地磁逐日比与新疆及周边地区强震关系

利用2009年1月1日至2019年12月31日新疆及周边区域12个地磁台站的地磁垂直分量日变幅数据,计算其日变幅逐日比,进而分析新疆及周边地区逐日比异常特征,研究其与磁暴和强震的关系.结果表明:强地震多发生在逐日比异常出现后半年,其中等待时间最短为20天,等待时间最长为220天,震中多位于异常集中区域或异常分界线及附近...

Geomagnetic Day by Day Ratio and Its Relationship with Strong Earthquakes in Xinjiang and Its Adjacent Areas

Daily variation of geomagnetic vertical component has important position in the study of earthquake precursor analysis. The variation magnetic field makes an induced magnetic field because of the Earth, conductivity, and the induced magnetic field includes the information not only from the outer magnetic field but also about the electrical conductivity of underground. The Earth's magnetic field geomagnetic vertical component reflects more changes of underground activity than other components. The method of day by day ratio with amplitude of geomagnetic vertical component is based on this theory. Because of this, This paper calculates the daily ratio of daily amplitude of geomagnetic vertical component by using the data at stations in Xinjiang and its surrounding areas, analyzes the characteristics of daily ratio and the earthquake cases in Xinjiang and its surrounding areas, analyzes the characteristics of daily ratio and the earthquake cases in north-south seismic belt. Opposed-phase induced magnetic field on opposite sides of the current was caused by daily ratio anomalies induced by underground current, and this formation mechanism is similar with the geomagnetic low point displacement anomaly. The study strengthened the reliability of using the method of day by day ratio to judge earthquake geomagnetic precursory anomaly information.