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我国大陆的强震(M≥6)活动具有成带分分布的特点。影响黄河流域中游区域稳定的地震带有:汾渭及银呼裂谷系地震带;太行深断裂系地震带;贺兰——六盘深断裂系地震带,见图1。这些地震带展布广,地震活动频繁、强烈、破坏性大,对区内国民经济建设和人民生命财产安全关系重大。中游区跨越我国两大区域构造应力场。贺兰——六盘深断裂以东为张应力场,属滨太平洋构造域;以西为压应力场,属特提斯——喜马拉雅构造域。其地震机制与活动特性迥然有别。本文仅对此加以讨论。
The strong earthquakes (M≥6) activities in mainland China have the characteristics of sub-distribution. Seismic belts that affect the stability of the middle reaches of the Yellow River Basin include the Fenghuai and Yinhuo rift seismogenic belt, the Taihang deep fault system seismic belt, the Helan-Liupanshui fault seismogenic belt, as shown in Figure 1. These seismic zones are widely distributed and their seismic activities are frequent, intense and destructive. They have a great bearing on the national economic construction and the safety of people’s lives and properties in the area. The middle reaches span two tectonic stress fields in China. Helan - the east of the Liupanshan fault is the tensile stress field and belongs to the foreland tectonic domain. To the west is the compressive stress field, belonging to the Tethyan-Himalayan tectonic domain. Its earthquake mechanism and activity characteristics are very different. This article only discusses this.