EARTH SCIENCE EARTHQUAKES/VOLCANOES VOCABULARY Earthquake Fault Normal fault Reverse fault Strike-slip fault Thrust fault Hanging wall Footwall Seismogram Elastic rebound theory s-waves p-waves surface waves epicenter focus intensity magnitude Richter Scale Mercalli Scale Shadow zone Tsunami Volcano Fissure Caldera Magma Hot spot Cinder cone Shield volcano Composite volcano (stratovolcano) Pyroclastic flow