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23 Cards in this Set

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what does the mercalli scale do?
Rrate EQ according to their intensity (ground motion)the mercalli's 12 steps describe how EQ affect eople,buildings &land surface
What fault in california is and example of a Strike-Slip Fault?
SAN ANDREAS FAULT
what happens when P wave and S wave reach the surrface?
when P & S waves reach the surface some of them are transformed into surface waves.
WHAT FAULT IS MEXICO IS AN EXAMPLE OF NORMAL FAULT?
RIO GRAND RFT VALLEY IN NEW MEXICO
Geologist anticlines and syclines to describe what?
upward and downward folds in rock
What ar the three main types of stress in rock?
1. TENSION
2. SHEARING
3. COMPRESSION
what are primary waves?
P-wave are the 1st to arrive. p-waves are earthquake waves that compress & expand the ground. P-waves cause buildings to contract & expand.
WHAT ARE THE 3 TYPES OF FAULT?
NORMAL FAULT
STRIKE SLIP FAULTS
REVERSE FAULTS
what is syncline?
A fold in a rock that bends downward in the middle to form a bowl.
Whatis an example in Montanna of a Reverse fault?
THE GLACIER NATIONAL PARK IN MONTANNA
what is anticline?
a fold in rock that bends upward into an arch.
WHAT FORMS WHEN NORMAL FAULTS UPLIFT A BLOCK OF ROCK?
FAULT-BLOCK MOUNTIAN FORMS
what is plateau?
Plateau is a large area of flat land elevated high above sea level.
WHAT ARE FOLDS?
FOLDS ARE BENDS IN ROCK THAT FORM WHEN COMPRESSION SHORTEN AND THICKENS PARTS OF THE EARTH CRUST
what does the moment magnitude sacle do?
rate EQ of all sizes, near or far.
what do they rate
Mercalli scale
Richter scale
moment magnitude scale
1. Mercalli rates motion
2. Richter scale rat size
3. Moment magnitude rates the total energy released by an earthquake.
what are three ways geologist measuring earthquakes?
1. Mercalli scale
2. richter scale
3. moment magnitude scale
How is Magnitude described?
magnitude is a measurement of earthquake strngth based on seismic waves and movement along faults
what does the Richter scale do?
provides accurate measurements for small, nearby EQ. but does not work well for large or distant EQ
what are three types of seismic waves?
1. P waves (primary waves)
2. S waves (secondary waves)
3. surface waves
what is deformation?
Any change in the volume or shape of Earth's crust.
what are the 2 waves earthquake send out?
P-waves and S-waves
what are secondary Waves?
after P-waves come then S-waves come. S-waves are earthquake waves that vibrate from side to side,up & down & back & forth.