Earthquakes Flashcards
When do earthquakes happen
Happens when the crust is solid and only 100 miles off the epicenter
What is the after shock
Tremors that happen after the main earthquake
Give 3 facts about shallow depth earthquakes
Found at all boundaries, Less than 80km deep, Very powerful, Short warning
Give 3 facts about deep earthquakes
Found at subduction, Not as powerful, Longer warning
Where do earthquakes occur
80% Ring of Fire, Mostly convergent margin activity, 15% at mediteranen-Asiatic belt, 5% in the interior of plates
How many earthwquakes are recorded each year
> 150,000
When do earthquakes occur (2)
When the crust is solid and only about 100 miles off the surface
Give 3 facts about primary waves
Fast, Moves through solid rock, pushes and pulls the rock
What are compression waves
Waves that push and pull through rock
Give 2 facts about secondary waves
Slower and move at right angles
What are the 3 movements of surface waves
Love and Rayleigh, Love goes side to side, Rayleigh up and down
What are the 3 P’s
Prediction, Planning and Preventing
Who are people that study earthquakes
Seismologists
What 2 principals are Earthquakes predicted on
Seismic gaps and earthquake zones
Where are seismic gaps located
Fault lines
