earthquakes plastic deformation, stress and elastic rebound.notebook May 29, 2014 http://earthquake.usgs.gov/earthquakes/map/ Picture of the day! Apr 3012:49 PM Death assemblage! Death assemblage! when several animals all die at the same instant because of a catastrophic event such as an earthquake, underwatermudslide, or volcanic eruption Apr 301:20 PM Monday we talked about energy: Energy being stored and energy doing work. We learned that energy will not diminish (or get less), rather it may change form or get transferred from one object to another. Yesterday we learned about friction and the Earth's crust. We learned that energy in the form of heat from the core and mantle of the Earth (which was created when our solar system was born) causes convection currents in the mantle. This energy is transferred to the crust. This brittle, cold crust cracks and rubs, storing energy which can be released all at once or a little at a time. The release of this potential energy causes EARTHQUAKES! How much energy is stored is directly related to how much energy is available to be released~! Apr 301:20 PM Apr 3012:57 PM 1 earthquakes plastic deformation, stress and elastic rebound.notebook Since mantle convection is always happening, it would make sense to think that energy is being stored in the Earth all the time, all day long, all year long. That's a LOT of energy! Apr 301:05 PM May 29, 2014 So why don't we have earthquakes all the time? Apr 301:07 PM Goals: we do! Apr 301:07 PM 1. To determine where most earthquakes in the world are occurring and why they occur there. 2. Determine the differences between faults and plate boundaries 3. To create working definitions for 34 new earthquake terms Apr 301:14 PM 2 earthquakes plastic deformation, stress and elastic rebound.notebook FRICTION! Friction usually does 2 things: it can store energy and it can create heat. Apr 301:24 PM May 29, 2014 But we don't usually call it friction in geology, we call it stress! Apr 301:27 PM Stress causes the Earth (and other things) to deform...or change their shape, volume, or shape and volume. This process is called PLASTIC DEFORMATION Apr 301:31 PM Apr 301:38 PM 3 earthquakes plastic deformation, stress and elastic rebound.notebook May 29, 2014 Oops! Not that kind of plastic deformation.... THIS KIND! Apr 301:39 PM Apr 301:40 PM Apr 301:40 PM Apr 301:40 PM 4 earthquakes plastic deformation, stress and elastic rebound.notebook Let's grab some silly putty and do some PLASTIC DEFORMATION ourselves! Apr 301:41 PM May 29, 2014 Plastic deformation in geology is how a rock will change shape due to stress acting on it. When the stress is released, sometimes the rocks snap back to their ORIGINAL SHAPE! When this happens, it is called... Apr 301:44 PM ELASTIC REBOUND Apr 301:46 PM Apr 301:46 PM 5 earthquakes plastic deformation, stress and elastic rebound.notebook May 29, 2014 Hopefully you noticed that the rocks returned to their original shape, BUT they did NOT return to their original location, they have moved to a new place, how far they move depends on how much stress the rocks were holding Apr 301:47 PM Apr 301:47 PM 6
© Copyright 2026 Paperzz