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2014年10月7日21时49分,云南省普洱市景谷傣族彝族自治县发生M_W6.2级地震.为了更好的认识本次地震的发震构造和震源运动学特征,我们利用IRIS上下载的远震P波数据和格点搜索的方法反演得到本次地震震源机制.为了对反演结果进行进一步验证,本文选用了当地台站提供的近震数据,利用双差定位的方法进行了重定位研究,地震重定位的结果和震源机制的反演结果有较好的一致性.反演结果得到节面1走向为240°,倾角87°,滑动角12°;节面2走向149°,倾角78°,滑动角177°.再结合双差定位后地震群的分布,最终确定节面2为本次地震的发震断层.对比之前云南地区断层分布推断本次地震的发震断层为新的隐伏断层.
At 21:49 on October 7, 2014, M_W6.2 earthquake occurred in Jinggu Dai Autonomous County, Pu’er City, Yunnan Province. To better understand the seismogenic structure and focal kinematic characteristics of this earthquake, The teleseismic P-wave data and lattice point search method were used to retrieve the focal mechanism of this earthquake.In order to further validate the inversion results, we selected the near-earth seismic data provided by the local stations and used double-difference positioning The results show that there is good agreement between the results of seismic relocation and the inversion results of focal mechanism.The results of inversion show that the heading of strike 1 is 240 °, dip 87 °, glide 12 °, knuckle 2 is 149 °, Inclination angle of 78 ° and sliding angle of 177 °, combined with the distribution of seismic groups after double-difference positioning, finally determine the seismogenic fault of this earthquakes in section 2. Compared with the previous fault distribution in Yunnan area, it is inferred that the seismogenic fault of this earthquake is new Hidden fault.