The problem is you are using the richter scale. We haven't used that since the 70's.
We currently use the moment magnitude scale, which is similar to the richter but way more accurate. Since it is a logarithmic increase, each jump in the numeric designation is an exponential increase. So for every numerical increment, multiply the power of the quake by 32. Now this is similar to the richter scale, except for a few tiny details. From what I remember, the actual richter instruments were never able to go past 7.0 without maxing out the graph. Furthermore, the lows on the momentum scale are lower that they are on the richter, whereas the highs are higher because of the way the energy output is calculated.
To put it in better perspective, an 8.9 earthquake is, according to the richter TNT chart, equal to 336 megatons. Whereas an 8.8 earthquake only releases 238 megatons. Tsar Bomba, the largest nuclear weapon constructed was only 50 megatons. Little Boy, the bomb dropped on Hiroshima, was only .02 megatons.
So essentially, all those 5.0 earthquakes that were occurring every 5 to 10 minutes was equal to 470+ metric tons of dynamite exploding each and every time.
The last meteor that hit the planet was ranked at a 12.5/13, which equates to 100 teratons of TNT. And the starquake we witnessed in 2004 would have been ranked as a 32 on the scale, which equates to 1×1021 yottatons. If that star had been within ten light years of us, our planet would have been wiped of life.
You guys are undercutting the shear amount of power that is roiling around below the surface!
Someone throw up the "more you know!" graphic!