The director of the Southern California Earthquake Center, Thomas Jordan, made an announcement recently that would have sent a chill down the spine of every Californian: that the San Andreas fault appears to be in a critical state and as such, could generate a large earthquake imminently. Of course, the reiteration of the seismic hazard [...]

Gravity Waves Rippling Toward Space Simulated

Like waves that ripple across a pond’s surface from a tossed pebble, gravity waves ripple toward space from disturbances in the Earth’s lower atmosphere. Gravity waves are created when air masses are moved up or down, by disturbances such as a thunderstorm, or when wind is forced up and over a mountain range. But in [...]