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青藏高原东北地区是青藏块体、阿拉善块体和鄂尔多斯块体的汇聚部位 .为探索该区的构造特征 ,结合地质构造绘出 4条剖面线 .对剖面两侧各 40 km范围内的 ML≥ 3.0及研究区范围内 ML≥ 4.0的 388次地震做了重新定位 .重新定位后 ,36%的地震震中变化达 5km以上 ;给出深度的地震数比重新定位前增加了 50 % .青藏高原东北地区似三联点构造区 ,历史上曾发生过 3次 8级以上大震 ,现今微震活动也很频繁 ,反映出青藏高原东北地区三大块体间的现代构造运动仍然十分强烈
The northeastern Qinghai-Tibet Plateau is the convergence site of the Qinghai-Tibet block, the Alashan block and the Ordos block. In order to explore the tectonic features of the area, four section lines are drawn with the geological structure. ≥3.0 and 388 earthquakes with ML≥4.0 in the study area were repositioned.After repositioning, 36% of the earthquakes changed more than 5km and the number of earthquakes with depth increased by 50% than that before repositioning.The Tibetan Plateau The northeastern region resembles the triple point tectonic zone. There have been three major earthquakes of magnitude 8 or above in history. The current microseismic activity is also frequent, reflecting that the modern tectonic movement between the three blocks in the northeastern Tibetan Plateau is still very strong