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 ...

Using this scale, a magnitude 5 earthquake would result in ten times the level of ground shaking as a magnitude ... the building (or other structure) design, and the type of surface material (rock or ...

One of the most commonly known earthquake-measuring tools is the Richter Scale, but the system is no longer used today. In fact, the Richter scale was replaced in the 1970s by other magnitude ...

So just how big was last Friday’s earthquake ? Depending on what source you read — and when you read it — the magnitude of ...

A light, 4.8-magnitude earthquake struck in Texas on Friday, according to the United States Geological Survey. The temblor ...