The ionosphere is very sensitive to solar storms. And it turns out it is also sensitive to extreme earthquakes.
According to NASA, the magnitude 7.8 earthquake in Nepal on April 25, 2015 was so powerful that it created waves of energy that penetrated the ionosphere, disturbed the distribution of electrons and made it sing.
The wave patterns, circled, above, are waves of electron density rippling from a point in the ionosphere above the epicenter of the quake. They were measured by a science-quality GPS receiver in Lhasa, Tibet.
The dynamic spectrum, below, shows that the ionosphere was ringing in periods of ~2 and ~8 minutes. These tones have been most probably created by atmospheric pressure waves billowing up from the trembling Earth below.
Read the full Ionosphere Natural Hazards Team‘s article.