论文部分内容阅读
本文采用和达法求宁夏五个区的虚波速度,并用各区虚波速度求得1460次地震震源深度,由这些深度的空间分布看出,宁夏地区震源深度由南向北逐渐加深,但几个地震集中的地区各有不同。西海固地区震源分布近似椭球形区域,在15～20公里处夹有不规则的间断面;吴银地区呈现出一条沿北东方向延伸的震源带;吴忠向马三湖地区有一逐渐加深的倾斜带;石咀山及以北地区多为连续的层状分布。由银川至石咀山一线向西北方向展布出一条倾斜面,在该面上有一小震空区。本文还对形成以上震源分布的力源情况进行了初步的讨论。
In this paper, the virtual wave velocity of five areas in Ningxia was obtained by the method of reachable, and the focal depth of 1460 earthquakes was obtained by the velocity of each wave in each area. From the spatial distribution of these depths, the focal depth of the area in Ningxia deepened gradually from south to north, The areas where the earthquakes concentrate are different. In the Xihaigu area, the distribution of source distribution is similar to the ellipsoid area, and there is an irregular cross-section between 15 and 20 km. The Wuyuan area presents a source belt extending along the NE direction. Wuzhong has a gradually deepening slope to the Maanshu area Belt; Shizuishan and north of the area for the continuous layered distribution. From Yinchuan to Shizuishan line to the northwest direction of the distribution of a sloping surface, there is a small surface in this area. This paper also made a preliminary discussion on the source of force that formed the above source distribution.