【摘要】 以华北2组成组地震为例,分析了成组地震的异常特征。成组地震的异常特征主要表现为:(1)成组地震前兆异常时间跨度大,一般贯穿整个地震组始终,表现为长期的趋势异常。(2)成组地震前兆异常在大趋势背景下还会有小的阶段性波动,在每一次单一地震前又有新的响应。3)存在成组地震前兆异常的观测曲线在地震组开始前往往有较大转折或突跳变化。(4)不同学科成组地震前兆异常之间存在相关性。更多还原

【Abstract】 Based on two earthquake groups occurred in North China, the characteristic of precursory anomaly for earthquake group is analyzed. The characteristics of anomaly for earthquake group mainly are: (1) the temporal span of anomaly is large, and the anomaly, which behaves tendency anomaly, generally run through the whole earthquake group; (2) there are small fluctuations under the tendency background of the anomalies for earthquake group, which is new response for a single earthquake; (3) the figures that exists anomaly of earthquake group generally have large turning or kick before the beginning of a group; (4) there is usually correlativity between the anomalies of different approaches更多还原