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中国大陆特别是华北及邻近区域内,曾多次发生7级以上强震,地震活动频繁.自 1966年以来,又连续发生了系列成串性强震.对于大面积的华北块体,对弱震能量、频度、小震群,以及b值等地震活动性,在统一应力场中成串性强震成因上的联系,巳有论述,运用板块构造学说,对我国境内地震发生的地质背景,亦有专门讨论.本文基于地震活动性,综合考虑地质构造条件,划出“蒙古发震块体”,用以解释华北北部地震发生的条件和活动方式,分析了蒙古发震块体内地震活动的特征及其地震趋势.二、蒙古发震块体的边界划分由地壳和上地幔组成的刚性岩石圈,因内力作用而断裂,形成若干块体,也有人提出地球的自转运动和重力、热力作用的原因,岩石因遭到破坏,形成许多断块.
A series of series of strong earthquakes have occurred continuously since 1966 in China, especially in the North China and its adjacent areas, with strong earthquakes of magnitude 7 or above occurred on many occasions. For the large area of North China block, Energy, frequency, small swarm swarm, and seismic activity such as b value have been discussed in this paper. The geological tectonics of earthquake in China have been discussed using plate tectonics theory. Also based on the seismic activity, taking into account the geological conditions, the article “Mongolian earthquake block” is drawn to explain the conditions and activities of the earthquake in the northern part of North China, and the seismic activity in Mongolia is analyzed Characteristics and earthquake tendency of the earthquakes in China.Second, the boundaries of the Mongolian earthquakes block the rigid lithosphere composed of the crust and the upper mantle, ruptured due to internal forces and formed a number of blocks, some also proposed the earth’s rotation movement and the gravitational and thermal effects The reason, the rock was destroyed, the formation of many broken blocks.