THE Earth may be under bombardment from ultradense nuggets of dark matter. But the mountain of evidence from seismic monitoring stations that could shed light on this intriguing idea is being routinely thrown away.
Seismic activity, the signals from low-frequency sound waves travelling through the Earth’s crust, is routinely monitored by a global network of around 5000 government-sponsored sites. Researchers at these monitoring stations are only interested in signals that emanate from a fixed point, such as an earthquake or an illegal underground nuclear test. Geological surveys regularly publish so-called “clean” catalogues of seismic activity that appears to originate from…
