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第一部分重点监视区中期综合分析预报工作一、确定重点监视区的方法及其判据1.地震活动性异常(1)地震活动的异常增强和异常平静1)大震前地震活动性的增强有两种形式①在未来大震的震中及其邻区(距大震震中200千米范围),大震发生前地震活动显著增强。这种增强现象一般不持续至大震发生,往往大震发生在峰值后的下降段。②在未来大震震中及其附近地区,地震活动并无明显增强,
Part One Comprehensive Monitoring and Prediction of Key Monitoring Areas I. Methods and Criteria for Determining Key Monitoring Areas 1. Abnormal Earthquake Activity (1) Abnormal Anomalies and Quiet Anomalies of Earthquake 1) Enhancement of Seismicity Before Earthquakes Yes Two Forms ① In the epicenter of the future earthquakes and its adjacent areas (200 km away from the epicenter of the epicenter), the seismic activity increased significantly before the earthquake occurred. This enhancement generally does not last until a major earthquake occurs, often after a peak in the down section of the earthquake. ② In the future earthquake epicenter and its vicinity, there is no obvious increase of seismic activity,