The recent nuclear test in North Korea presents a quandary for seismologists. The political posturing and global tension these events create is significant. And yet scientifically, they are fascinating.
As we head into winter, seismic events generated by glaciers—so-called icequakes—have quieted down for the season. Each year, hundreds of these icequakes are large enough to be caught by our standard earthquake detection routines.
People are often surprised at how sensitive our instruments are to earthquakes. This animation shows seismometers across Alaska as they respond to shaking from the magnitude 6.3 Skwentna earthquake on September 25.