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M6.0-6.9 EQs may be under-reported till 1949 in USGS Earthquake Catalog, which most of pages listed in front page use.
The search results of M6 class EQs were 1900-1949=1094, and 1950-1959=1327. Numbers of M6 class EQs are far less in 1st half of 20th century. The average number of M6 class EQs after 1950 is 139/year. Therefore, 1900-1949=1094 count may be under by several thousands.
Good news is: Numbers of M7+ EQs seems consistent since 1900.
