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B·古登堡在研究世界地震活动性时，整理了大量仪器记录的地震资料，通过统计地球上各主要地震区6级以上地震数目，他发现在一定的震级区间内其频n与震纽M有如下关系:
B. Gutenberg collected seismic data recorded by a large number of instruments while studying the seismicity of the world. By counting the number of earthquakes above 6 in major earthquakes on the earth, he found that in a certain magnitude interval, M has the following relationship: