Earthquake Magnitude Scale Magnitude Earthquake Effects Estimated Number Each Year 2.5 or less Usually not felt, but can be recorded by seismograph. Millions 2.5 to 5.4 Often felt, but only causes ...

(Gravity is so weak as to be entirely irrelevant on these scales.) The fact that it is insignificant on larger scales is the paradoxical effect of an odd strong-force quirk. The photon, which ...