ES1
____ is any kind of shaking of the ground measurable by seismic instruments.
Earthquake
The change in shape of a solid under stress is called
Strain
If you step on a empty soft drink can when its standing up right this is an example of what?
Compression
The amount of strain that a material can endure without breaking.
Ductility.
When playing tug or war you exert a _____ stress on the rope.
Tension
The center of Earths Activity
Focus
The fastest body waves are called ______
P Waves
The spot on earths surface directly above the focus
Epicenter
If a faults motion is parallel to its dip then it is called ____
dip-slip fault
Strengths of earthquakes are reported using ______
Richter Scale
The most important stress in producing earthquake is ____ stress
Shear
A rocks ______ or stretchiness most significantly influences earthquakes.
Elasticity
Usually appear in ocean basins and are connected with mid-ocean ridges.
Transform boundaries
Hard easily fractured materials are ____
Brittle
When the block above the fault surface dropped in relation to the block under the fault then a ____ occurs.
Normal fault
When sections of rocks on opposite sides of the crack move relative to each other.
A fault
The scale given in units of _______ indicates the energy released by the earth movement.
Magnitude
The measure of how much damage actually results from the earthquake.
Intensity
An upward force on a less dense object in a denser material.
Buoyant force
Zones of collision or subduction.
Convergent boundaries
If the only motion along the fault is horizontal then it is a __________
Strike Slip Fault
Divergent boundaries
______ is the second type of wave to arrive at a seismic station.
S waves
Geologists define the direction of a fault by its _____
Strike
If the upper block rose in relation to the lower block, then the fault is a ______
Reverse fault