ten billion butterfly sneezes

1.8 magnitude earthquake rattles D.C. area
I was in my shabby cubicle when it happened; I thought it was a sonic boom. According to the article:
Earthquakes with a magnitude of about 2.0 or less are usually called microearthquakes, and about 1,000 occur around the world each day, says Bruce Presgrave, a geophysicist with the U.S. Geological [...]