There are some loose correlations in 2009, and then it goes completely bust in 2008. I have the second 188 day cycle date in 2008 as 8/12/2008. Here is the historical activity on USGS, nothing for the entire month of August:
Magnitude 4.0 SAN FRANCISCO BAY AREA, CALIFORNIA September 06, 2008
Magnitude 5.5 GREATER LOS ANGELES AREA, CALIFORNIA July 29, 2008
Magnitude 6.8 EASTERN HONSHU, JAPAN July 23, 2008
Keep in mind that this could be a relatively new phenomenon as what some think is the cause would elude to (an incoming heavy mass object).
Again, the next few days should offer more evidence.
February 27, 2010 - 1.5 Million Displaced After Chile Quake
September 4, 2010 - New Zealand earthquake: state of emergency declared
March 11, 2011 - Japan Pushes to Rescue Survivors as Quake Toll Rises
September 15, 2011 - Planet convulses in spasm of major earthquakes in 14 hour period
You're right. I went back a few more intervals and it plays out.
I assume Nibiru was too far away back then to have an effect... :)