【摘要】 为了解地震孕育过程中地层应变的变化,我国建设了分量钻孔应变观测网.钻孔应变观测既可以观测到日月引潮力引起微弱的应变固体潮汐变化,也能记录应变突变事件.该钻孔应变台网最临近日本东海大地震的东北地区的两个位于大断裂旁的观测点,在9级地震发生前两年半和半年时,先后记录到地块岩石地层强烈受压事件,受压幅度达到10^-4应变量级.本文报告的这两次地层强烈受压事件,是首次观测到的地块边界地层应力剧增事件.日本东海大地震后GPS观测到我国东北地区发生向东数十毫米位移,表明9级地震与我国东北地区地块活动间存在联系.这两次强烈受压事件与中国大陆地块间相互作用和日本东海9级地震之间的关系成为值得探索的科学问题.更多还原

【Abstract】 To explore strain changes in earthquake preparation,China has built the network of component borehole strainmeters.Borehole strainmeters can observe solid tidal strain caused by tidal force of the Sun and the Moon,and also to observe other strain changes.In Northeast China,two borehole strain stations locating at borders of two big faults,which are closest to the epicenter of Tokai Mega-quake,respectively,in two and a half and half a year before the M9 earthquake,has recorded strong pressure on the rock formation at the border of land block,the pressure reached 10^-4 strain magnitude.Such huge strain accumulation was never observed before.After Tokai Mega-quake, GPS observed dozens of millimeters topography eastward displacement in Northeast China,that means the land block in Northeast China Does have a close relation with the M9 Tokai Mega-quake.The interaction between these two events of strong compression and Tokai M9 carthquake is a scientific issue worth further exploring.更多还原