A PASEIS seismometer sits on a concrete slab belowground

A PASEIS seismometer sits on a concrete slab belowground

A PASEIS seismometer sits on a concrete slab belowground.

A seismometer sits on a concrete slab belowground. The network of seismometers used by PASEIS can detect and locate all magnitude 2 and stronger seismic events as well as many smaller events. 

IMAGE: Kyle Homman