evidence about past earthquakes from faults by: thomas solowynsky, tom mulally, victoria flis, omar...
Post on 01-Apr-2015
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Evidence about Past Earthquakes From Faults
By: Thomas Solowynsky, Tom Mulally, Victoria Flis, Omar Oregel
Faults There are many faults that tell us
different effects and are caused by earthquakes.
Faults form because of extension or compression.
In Moab, faults are not active right now.
We will explain about earthquakes and what is different between small faults and huge faults.
Extension makes normal faults
Stretching of the ground is called Extension
Extension causes normal faults to form
Identify Faults
Some layers and faults are exposed so clearly like show different kind of stones and slips. Its can tell us if its compression or extension. Or some layers and faults are in a mess and many slips. Sometime its hard to identify the stone because it was mixed up and deformation.
Earthquake Earthquakes tend to start from the
movement in aethenosphere and it will hit to lithosphere.
In the western of U.S., earthquakes can go up to magnitude 6.0 or 7.0.
Small Faults Small faults were caused by either
many small or one medium earthquakes.
In Moab and Arches National Park, small faults tend to clearly show slips and layers.
It is easy to identify kind of rocks and match the layers.
Examples of small faults
Small Faults
Slip on small faults
Slip on faults
Slip on faults
Huge Faults Earthquakes cause the rocks to
move by slip on the fault. Near the fault, the rock gets broken
into lots of pieces from power of earthquakes.
Lots of power = lots of broken rocks There is a lot of grinding close to
faults.
Huge Faults
Fault
Very Broken Rocks! Not Very Broken Rocks
Slip
More About Huge Faults Water goes through faults easily
because of cracks and broken rocks. When old age rocks are together
with younger age rocks, we must have a big fault.
Over time rain falls onto the mountain and the mountain is made more smooth shaped. This is erosion.
Huge Fault Features
Different color
Different color
Fault
FaultYoungestRocks
YoungRocks
OldestRocks
Conclusions
Evidence in the field tells us that old faults once produced earthquakes Small earthquakes
Simple cracks with small amount of slip
Large earthquakes Lots of broken rocks Large faults are easy places for water to
flow
Thanks for Thanks for watching our watching our
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