在本世纪四十年代前后,日本石本、饭田和美国古登堡、里克特分别提出,不同大小地震的频度与震级遵循统计关系:lgN=a-bM。这一统计关系已为愈来愈多的统计资料所证实,成为目前地震学中得到最广泛承认的地震活动性研究的基本统计规律之一。近十几年来,有不少人根据某地区“地震频度的对数与震级呈线性关系”这一统计规 In the 1940s of the present century, Japan Shibben, Iida and the United States Gutenberg, Richter proposed that the magnitude and magnitude of earthquakes of different sizes follow the statistical relationship: lgN = a-bM. This statistical relationship has been confirmed by more and more statistical data and has become one of the basic statistical laws of the most widely accepted seismic activity research in seismology. In the past decade or so, many people based on the statistical rules that “the logarithm of earthquake frequency is linear with magnitude”