1900至今 每年地震平均次數DescriptorMagnitudeAverage Annually Great 8 and higher 1 ¹ Major 7 - 7.9 17 ² Strong 6 - 6.9 134 ² Moderate 5 - 5.9 1319 ² Light 4 - 4.9 13,000(estimated) Minor 3 - 3.9 130,000(estimated) Very Minor 2 - 2.9 1,300,000(estimated) ¹ Based on ...