摘要
统计了 1 90 0～ 1 999年全球大地震 (M≥ 7.0 )的纬向分布 ,进一步证实了全球大地震的分布的确存在不对称问题 ,北、南半球大地震发生的次数不对称 ,北半球多 ,南半球少 ;二个半球大地震集中分布的区域不对称 ,北半球大地震集中分布的区域为 1 5°～ 55°,南半球集中分布的区域为 0°～ 35°;北半球有 3个明显的大地震分布区间 ,即 1 5°～ 2 0°,35°～ 45°,50°～ 55°;两极地区无大地震。并且导出了计算日、月对地壳纬向水平引潮力达到极值的计算公式 ,根据日、月水平引潮力达到极值时的纬度分布的规律 。
The problem of latitudinal distribution asymmetry for global great earthquakes (M≥7.0) has been discovered earlier by the international geoscientific circle, but it is very difficult to explain. Statistics have been made in the paper for the latitudinal distribution of great earthquakes (M≥7.0) occurred in the world in the last 100 years from 1900 to 1999. And it has been further proved that the problem of asymmetry in the distribution of great earthquakes in the world does exist. The great earthquakes occurred in the northern and southern hemispheres are asymmetric, there are more earthquakes in the northern hemisphere and less in the southern hemisphere. The regions with concentrated earthquakes are asymmetric in both hemispheres, it is 15°～55° in the northern hemisphere and 0°～35° in the southern hemisphere. There are three obvious regions with great earthquakes, they are 15°～20°, 35°～45° and 50°～55° in the northern hemisphere. There is not any great earthquake in the polar area. The authors have derived the formulas to calculate the extreme values of solar and lunar latitudinal horizontal tide generating forces to the crust. And the asymmetric problem of global great earthquake distribution has been better explained based on the latitudinal distribution law when the solar and lunar tide generating forces reach the extreme values.
出处
《地震》
CSCD
北大核心
2001年第2期1-6,共6页
Earthquake
基金
国家重点基础研究发展规划项目!( G1 9980 4 0 70 3)
关键词
地震分布
动力学解释
纬向分布
水平引潮力
Distribution of global great earthquakes
Asymmetry
Dynamic explanation
