Earthquakes are impossible to predict, but a team from Japan located a tremor deep inside Earth and are saying the shake is related to a storm. The ocean floor between Greenland and Iceland was hit especially hard, causing the tremor. The waves scientists detected were S waves (there are two types of waves when discussing earthquakes: P-waves and S-waves) and S waves are much more faint. Hopefully this discovery makes tracking what occurs inside Earth simpler.

Source: http://phys.org/news/2016-08-japan-scientists-rare-deep-earth-tremor.html

Image Source: By Tomas Castelazo (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons