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中科大:朝鲜此次核爆威力是长崎原子弹3至7.8倍
2017-09-04 13:32:53 中国科学技术大学
中国科学技术大学地震与地球内部物理重点实验室温联星教授课题组根据分析地震仪观测记录,确认朝鲜于北京时间2017年9月3日11时30分(当地时间12时)在其丰溪里核试验基地进行了一次地下核试验。研究表明,朝鲜2017年9月3日核爆位于北纬41度17分53.52秒、东经129度4分27.12秒,定位误差为100米,与其在2016年9月9日、2016年1月6日、2013年2月12日和2009年5月25日举行的核爆位于同一座山下。此次核爆当量为108.3±48.1千吨,高于朝鲜历届核爆。其中,2016年9月9日核爆当量为17.8±5.9千吨,2016年1月6日核爆当量为11.3±4.2千吨,2013年2月12日核爆当量为12.2±3.8千吨,而2009年5月25日核爆当量则为7.0±1.9千吨。此次核爆的威力已达到了美国1945年投放在日本长崎的“胖子”原子弹威力的3至7.8倍。
(左)朝鲜2017年9月3日核爆定位位置(五角星标记为2017/09/03)相对于其2016年9月9日的核爆位置(五角星标记为2016/09/09),及其定位误差(椭圆)。(右)Google地图中朝鲜2017年9月3日及其历次核爆的位置(红圈),引爆时刻(红标志)和当量(蓝标志)。
中国科大研究利用朝鲜2016年9月9日的核爆产生的地震波波形,消除了地震波在地球内部传播时间的计算误差,使定位达到了前所未见的精度。在精确定位的基础上,研究组利用卫星图像和高程数据确定了朝鲜2017年9月3日核爆的埋藏深度,利用1300公里内中国区域台网的112个地震台资料估算了当量及其误差。至此,中国科大地震实验室的高精度定位系统已精确地确定了朝鲜自2006年10月第一次核试验以来的历次核爆地点,揭示了朝鲜丰溪里核爆基础设施的地理网络分布。
朝鲜六次核爆的地点(红色五角星),用于该研究的地震台站分布(三角形)以及2016/09/09和2017/09/03年两次核爆的地震波波形。
责任编辑:孙启浩 CN037、李皓 CN002
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