Geoscientists say that the DEMETER satellite saw a clear increase in ultralow frequency radio waves for a period of one month before the M 7.0 earthquake that struck Haiti in January. “The results … clearly indicate that ULF electromagnetic waves can be very useful in revealing possible precursor seismic phenomena,” they suggested.

Ref: arxiv.org/abs/1012.1533: Enhanced ULF Radiation Observed By DEMETER Two Months Around the Strong 2010 Haiti Earthquake.