Earthquake
An earthquake is the sudden movement of the crust along the fault line
• When rocks break or crack, vibrations/waves are produced which travel
through the earths crust. I.e earthquakes are caused by faulting.
• Earthquakes occur when pressure builds up between 2 rocks. When the
rocks break it release the energy. The rock moves into a new position and
then rebounds back again
• Earthquakes occur in the uppermost part of the crust extending to a depth
of 65km
Focus- Where the earthquake occurs in the earths crust
Epicentre- Directly above the focus on the earths surface
Isoseismal lines- Lines joining places of equal shock wave intensity.
• The shock is most intense and the most damage is caused at the epicentre
• Outwards from this point the severity of the earthquake decreases in all
directions.
• When the rock ruptures the release of energy causes seismic waves to be
produced. (just as wind energy causes waves in water to move across a
lake or ocean, seismic waves move through the layers of the earth)
• These seismic waves are what produce the destruction that accompany an
earthquake by heaving, shaking and cracking the ground as they pass
through an area
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An earthquake is the sudden movement of the crust along the fault line
• When rocks break or crack, vibrations/waves are produced which travel
through the earths crust. I.e earthquakes are caused by faulting.
• Earthquakes occur when pressure builds up between 2 rocks. When the
rocks break it release the energy. The rock moves into a new position and
then rebounds back again
• Earthquakes occur in the uppermost part of the crust extending to a depth
of 65km
Focus- Where the earthquake occurs in the earths crust
Epicentre- Directly above the focus on the earths surface
Isoseismal lines- Lines joining places of equal shock wave intensity.
• The shock is most intense and the most damage is caused at the epicentre
• Outwards from this point the severity of the earthquake decreases in all
directions.
• When the rock ruptures the release of energy causes seismic waves to be
produced. (just as wind energy causes waves in water to move across a
lake or ocean, seismic waves move through the layers of the earth)
• These seismic waves are what produce the destruction that accompany an
earthquake by heaving, shaking and cracking the ground as they pass
through an area
.
s
.
.
.
.
.
.
.
