Data

Copy and paste the text below. It is read-only. Select All

aftershock A weaker earthquake that occurs after a larger earthquake asthenosphere -The lower layer of the crust -weak sphere(soft) -small amount of melting body wave seismic waves that travel through Earth's interior (p waves and s waves) core the central part of the Earth - composed of iron/nickel alloy -extreme pressure crust the outer layer of the Earth (thin/ rocky) skin of earth divided into oceanic and Continental crust earthquake the vibration of earth produced by the rapid release of energy -most often earthquakes are caused by slippage in the fault elastic rebound -the springing back of rock - rock behaves elastically epicenter the location on the Earth's surface directly above the focus(center of earthquake under the surface) of an earthquake fault large fractures in earth's crust fault creep occurs smoothly, with little seismic activity - slow, gradual displacement focus -center of earthquake waves -under the surface foreshock a small earthquake before a major earthquake ex: days before or years before inner core a dense sphere of solid iron and nickel at the center of Earth -material in the inner core is stronger(solid) intensity degree of shaking(earthquake) liquefaction occurs when an earthquake's violent shaking turns loose, soft soil into liquid mud -unconsolidated materials that are saturated with water lithosphere the solid part of the earth consisting of the crust and outer mantle - sphere of rock magnitude - quantitive measurement of an earthquake based on seismic records mantle the layer of the earth between the crust and the core -solid rocky shell modified mercalli intensity scale measures damage (moho) boundary that separates the crust from the mantle movement magnitude amount of displacement along the fault zone, rather than measuring ground motion outer core liquid layer primary (p) waves one type of waves that travel through earth's interior Richter scale - based on amplitude of largest seismic wave -Richter magnitude less than 2.0 can't be felt by humans - Richter magnitude used for local earthquakes secondary (s) waves the other type of wave that can travel into earth's interior but not completely ( half way) tsunami seismic sea wave - occurs when oceanic crust is displaced - water can build up (height) seismogram records of earthquakes (written down) seismograph modern instruments that record earthquake waves seismology the study of earthquake waves shadow zone s waves can not travel through this zone (middle of earth) surface waves waves that along earth's outer layer (surface)