【摘要】 对区域小地震发生率和累计次数的变化进行了理论解释,可以得到小地震的发生率和累计次数与区域应变能量积累速度呈正比,并且发生率取不同值及累计次数曲线斜率产生变化时,区域应变能量的积累状态不同。并针对祁连山-六盘山地震带的不同小区域计算了小地震的累计次数及发生率,表明在中强以上地震发生前,区域小地震累计次数曲线斜率及发生率均会发生变化,显示中强以上地震发生前,其区域应力状态会发生改变。更多还原

【Abstract】 The theory explanation has been done on the changes of the occurrence rate and accumulative time of the regional small earthquakes,from which it suggests that the occurrence rate and accumulative time of small earthquakes shows the direct proportion to the accumulative rate of the regional strain energy.When the occurrence rate takes different values and the accumulative time curve slope changes,the accumulative state of the regional strain energy is different.The accumulative time and occurrence rate of small earthquakes in different small regions along the Qilianshan-Liupanshan Earthquake Belt has been calculated.It has been showed that before the occurrence of moderately strong earthquakes both the curve slopes of the accumulative time and the occurrence rate of small earthquakes all change.It shows that before moderately strong earthquakes occur,the regional strain state change.更多还原