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北京一地连续2年地震 当地居民:山挖空了早习惯了
2017-08-29 23:50:27 中国青年网
两年前也曾发生地震 系采空区正常现象
而据国家地震台网介绍,2016年4月19日,几乎在同一位置——房山区大安山乡,也发生过一次塌陷,那次相当于2.7级地震。对此,房山区政府曾回应称,地震是因为煤矿采空区出现的塌陷地震。京煤集团相关负责人曾表示,该地震属于矿震,位于老旧采空区,属于生产过程中的正常现象。
时隔不到一年,房山大安山乡再次地震。
8月29日,房山区官方微博发出最新说明称,截止8月29日凌晨,经排查核实并走访周边村民,初步确认,没有发现人员伤亡和财产损失,该区域地表没有塌陷迹象、没有发生偷挖盗采行为、没有在建工程项目施工、没有其它地质灾害发生。
区国土分局等相关部门接到通知后赶往大安山进行现场勘察。地震具体原因有待专业部门进一步深入调查。
资料显示,地震按成因一般分构造地震、火山地震、塌陷地震、诱发地震和人工地震。其中,由人类生产生活引发的震动事件,称非天然地震,震源深度在地表附近,专业地震速报用0公里表达。
非天然地震的产生主要体现在地下深部采矿、大尺度的地表开发、高坝水库的注水、深部岩石中的流体充注,或大规模的地下爆破等方面,这类地震活动主要是触发了地质构造区内的预应力释放过程,通常表现为少震区内产生地震活动,或是地震活动区内地震活动的增加。
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