继1980年在北京宣武门首次发现古地震遗迹之后,在三里河(木樨地大桥正北约100米处)开挖地下管道的人工剖面中,再次发现了古地震遗迹——砂土液化现象(图1)。该剖面为全新世地层,自上而下为:①人工填土,含有清代瓷片⑤ 2.5米②黄褐色亚粘土 1.3米③褐黄色细—中砂层,斜层理及交错层理十分发育,夹薄层亚粘土,含有小螺壳⑥唐代陶片⑤及砖块等 3.5米④砂卵石层 >2米 Following the first discovery of ancient earthquakes in Xuanwumen, Beijing, in 1980, the reappearance of the paleoearthquake - the phenomenon of liquefaction of the sand - was again found in the man-made section of the underground pipe that was excavated at Sanlihe (about 100 meters north of the Muxidi Bridge) 1). The profile is Holocene strata, from top to bottom: ① artificial fill, containing Qing Dynasty porcelain ⑤ 2.5 m ② brown sub-clay 1.3 m ③ brown yellow fine - the sand layer, oblique bedding and staggered bedding very Development, folder thin layer of sub-clay, containing a small screw shell ⑥ Tang pottery ⑤ and bricks and other 3.5 m ④ sand and pebble layer> 2 meters