Rocks in the crust can bend, stretch, and compress a little.

Faults occur only on land.

Any shaking of the ground measurable by seismic instruments is called an _______

Tectonic plate boundaries that move apart, or spread away from each other are called ______

Tectonic plates that move towards each other (or moving together) at boundaries are called _______

The amount of strain that a rock can handle without breaking is related to its property of _______

When a material stretches past is elastic limit, it ______ suddenly, releasing energy

The upward force that a fluid exerts on an object in the fluid

A contact force that acts to squeeze or crush an object of substance

The margin between two tectonic plates that are moving toward each other

The margin between two tectonic plates that are moving away from each other

A measurable movement of earth crust

An instrument that detects the movement of the earth due to seismic waves

Any force exerted on an object

Forces acting in opposite directions on different parts of the same object or substance

Forces that act to pull an object apart

The margin between two tectonic plates that are sliding in opposite directions parallel to the margin (plates sliding past each other) is called _____

The angle of slope of a fault face or stratum, measured from the horizontal plate

A fault whose main motion is parallel to its dip direction

The location on the earths surface directly above an earthquake’s focus

A joint or crack in rock where the rock on both sides of the crack has moved relative to each other.

The point of an earthquake’s origin deep within the earth

A measure of the concentration of energy or the effects of the energy released.

A crack in a rock that shows no indication of motion on either side of the crack

A dip-slip fault in which the upper body of rock drops relative to the lower body of rock

A dip-slip fault in which the upper body of rock slides upward relative to the lower body of rock

Any change in the shape of a solid due to stresses exerted on the material

The compass direction of the horizontal plane of the surface of a fault face or rock stratum.

A fault along which the main movement is horizontal or parallel to the fault’s strike

What does USGS stand for?

The Quake Cather Network discountinued in _____

The Quake Catcher Network was replaced by ________

Earthquakes make the _____ shake as _____ pass through the earth’s cruse

Some ________ causes of earthquakes are faults slipping, volcanoes, landslides, etc

Some ___causes for earthquakes are explosions, mine cave-ins, aircraft crashes, etc

_____ are produced during an earthquake

_____ forces cause stress in the earth’s crust. These build up over time as the Earth’s tectonic plates slowly move.

Hotter, less dense rock rises due to _____ force

Cooler, denser rock sinks due to what force?

These 3 types of plate boundaries are locations of the greatest stresses in the crust

T or F: rocks can flex or fail under stress

When rocks ___, they bend without breaking

When failure occurs in rocks, they ____ to form joints and faults.

The distortion, bending, stretching, or compression of a material under stress is called _____

Faults form when rocks on ____ sides of a crack move _______to each other

A crack formed under stress is called a _____

T or F: joints can vary in size and appearance

T or F: joints can result from many geologic processes

When rocks break as they form joints, only very ____ seismic waves are produces.

Geologists describe faults by 2 main characteristic: pick them

The direction of the fault line is called the ___

The angle of a fault plane

T or F: a fault is classified by how the blocks of rock on opposite sides of the fault plane move relative to each other

The 2 MAIN types of fault classification is dip and strike. They can be broken down further, but these are the 2 main types

Fault motion is parallel to its dip

Hanging wall moves down relative to footwall (caused by tension) is what type of fault?

Hanging wall moves up relative to footwall ( caused by compression) is called ______ fault

_____ fault with a dip less than 45*

T or F: A THRUST FAULT has a dip more than 45*

Blocks that move horizontally past each other ( caused by shearing) are called _____ faults

Another name for strike-slip faults is ______

Earthquakes happen due to the shaking, jerking motion of faults or tectonic plates existing or newly formed faults.

T or F: real faults may move in a direction that is combination of both strike-and dip-slip fault ts. Geologists try to classify a flat my the direction of its GREATEST motion