刘俊清^1,2,,
刘财^1,,,
张宇²,
邓馨卉¹
1. 吉林大学地球探测科学与技术学院, 长春 130026
2. 吉林省地震局, 长春 130117

基金项目: 国家自然科学基金项目（41430322，41404090）联合资助


详细信息

作者简介: 刘俊清, 男, 1977年生, 高级工程师, 博士, 吉林省地震局工作, 主要从事地震、火山监测预报研究.E-mail:woxin5295@yahoo.com

通讯作者: 刘财, 1963年生, 吉林农安人, 教授, 博士生导师, 主要从事信号处理与分析和勘探地震学研究.E-mail:liucai@jlu.edu.cn

中图分类号: P315

收稿日期:2017-11-23
修回日期:2018-05-16
上线日期:2019-02-15

The moment tensor of M_L3.4 earthquake on September 23, 2017, Democratic People's Republic of Korea (DPRK)

LIU JunQing^1,2,,
LIU Cai^1,,,
ZHANG Yu²,
DENG XinHui¹
1. College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China
2. Jilin Earthquake Agency, China Earthquake Administration, Changchun 130117, China


More Information

Corresponding author: LIU Cai,E-mail:liucai@jlu.edu.cn

MSC: P315

--> Received Date: 23 November 2017
Revised Date: 16 May 2018
Available Online: 15 February 2019


摘要
摘要:利用区域地震台网数字波形资料，对2017年9月23日朝鲜M_L3.4地震进行地震矩张量反演计算与参数稳定性评估，获得了此次地震的震源机制解.结果表明，地震矩心深度为3 km，标量地震矩为1.34×10¹⁴ N·m，矩震级为M_W3.4.地震矩张量结果分解后，双力偶分量（DC）为96.4%，补偿线性矢量偶极分量（CLVD）为-0.8%，震源体体积变化的各向同性分量（ISO）为-2.8%.主压应力P轴方位角为144°，倾角为74°，主张应力T轴方位角为341°，倾角为15°.其中一个节面的参数为：走向248°，倾向60°，滑动角-94°.地震震源体积变化分量很小，震源机制类型属于典型的由断层剪切位错引起的正断层型地震事件，且主张应力T轴方向与区域近地表应变率场方向一致.由于朝鲜2017年9月3日核试验释放的能量对局部区域应力场进行了扰动，致使核试验场附近地壳岩体处于破裂的临界状态，2017年9月23日朝鲜M_L3.4地震事件可能是区域应力场作用下的一次山体滑动事件.
关键词: 地震矩张量/
震源机制/
朝鲜核试验/
P波极性/
Jackknifing

Abstract:According to the China Earthquake Networks Center(CENC), an earthquake event occurred at Huataishan near the nuclear test site in Hamgyong of Democratic People's Republic of Korea (DPRK), with a focal depth of 0 km and a local magnitude of 3.4.It is important to determine the focal mechanism for further identifying it from underground nuclear test, natural earthquake, landslide and collapse.Based on the digital seismic data recorded on a regional network installed in Northeastern China, we investigated the focal mechanism for this event.The seismic moment tensor was determined with uncertainty estimation.The results show that the centroid depth is 3 km, the scalar seismic moment is 1.34×10¹⁴ N·m, and the moment magnitude is M_W3.4. The moment tensor solution was decomposed to DC (Double couple), CLVD(Compensated linear vector dipole) and ISO(Volumetric) components, and their values are 96.4%, -0.8% and -2.8%, respectively, where the volume component of seismic source body seems to be very small and was neglected in the solution.The azimuth and plunge of the principal compressive stress P axis are 144° and 74°, respectively.The azimuth and plunge of the principal tensile stress T axis are 341° and 15°, respectively.The strike, dip and rake are 248°, 60° and -94°, respectively.The focal mechanism can be characterized by double couple model as a normal faulting mechanism.The direction of the main tensile stress is in agreement with one of regional strain rate field near surface.The huge energy from the nuclear test on September 3, 2017 have disturbed the local crustal stress field.We suggested that the regional stress field triggered a natural event which may contribute to the M_L3.4 earthquake.
Key words:Seismic moment tensor/
Focal mechanism/
DPRK nuclear test/
P wave polarity/
Jackknifing



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