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