Surely you are either woefully uniformed or you made your comment in jest.

I cite the following as unrefutable evidence of the 188-day major/great earthquake interval:

Off the coast of Chile
Feb. 27, 2010 mag 8.8 (a GREAT Quake)

[link to en.wikipedia.org]

188 days later

Christchurch (Canterbury), New Zealand
Sept. 4, 2010 mag 7.1 (a MAJOR Quake)

[link to en.wikipedia.org]

188 days later

Tohoku, Japan
March 11, 2011 mag 9.0 (a GREAT Quake and Tsunami)

[link to en.wikipedia.org]

188 days after the Japan quake

Northern Sumatra
Sept. 5, 2011 mag 6.6 (a STRONG Quake)

[link to earthquake.usgs.gov]

188 days after the Japan quake

Tonga
Sept. 5, 2011 mag 6.3 (a STRONG quake)

[link to earthquake.usgs.gov]

198 days after the Japan quake

near Fiji
Sept. 15, 2011 mag 7.3 (a MAJOR Quake)

[link to www.iris.edu]