Potsdam, NY, Jan 01, 2014 — If you've heard a loud boom, cracking sound, or bump in the night recently, it may be what's called a cryoseism. Scientists say they occur when water builds up in soil and expands. When the pressure gets too great, the rock and soil collapse, creating the noise. Sometimes it can be startling.
Potsdam geologist Frank Revetta says these so called "frost quakes" are not uncommon, and may be happening more often because of recent precipitation and bitter cold temperatures.