苏联科学家曾对1904—1977年地震释放总能量与强地震发生次数进行过对比。他们发现地震在太阳活动11年周期高峰时活动频繁,当三年之后太阳活动低潮时,它又一次活跃起来。因此,他们认为地震的活动与太阳活动周期有关。他们还认为,强地震发生的时间,通常 Soviet scientists have compared the total energy released during the 1904-1977 earthquake with the number of strong earthquakes. They found that earthquakes were active at the peak of the 11-year cycle of solar activity and became active again when solar activity was low after three years. Therefore, they think the earthquake activity is related to the solar cycle. They also believe that the time of the strong earthquake, usually