Richter scale question
posted by Ali on .
An earthquake registers 6.1 on the richter scale. What is the rating on an earthquake twice as powerful?
I know: M=I/Io
Then what do you do?

http://www.matter.org.uk/schools/content/seismology/richterscale.html
Is the epicenter in the desert? In the mountains? In a city? Is it a strikeslip, normal, or thrust type of earthquake?
http://earthquake.usgs.gov/learn/glossary/?term=strikeslip
Lots of different factors. 
I was not given any information regarding these factors, I wrote out the question I was given

Be sure you read (and reread and reread, if necessary) the first paragraph in that first link I gave you above.
Read carefully and apply... 
I'm sorry, I'm still confused.
Is it something like log(2) 6.1?? 
Add log 2 to 6.1

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.9 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.)