中文摘要：

以全球范围内1973-01—01—2012—12—30日里氏7．0以上地震为研究对象，引入有限离散函数微商，并定义了评估地震活跃性的数值R，根据IERS提供的日长数据，从新的角度分析了地球自转速率变化对地震的诱发作用：1）地震发生在dLOD^＋2／dMJD极值点以及零值点的几率远大于随机理论几率，表明日长变化速率变化快以及正负交换时会诱发地震的发生；2）地震活跃性呈现周年、近6500天周期，这与日长大振幅周年、18．6年周期相对应。

英文摘要：

The effects of earth rotation rate change on earthquakes were analized based on the earthquakes that are bigger than Richter scales 7.0 duaring the period of January 1st, 1973 and December 30th, 2012 around the world with LOD data from IERS. At the same time, the definitions of discrete function derivative and R were intro- duced to assess the seismic activity. The results indicate： 1 ） The probability of earthquake occuring at extreme points and zero-value point is much larger than the probability of stochastic theory, which shows that rapid change or the rechange period of negative and positive values of earth rotation rate would induce earthquakes. 2） The seis- micity presents yearly period and nearly 6 500-day period, which corresponds with LOD＇ s annual period and 18.6-year period. These results have significant value in understanding and prediction of earthquakes.