Go to earthquake.usgs.gov
Click the settings icon, which looks like a bike sprocket in the upper right corner of the page.
On the new partial page that appears click the button to Search Earthquake Archives 
Enter 2008-06-08 as the start date
Enter 2008-12-31 as the end date
Change minimum magnitude to 0.
We will use the circle/donut search feature to look for aftershocks.
Type the earthquake’s latitude and longitude into the boxes designated Center Latitude and Center Longitude.
Make the Inner Radius 0 and the Outer Radius 100
Order By Time - Oldest First
Click Search.
There’s your map and list of earthquakes.
Answer these questions:
4. How many earthquakes did this search find?
5. What was the biggest event (not including the mag 6.4 main shock), and how many are there of this size? Does this observation support Båth's Law?
6. Make a plot that compares the aftershock data you found for this earthquake to Omori's law. Note: I think the easiest way to do this will be to count the number of aftershocks each day and plot them. Then put another line on your plot that shows the ideal Omori relationship. That way you can compare the two. (If you have trouble getting started with this, post to the "Questions" discussion board.)  
7. Does the number of earthquakes in this region decay with time as Omori's Law predicts? Discuss the observations suggested by your plot. If you did not find an Omori-type relationship, what are some possible reasons?
8. What assumptions did we make that may or may not have been valid when we looked for aftershocks using this search feature? 
9. Make an educated guess about the background rate of seismicity in this area. How did you decide?