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2014年新疆于田MS7.3地震矩心矩张量快速测定
赵旭1,2)
1)中国地震台网中心, 北京市西城区三里河南横街5号 100045 / 2)中科院地质与地球物理研究所
摘要:
基于中国大陆中强震自动矩张量测定系统,采用虚拟中国地震台网记录的近震波形(震中距4o~12o),反演了新疆于田MS7.3地震的矩心矩张量。结果显示,地震发震断层面参数分别为走向243o/倾角70o/滑动角-18o,表现为1次左旋走滑为主兼有少量正倾滑分量的事件。 矩心在水平方向上位于震中(36.123oN,82.499oE )以东约13 km,矩心深度约10 km。总标量地震矩M0为3.05×1019N?m,换算成矩震级MW6.92,推断震源破裂时大部分能量释放的持续时间约14s。同时探讨了自动矩张量测定系统在未来地震灾情预判中的重要作用。
关键词:  W震相  矩心矩张量自动反演  于田地震
DOI:
分类号:
基金项目:
Rapid Determination of the Centroid Moment Tensor of the 2014 MS 7. 3 Yutian,Xinjiang Earthquake
Zhao Xu
Abstract:
We successfully employ an automatic centroid moment tensor(CMT) inversion system to infer the CMT solutions of the February 12,2014 MS7. 3 Yutian,Xinjiang earthquake using near-field seismic waveforms(4° < △ < 12°) observed by the virtual China seismic networks,which have been recently set up. The results indicate that this event occurred on a rupture plane ( strike 243°,dip 70°,and rake - 18°),showing left-lateral strike-slip faulting with a minor normal-faulting component. The centroid in the horizontal direction is located nearly 13km east of the epicenter (36. 123°N,82. 499°E),and the best-fitting centroid depth is around 10km. The total scalar moment,M0,is retrieved with an average value of 3. 05 × 1019 N·m,corresponding to moment magnitude MW 6. 92. Most of the energy is released within about 14s. Moreover,we discuss about the potential application of this system in earthquake disaster decision.
Key words:  W phase  Automatic centroid moment tensor inversion  Yutian earthquake