How did geologists determine that the west coast of california has a higher earthquake risk than other areas of the united states
a. by measuring the number of aftershocks
b. by looking at data from previous earthquakes
c. by measuring the height of tsunami waves
d. by analyzing the amount of liquefaction

The way geologist determine that the west coast of California has a higher earthquake risk than other areas is :  b. By looking at data from previous earthquakes
The more suitable word is 'comparing;. All of the options can be used as a factor to determine the severity of an earthquake, but in the end, to calculate the risk ratio, you should compare it with other earthquake

hope this helps

I’m good with pshycology