[math-fun] big meteor blasts no longer escape notice

http://ntrs.nasa.gov/search.jsp?R=20110016611 is about the previous largest blast before Chelyabinsk, about 70 kilotons worth of bang near Sulawesi Indonesia. Nobody appears to have directly noticed it, but a worldwide network of "infrasound" detectors did, and apparently every blast of this nature will be detected by same from here on out.