中国历史上一次可能的慢地震——1597年10月6日渤海地震a

万历二十五年八月二十六日(公元1597年10月6日)在中国东部七个省记载了一次特殊的地震事件,事件的中心大致在渤海湾。 其特殊性表现在:1.影响范围大而各地的震动程度基本相同,2.没有记载房屋破坏和强烈的振动感觉,而伴随有地表水和地下水的活动,3.某些地方有地面裂缝,4.当天和第三天分别在中国长白山和朝鲜咸镜道发生火山喷发。 由历史记载表明,该事件引起的地震动具有丰富的长周期成份,可能为慢地震事件。 这次事件发生在1556年关中大地震后,这次事件以后的100多年华北紧接着发生4次M8级的大地震。是否它是十七世纪华北大地震活动高潮来临前的预兆,值得重视。 

A POSSIBLE HISTORICAL SLOW EARTHQUAKE IN EASTERN CHINATHE OCT. 6, 1597 BOHAI EARTHQUAKE

A peculiar seismic event occurred on Oct. 6,1597,which was widely reported in the historical documents of 7 provinces of eastern China. It has been inferred that the event was centralized in the Gulf of Bohai.It's notable features were:1.The area affected was very large,and everywhere was quite similarly shaken;2.No builing damage was reported,nor strongly felt shaking,but significant motion of both surface and underground water were widely recorded;3.Surface fissires appeared in some places;4.Volcanic eruptions which are thought to be probably related to the event,took place on the same day and the third day (Oct. 8) in the Changbai mountain area of China and Xianjindao of nothern Korea.Study of historical records leads to the impression that the ground shaking caused by the event had abundant long period components,and the event itself is likely to be a slow eathquake.