论文部分内容阅读
鄂尔多斯西缘构造带的基本格架是由纬向、经向构造、北北东向构造、北西—北北西向构造及弧形构造构成的。鄂尔多斯地块与西缘构造带以经向构造相隔。由于纬向构造的分割作用,将鄂尔多斯西缘构造带分成三段,即银川平原段(北段),中宁、中卫—天水段(中段),天水—武都段(南段)。这三个构造地震特征、新活动特点都存在着差异。本文重点阐明了鄂尔多斯西缘构造带的构造格架、地震构造特征、新活动特点、分段控震关系及控震机制、条件等问题。
The basic framework of the western Ordos belt is composed of latitudinal, meridional, north-north eastward, northwest-north-northwestward and arc-shaped structures. The Ordos block and the western margin are separated by meridional structures. Due to the division of zonal structure, the western margin of the Ordos belt is divided into three sections, that is, the Yinchuan Plain section (the northern section), Zhongning, Zhongwei-Tianshui section (middle section) and the Tianshui-Wudu section (the southern section). These three structural characteristics of the earthquake, there are differences in the characteristics of new activities. This article focuses on the tectonic framework of the western margin of the Ordos, the tectonic features of the tectonics, the characteristics of new activities, the relationship between the seismo-phased earthquakes and the mechanisms and conditions of seismic control.