华北地区地下流体的两类短期前兆异常

TWO KINDS OF SHORT-TERM PRECURSOR ANOMALY OF UNDERGROUND FLUID IN NORTHERN CHINA

摘要:

系统分析了地下流体前兆异常变化与中强以上地震的关系,提出华北地区地下流体存在转折型短期异常和单一型短期异常.结合震例对这两类短期前兆异常的特征进行了分析.认为应特别注意研究预测区内的这两类群体异常的准同步变化特点.

Abstract:

Through systematic analysis on the relationship between the variation of precursor anomalies of underground fluid and moderate strong earthquakes, it is indicated that there are two kinds of short-term precursor anomaly of earthquake, which are turn style and single style, in Northern China. Based on the earthqauke cases, the characteristics of two kinds of precursor anomaly are discussed. It is considered that the approximately synchronous variation for two kinds of anomaly group in the reg ion should be given special attention to.