Here I have fit earthquake frequency statistics to seismic regions.
The upper magnitude limits are poorly determined, many faults will have physical limits to the maximum magnitude quakes possible.
Unfortunately there is not enough data to find the roll-off in most cases.
M2.5 : 46.8 s
M3.0 : 2.55 m
M3.5 : 8.34 m
M4.0 : 27.3 m
M4.5 : 1.49 h
M5.0 : 4.86 h
M5.5 : 15.9 h
M6.0 : 2.16 d
M6.5 : 7.08 d
M7.0 : 23.1 d
M7.5 : 75.7 d
M8.0 : 363 d
M8.5 : 4.78 y
M9.0 : 22.9 y
M9.5 : 110 y
M10.0 : 528 y
Based on 3,228,860 events. Largest M9.5
n = Events per year with magnitude >= M
M <= 7.5
log10(n) = 8.40 - 1.029*M
7.5 < M <= 10.0log10(n) = 10.90 - 1.362*M
Selected Major Regions
Alaska-Aleutians Region, USABlanco Transform Region, USA
Cascades Region, USA
Cayman Trench Region
Chile Trench Region
Gulf of California Region, Mexico
Hawaii Region, USA
Kermadec Trench Region
Mendocino Region, USA
Middle America Trench Region
New Madrid Region, USA
Northern California Coast Region, USA
Oklahoma Region, USA
Peru-Chile Trench Region
Puerto Rico Trench Region
Queen Charlotte Region, Canada
Rocky Mountains Region, USA
Sweetwater Valley Tennessee Region, USA
Sierra Nevada Mountains Region, USA
South Sandwich Trench Region, USA
Southern California Region, USA