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《Chinese Journal of Geophysics》 2018-03
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The seismic characterization of North Korea underground nuclear tests

XIE XiaoBi;ZHAO LianFeng;Institute of Geophysics and Planetary Physics,University of California at Santa Cruz;Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics, Chinese Academy of Sciences;Institutions of Earth Science,Chinese Academy of Sciences;  
Since 2006,North Korea(DPRK)conducted 6 underground nuclear tests at the test site located near the China-North Korea border.These explosions generated abundant broad band digital seismograms within regional distances.These seismograms show typical features of shallow explosions.Processing methods for event discrimination,yield estimation,and relocation of epicenters were developed to investigate these explosions.The spectral ratios Pg/Lg,Pn/Lg,and Pn/Sn were calculated for all 6 explosions and 4 nature earthquakes.The results show that network averaged P/S type spectral ratios can unambiguously separate explosions from natural earthquakes.With this method,a regional network can effectively monitor nuclear tests of 0.5 kt or larger in the Korea Peninsula.The results also revealed that the mb-MS magnitude ratio cannoteffectively discriminate the explosion and earthquake sources in this region.A body wave magnitude system based on regional phase Lg was created for the Northeast China-North Korea border region.Based on this method,the Lg wave magnitudes of these nuclear tests were calculated and their seismic yields were estimated ranging between 0.5 and 60 kt.Due to lack of depth of burial information,these yields may be underestimated.Further investigation of the depth effect on yield estimation is suggested.Using the location of the first nuclear test as a reference,the epicenters of other explosions were relocated using a high-precision relative location method.
【Fund】: 国家重点研发计划(2017YFC0601206);; 国家自然科学基金(41674060 41374065 41630210)资助
【CateGory Index】: P315.7
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