IS...

• when stress causes rocks to break, vibrantions are called earthquakes.
• when tension forces pull rocks apart a normal fault occurs.
• the epicenter of an earthquake is the points on the earths surface directly above the focus
• at a severe fault, the rocks above the fault surface are forced up and over the rocks below the fault surface
• the focus of an earthquake is the point on the earth's surface where the earth's plates meet
• secondary waves causes particles in rocks to move up and down, causing them to vibrate
• the measure of the energy released by an earthhquake is the earthquakes magnitude
• discontinunity is where the boundiries are called MOho
• Tsumai can cause a grate devastation
• most destructions are created by surface waves
• seismograph is an instrument used to record seismic waves
• a fault between the two plates that are moving sideways past each other is called a strike-slip
• primary waves causes the rocks to move back and forth
• earthquake generates energy called seismic waves
• seismic waves are the waves that travel through the earth and cant travel thru water which causes it to slow down
• primary waves are the fastest and travel the greatest distance, they are the most destructive and can go thru earth and water faster
• the rocks that moves along the surface are called faults
• the shadow zone is a place where no seismic waves are detected
• seismologists uses the ritcher scale to describe the magnitude of an earthquake
• a reverse fault is often found at a convergent plate boundaries
• fault: convergent, divergent, transform
• convergent type: oceanic-oceanic, continental-continental, oceanic-continental
• intensity is the amount of damage in a specific location, or the amount of energy in a specific location
• stress: Compression, tension, shear
• stress(earth science): compression is when the earth's crust is squeezed together
• stress(earth science): shear is the force that pulls apart rock layers
• stress(earth science): tension is the force that causes the rock to move, it is the result of the rock being under tension