论文部分内容阅读
根据历史资料,地震在时间和空间分布上具有一定的规律。地震在空间上呈带状分布,称为地震带。世界上主要有两大地震带,即环太平洋地震带和地中海—喜马拉雅地震带,我国处在这两大地震带之间,是一个多地震的国家。我国的地震主要集中在下列地带:①台湾和福建沿海;②太行山沿线和京津唐地区;③西南青藏川滇地区;④西北的新、甘、宁地区等。地震在时间上具有周期性、重复性和迁移性的规律。地震在全世界、一个地区或一个地震带,有活跃期和平静期交替出现的现象,称为地震周期性(或间歇性)。地震周期性大致可分为4个阶段:平静期阶段,是应变能量积累,时间较长;前兆活动阶段,有些中强地震发生;能量大释放阶段,出现最强的地震;剩余能
According to the historical data, the earthquake has certain rules in time and space distribution. Earthquakes spatially distributed, called the seismic zone. There are two main earthquakes in the world, that is, the Pacific Rim and the Mediterranean-Himalayan seismic zone. China is located between these two major seismic zones and is a multi-earthquake country. The earthquakes in our country are mainly concentrated in the following zones: ① Taiwan and coasts of Fujian Province; ② along the Taihang Mountains and the Beijing-Tianjin-Tangshan region; ③ southwest Qingzangchuan-Yunnan region; ④ northwest of the new, Gan, Ning area. Earthquakes have periodic, repetitive and migratory laws in time. Earthquakes occur throughout the world, in a region or in a seismic zone, with alternating periods of active and quiet periods called cyclical (or intermittent) earthquakes. The periodicity of earthquakes can be roughly divided into four stages: the period of calm period, which is the accumulation of strain energy for a long time; some moderately strong earthquakes occur during the period of precursor activity; the most powerful earthquake occurs during the period of large release of energy; the residual energy