This question has several parts that must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. The largest recorded earthquake centered in idaho measured 7. 2 on the richter scale. Exercise (a) the largest recorded earthquake centered in montana was 3. 16 times as powerful as the idaho earthquake. What was the richter scale reading for the montana earthquake? exercise (b) the largest recorded earthquake centered in arizona measured 5. 6 on the richter scale. How did the power of the idaho quake compare with that of the arizona quake?.