Earthquake
what is earthquake
What waves do earthquake make
Locating earthquake
How is an earthquake's energy measured
Tsunamis
How can people prepare
A sudden movement of earth curst
a suddenly slip of crust
earthquake's focus
earthquake's epicenter
in the ground
the point on the ground
happen along the boundaries of earth's tectonic plates
primary wave
secondary wave
surface wave
fastest
slowest
half speed of primary
back and forth
up and down
move in solid and liquid layers
only move in solid layer
travel along earth's surface
cause most damage
seismometer
difference between the arrival of P wave and S wave
need three station to know the exact location
Magnitude
Richter scale(芮氏規模)
the amount of energy released
30 times per level
7.6/ 5.6- 900 times bigger
move 500-1000km per hour
wave isn't very high
mostly happens at 6.5 richter scale
can be predict
can send warning to every people
building stracture
know what to do when earthquake happen
secure objects that might fall
know the safe spot at your home
kitchen counter
a sturdy table