大震系的层次、频度及时间分布特征

THE LEVEL AND FREQUENCY-TIME DISTRIBUTION CHARACTERISTICS OF LARGE SEISMIC SYSTEMS

摘要:

根据地震构造类型、规模及大地震的强度和累积地震矩,将12个大震系划分为4个层次。在一个大震系中,累计的地震数为7-10次,最大地震的地震矩约为总地震矩的0.5左右。用分数维的概念对大震系中大震的频度和能量特征作了初步分析。对大震系内的地震的时间分布,可以用随机统计的方法给出其统计的规律。多数大震系的地震累计数N可近似地用时间t的指数函数表示:N=Ae^Bt

Abstract:

Based on the types of seismic structures,scale,large earthquake magnitude and cumulative seismie moment,12 large seismic systems can be divided into 4 levels.The cumulative earthquake number in a large seismic system is 7 to 10,seismic moment of maximum earthquake about accounts for 50 percent of total seismic moment.The frequency and energy characteristics have been explained by use of the concepts of fractional dimension.
The time distribution of large seismic systems has not only stoc-hastic statistic regular patterns but also certains physical laws.Large earthquakes in intraplate are of cluster character.The cumulative number N for most of large seismic systems can be a exponent func-tion of time t:
N=Ae^Bt.