基于海拉尔台阵资料的爆炸事件震级测定和当量估计  

Magnitude measurement and explosive yield estimate using the data of Hailar seismic array

作　　者：王志宇 郝春月[1] Wang Zhiyu;Hao Chunyue(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

机构地区：[1]中国地震局地球物理研究所,中国北京100081

出　　处：《地震学报》2023年第6期1079-1090,共12页Acta Seismologica Sinica

基　　金：地震台阵认证后数据管理与分析(2017-1892).

摘　　要：2016年1月6日、2016年9月9日和2017年9月3日在东北亚地区发生了三次爆炸事件。使用海拉尔地震台阵资料,拾取该三次爆炸事件的P波和Lg波的振幅,计算振幅谱、测量震级并估计当量。振幅拾取和振幅谱计算结果表明,使用Lg波第三峰值振幅方法计算三次事件的短周期体波震级mb(Lg),结果依次为4.33±0.05,4.56±0.4和5.60±0.03。2017年事件的Lg波的低频成分比前两次事件的更为发育,振幅相对更大,这种现象可能是由2017年事件的爆炸破坏机制或爆炸技术流程不同所致。采用新的国家标准计算短周期体波震级mb(P),三次爆炸事件的震级依次为5.3±0.1,5.6±0.1和6.1±0.1。将mb(P)和mb(Lg)通过震级-当量经验公式计算得到的当量结果平均值作为最终当量结果,则三次事件的爆炸当量依次为(14.4±4.3),(34±11.6)和(190.4±45.4)kt,2017年爆炸事件能量约为2016年9月事件的5.6倍,约为2016年1月事件的13.2倍。There were three explosions occurred in northest Asia on January 6,2016,September 9,2016,and September 3,2017.Using the data of Hailar seismic array,the amplitudes of P-phase and Lg-phase of the three explosions were picked up,the amplitude spectrum were calculated,the magnitude were measured,and the yield were estimated.The results of amplitude picking and amplitude spectrum calculation show that the low-frequency component of Lg-phase for the 2017 event is more developed than those of the previous two,and the amplitude is relatively larger,which is inferred to be related to the explosion damage mechanism or explosion technical process.The short-period body wave magnitude mb(P)calculated by using the national standard for the three explosions are 5.3±0.1,5.6±0.1 and 6.1±0.1,respectively.The short-period body wave magnitude mb(Lg)calculated by using the third peak method of Lg-phase for the three explosions are 4.33±0.05,4.56±0.4和5.60±0.03,respectively.The average yield results obtained by mb(P)and mb(Lg)through the magnitude-yield empirical formula were taken as the yield results of the three events,which were(14.4±4.3),(34±11.6)and(190.4±45.4)kt,respectively.The energy of the explosion event in 2017 was 5.6 times as much as that of the event in September 2016 and 13.2 times that of the event in January 2016.

关 键 词：海拉尔台阵 爆炸事件 当量估计 振幅谱 LG波 体波震级 

分 类 号：P315.3[天文地球—地震学]