As IS II begin our unit on Plate Tectonics, we start with faulting and earthquakes. Today we calculated magnitude of quakes using a nomogram and began using Virtual Earthquake. As is often the case, the Earth helps me along by providing a real example of what we are studying. The Chilean quake has done just that. We check in on Google Earth and the USGS KML file to see the aftershocks; I share Twitter posts of a seismogram from Liverpool, England and plots of depth of quakes along the Peru-Chile trench that show the angle of subduction.