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2014年5月云南省盈江县先后发生MS5.6、MS6.1地震,为确定它们的发震构造及其所反映的区域活动构造格局,笔者围绕该区开展了地震烈度调查、活动构造遥感解译、地质构造及构造地貌野外调查、震源机制解及余震分布资料分析等工作。调查与分析表明,两次地震的宏观震中均位于盈江县勐弄乡麻栗坡村附近,但发震断层明显不同。前者为NE走向左旋走滑的昔马—盘龙山断裂,后者为近SN向右旋走滑的苏典断裂。历史地震资料显示,盈江地区的地震活动多以5~6级的中-强震为主,并具有明显的群发性和沿SN向断层迁移的特征。在实皆断裂及滇西内弧带的共同作用下,腾冲地块内以大盈江断裂为界,北部主要发育近SN向右旋走滑断裂,南部则以NE向左旋走滑断裂为主,其中近SN向断层晚第四纪活动性更强。
In May 2014, there occurred successively MS5.6 and MS6.1 earthquakes in Yingjiang County, Yunnan Province. In order to confirm their seismogenic structures and tectonic patterns of regional activities reflected by them, the authors conducted seismic intensity surveys and remote sensing of tectonic activities Interpretation, geological survey of tectonic and tectonic geomorphology, focal mechanism solution and aftershock distribution data analysis. Survey and analysis show that the macro epicenters of the two earthquakes are all located near Malipo Village, Mengnong Township, Yingjiang County, but the seismogenic faults are obviously different. The former is the Xima-Panlongshan fault with NE going left-slip, while the latter is the Su-Dian fault with near-SN dextral strike-slip. Historical seismic data show that the seismic activity in the Yingjiang area is mostly dominated by moderate-strong earthquakes of grade 5 to 6 with obvious mass and characteristics of migration along the SN. Under the joint action of the Sagajie fault and the western Yunnan arc belt, the Tengchong block is bounded by the Dayingjiang fault, with the main SN dextral strike-slip faults in the north and the NE strike-slip strike-slip faults in the south , Of which late SN faulting is more active late Quaternary.