地磁低点位移异常类型特征与地震活动

Type characteristics of geomagnetic low-point displacement anomaly and their relation to seismicity

通过对大量的地磁低点位移异常震例研究 ,结果表明 :1地磁低点位移异常的形态、空间展布有明显的地区特征。异常大致可分为 :大范围异常和区域性异常二大类 ,还可细分为 5个类型 ;2地磁低点位移异常与我国的地质活动构造有较密切的联系。异常范围的大小、形态与异常所在地区的活动构造的规模、展布形态特征 ,以及这一地区即将发生的地震强度有关。

Having studied many earthquake cases in which the geomagnetic low point displacement anomaly occurred, the research results show that ① The shape and spatial distribution of anomalies have evident regional characteristics. The authors divided the anomalies into two types: anomaly in large area in China or in some region. It can also be divided elaborately into six subtypes. ② There is close relation between the geomagnetic low point displacement anomalies and active tectonics zones. The area and the shape of anomalies are relative to the spatial distribution characteristics of active tectonics zones and the strength of the coming earthquakes in the region where anomalies occur.