analyze the observed data. It is found that there is a good correspondence between the abnormal data changes and the microearthquakes within the range of 5km and the medium-strong earthquakes within the range of 200 km of the nearby faults in the next three months, indicating that the water temperature observation of the well has a good pre-earthquake abnormal response characteristics. The results show that the low frequency wave and diurnal tide are the main causes of the abnormal water temperature data. In addition, the diurnal tide has a significant influence on the data in the process of accelerated change before multiple earthquakes and after rapid change, and even appears the diurnal tide shape, which can be taken as one of the indicators to determine the abnormal water temperature data of the well.

     

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