福建省内陆4.5级以上地震前的时空异常特征

Characters of space-time anomaly before M≥4.5 earthquakes in the inland of Fujian Province

分析讨论了福建省内陆龙岩—永安交界区1992年以来发生的3次4 5级以上地震前BP、C、D、GL和YH共5个地震活动性参数的时空扫描图像,发现这5个地震活动性参数的时空扫描图像在地震前确有异常存在。在同一地震前,5个地震活动性参数空间扫描图像的异常起始时间具有较好的同步性;异常出现后,主震最快在1年3个月发生,最迟在2年3个月发生;未来主震都发生在异常达最大面积时的区域内;未来主震震级与异常持续时间和异常最大面积存在一定的正相关关系。

By analyzing the space-time images of 5 seismicity parameters BP、C、D、GL and YH before three M≥4.5 earthquakes since 1992 in the inland of Fujian Province near the border of Longyan and Yongan,the authors find that 5 parameters of anomaly obviously existed before these earthquakes.Before the same earthquake,the anomalous initial time of 5 seismicity parameters had good simultaneity.After the anomalies appearing, main shock occurred in the 1 year 3 months at the shortest while main shock occurred in the 2 years and 3 months at the longest.The epicenters of future main shock located within the region that anomalies reached the biggest value.There was the positive correlation between the magnitudes of main shock and the duration time and the biggest area of anomaly.