# Shared Flashcard Set

## Details

Module 3
Violent Earth
18
Geology
09/15/2008

Term
 Elastic Rebound
Definition
 The theory applied to most earth quakes in which movement on two sides of a fault leads to bending of the rocks until they slip to release the bending strain during an earthquake.
Term
 Seismic wave P
Definition
 The compressional seismic wave that shakes back and forth along the direction of wave travel.
Term
 Seismic wave S
Definition
 The seismic shear wave that shakes back and forth perpendicular to the direction of wave travel. s waves do not pass though liquids.
Term
 Surface waves
Definition
 the seismic wave that travels along and near Earth's surface. These waves include Rayleigh waves (which move in a vertical, elliptical motion) and Love waves (which move with horizontal perpendicular to the direction of the wave travel).
Term
 Focus
Definition
 The initial rupture point on a fault.
Term
 Epicenter
Definition
 The point on Earth's surface directly above the focus.
Term
 Seismology
Definition
 The study of seismic waves
Term
 Paleoseismology
Definition
 The study of former earthquakes from examination of offset rock layers below the ground surface.
Term
 Magnitude
Definition
 The relative size of an earthquake, recorded as the amplitude of shaking on a seismograph. The range of amplitudes is so large that the number (less than 10)is recorded as a logarithm of the amplitude. Different magnitudes are based on amplitudes of different seismic waves.
Term
 Intensity
Definition
 The severity of an earthquake in terms of the damage that it inflicts on structures and people. It is normally written as a Roman numeral on a scale of I to XII.
Term
 Reverse fault
Definition
 Faults (generally, steeply inclined) that have the upper block of rock moving up compared with the lower block.
Term
 Normal fault
Definition
 A fault (generally, steeply inclined) that has the upper block of rock moving down compared with the lower block.
Term
 Strike-Slip Fault
Definition
 A fault (generally vertical) which has relative lateral movement of the two sides
Term
 Thrust fault
Definition
 Fault (generally, gently inclined) that has the upper block of rock moving up compared with the lower block
Term
 Mercalli Intensity Scale
Definition
 see intensity scale
Term
 Richter vs. Movement Magnitude
Definition
 The scale of earthquake magnitude invented by Charles Richter.
Term
 Stress
Definition
 The forces on a body. These can be compressional, extensional, or shear.
Term
 Strain
Definition
 Change in size or shape of a body in response to an imposed stress.
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