Chapter 7 science Flashcards
what causes EQ’s?
earthquakes are a consequence of moving plates
earthquake
vibration from the sudden release of energy from an area along a fault
fault
fracture in the crust along which there has been movement. two blocks of rock move past each other
normal fault
divergent plate
reverse fault
convergent plate
strike -slip fault
transformate plate
what causes the sudden release of energy
plate movement, blocks are locked, elastic energy over comes friction,
seismic waves
vibration of EQ’s
two types of seismic waves
body waves, surface ways
body waves
goes through the earth
body waves types
P waves, s waves
p-waves (primary)
first waves, compression, high velocity
s-waves (secondary)
sher, slower, only travels through solids
surface waves
most distructive; on the surface
two types of surface waves
love, rayleigh
love waves
move side to side
rayleigh waves
forward rolling motion
measuring seismic waves
waves recieved by a seismograph and the waves are recorded on a seismograph
How are earthquakes epicenters located?
using differences in arrival times between p and s waves
semisgraphs
locates distances not direction
intersection of earthquakes
epicenter
earthquake strength is measured by
intensity and magnitude
intensity scale is based on
damage
Richter scale
logarithmic based 10 scale
amount of damage caused by an EQ is a function of
duration and magnitude
houses should be.. when in an earthquake area
able to move and to be flexible
Seismic gaps
potential sites for future earthquakes
