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朝鲜3.4级地震系天然地震 推测为塌陷事件
2017-09-24 00:10:19 中国青年网
(原标题:研究快报:2017年9月23日朝鲜疑似爆炸事件地震学调查的初步结果)
中国地震台网测定:2017年9月23日16时29分在朝鲜(疑爆)发生3.4级地震,震源深度0千米,震中位于北纬41.36度,东经129.06度。鉴于可能的地下核试验对国际政治和中国周边安全方面具有重要影响,我们根据中国国家地震台网和全球地震台网的区域波形资料,对该事件的性质进行了快速的地震学鉴别。
图1将朝鲜6次地下核试验与2017年9月23日疑似爆炸事件在牡丹江地震台(MDJ)的地震记录进行了对比,发现波形相似度不高。P波与Lg波比较,能量相对较弱。S波不发育,3-5s范围内短周期Rayleigh面波能量相对较强,显示出显著的浅源特征。
图1朝鲜6次地下核试验和2017年9月23日朝鲜疑似爆炸事件在牡丹江地震台(MDJ)的重直分量速度记录。
为了区分核爆和天然地震,我们比较了此次事件、朝鲜地下核试验和邻近区域的4次天然地震的振幅特征。根据大陆路径台站的垂直位移记录,计算了Pg/Lg,Pn/Lg,和Pn/Sn的傅立叶频谱比,并用其台网平均值作为区分地震和核爆事件的依据。
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