Earthquakes

Question 1

Hypocenter (focus)
Epicenter

Answer 1

Hypocenter: location where slippage begins
Epicenter: Point on earth’s surface directly above hypocenter

Question 2

Foreshocks:
Aftershocks:

Answer 2

Foreshock: earthquake of lesser magnitude preceding major earthquake
Aftershock: earthquakes of lesser mag after major earthquake, can occur months or years after major event

Question 3

Cause of earthquake

Answer 3

Frictional tension of plates moving against/away store elastic energy
once frictional resistance is exceeded, slippage along the fault produces an earthquake.
ex. snapping a stick causes it to vibrate back and forth
sudden release of stress built from plate movement

Question 4

convergent boundaries

Answer 4

major event, largest due to immense build of pressure. plates sliding over eachother

Question 5

transform boundaries

Answer 5

produces events along any of its numerous branches. plates sliding past eachother

Question 6

divergent boundaries

Answer 6

produce small earthquakes. plates moving away from eachother

Question 7

primary waves
secondary waves
surface waves

Answer 7

P waves compress and expand material they pass through
S waves cause material to oscillate at right angles to direction of wave motion
Surface waves travel along earths surf similar to rolling waves
Sec. Surface waves oscillate ground side to side.
Waves travel along curved path throughout earth

Question 8

Richter scale

Answer 8

10x larger wave amplitude for each unit