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 ...
It's 19% for a magnitude 4 or higher, 2% for a magnitude 5 and above, and less than 1% for a magnitude 6 or 7 earthquake. The Malibu area quake struck around 7:28 a.m. at a depth of nearly six miles.
In the south-central United States, a significant number of recent earthquakes are thought to be caused by humans. The chart below shows the cumulative total number of earthquakes reported in ...