What is the value of x when the Richter scale rating is 3.8?

Log x = 3.8

x = 10^3.8

≈6309.57344

An earthquake with a rating of 3.8 can cause destruction in areas of up to 100 kilometers that are populated.

R = log x

R = rating of the earthquake's size on the Richter scale

x = ratio of earthquake intensity to a minimum level of intensity