华南六级以上地震的强余震

THE STRONG AFTERSHOCK OF EARTHQUAKES ( Ms≥6) IN SOUTH CHINA

本文总结了近100年来华南地区的4次M≥6级地震的余震资料,从工程抗震实用性的角度研究了余震衰减序列中各阶段最大震级的变化特点,从而得到:1)华南地区6级以上地震的余震平均每14—15年衰减一级;2)一次6级左右地震的余震活动经45年后即可恢复到当地正常小震活动背景水平。

This paper sums up the aftershock data of four earthquakes (Ms≥6) in recent 100 years in South China area and studies the changing characters of the largest magnitude about the aftershock attenuation sequi-ency in every period from the angle of paracticality of engineering antivi-bration.Some conslusions are drawn as following: 1.The aftershock of earthquakes ( Ms≥6 ) in South China area attenuate one degree at per 14 or 15 years. 2. After 45 years late, the aftershock activity of one earthquake about M=6 were quickly recovered to the normal level of small seismic activity in the locality.