内蒙古测震台网自"十五"数字化网络建成以来，一直使用华南速度模型。多年的大震速报和地震编目结果显示，华南速度模型不符合内蒙古地区的地质构造特征；2016年开始使用的内蒙古2015速度模型也不能完全满足内蒙古各区域地震定位的需求。本文对内蒙古地区2009~2016年记录的所有M_L ≥ 3.0地震震相数据利用速度拟合和折合走时方法，反演适合内蒙古西部、东部、中部各区域的分区地壳速度结构模型，并对西部速度模型、东部速度模型、中部速度模型进行应用对比分析。各分区的地壳速度模型定位误差较小，可靠性和稳定性优势明显。

Since the establishment of the Tenth "Five-year Plan" digital seismic network,the South China Speed Model has been used in Inner Mongolia Digital Seismic Network. The researches of large seismic velocity and seismic cataloguing in many years show that the speed model in South China does not conform to the characteristics of geological structure in Inner Mongolia. The 2015 speed model of Inner Mongolia used in 2016 could not fully meet the needs of seismic positioning in various regions of Inner Mongolia. In this paper,all the seismic phase data of M_L ≥ 3.0 recorded from 2009 to 2016 were used to invert the suitable models of regional crustal velocity structure for the western,eastern and central regions of Inner Mongolia by the way of velocity fitting and travel time reducing. At the same time,the models of western velocity,eastern velocity and middle velocity were compared and analyzed. The position error of the crustal velocity model of each subarea is smaller than before,and the advantages of its reliability and stability are obvious.

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内蒙古自治区科技重大专项"重点地区地震预测预警技术研究开发与推广示范"资助