The Earthquake Cycle

Question 1

Divergent plate motion creates _____ stress

Answer 1

Extensional

Question 2

Convergent motion creates ______ stress

Answer 2

Compressive

Question 3

Transform motion creates ____ stress

Answer 3

Shear

Question 4

Temporary flexing stores up energy

Answer 4

Elastic Strain (Like a rubber band)

Question 5

Permanent bending slow and gradual

Answer 5

Ductile Strain (Like a paperclip)

Question 6

Permanent break, fast and violent

Answer 6

Brittle Strain (Think of a tooth pick, or an earth quake)

Question 7

Elastic strain and temporary flexing both…..

Answer 7

Store energy

Question 8

How or weak rocks release energy slowly by…

Answer 8

Bending

Question 9

When cold or strong rocks break……

Answer 9

They release all their energy at once (Earth quake)

Question 10

What causes a quake?

Answer 10

Rocks store energy up to their limit, then they break

Question 11

Real rocks are ____ and real faults are ___

Answer 11

Messy, Uneven

Question 12

Why can we never predict the elastic limit?

Answer 12

Because friction changes each time the fault locks up

Question 13

What is the Earthquake Cycle?

Answer 13

Fault is locked by friction
Plate Tectonic stress builds, STORING ENERGY in rocks as they flex (elastic strain)
Rocks hit elastic limit and break (brittle strain) RELEASING ENERGY as a quake

Question 14

What do false earthquake alarms cause?

Answer 14

Panic and distrust

Question 15

We can measure elastic strain in rocks and find ________ where faults are locked up

Answer 15

Seismic gaps

Question 16

We do not know exactly ______ strain each fault can take

Answer 16

How much