Abstract: The wide angle reflection/refraction data obtained from the Wenan-Datong-Daihai deep seismic sounding profile are studied in detail. The results indicate that the crust thickness in the investigated region increases from 36.0km in the area of Taihang Moutain to 44.0km in the Shanxi plateau. Under the basement faults near the foot of Taihang mountain,the Zijingguan fault and east to Datong basin there is a fault zone which stretches to Mohodiscontunity. The seismic velocity of the upper mantle in Taihang uplift region is much higher and a very strong reversion of seismic velocity lies in the lower part of the upper crust in the Datong seismic zone and the region neighbouring the foot of Taihang mountain. Beneath the frontal zone of the Taihang mountain exists the deep structure condition for potential earthquakes.

Key words: Seismic sounding, Velocity structure, Crustal structure, Shanxi

摘要： 对自河北文安经山西大同至内蒙古岱海的宽角反射/折射地震剖面资料进行了详细的研究。结果表明,地壳厚度由太行山山前地带的36.0km向山西高原增厚至44.0km。在太行山山前基底断裂、紫荆关断裂的下方和大同盆地的东侧存在着延伸至莫霍面的断裂带;太行山隆起区上地幔顶部的速度偏高,太行山山前地带和大同震区上地壳的下部有强烈的速度反转,大同地震与这里的异常的壳幔构造有关,太行山山前地带存在着发生潜在地震的深部构造条件。

关键词: 地震测深, 速度结构, 地壳构造, 山西