Goup 10 Fault
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Transcript of Goup 10 Fault
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FAULT
Group 10 :Dimas Ahmad Syafi’i
Fani Anisa Ayu DesianaFaruk Afero
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OUTLINE OF PRESENTATION
1. Definition 2. Properties of fault’s motion 3. Classification of fault4. Cause of fault 5. Fault dealing with earthquake
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Fault is a fracture in a rock formation along which there has been movement of the blocks of rock and either side of the plane of fracture. Faults are caused
by plate-tectonic forces.
WHAT IS FAULT ?
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What we need to know dealing with fault?
1. Strike : direction of the line formed by the intersection of a fault, bed, or other planar feature and a horizontal plane.
2. dip : is the angle at which a planar feature is inclined to the horizontal plane; it is measured in a vertical plane perpendicular to the strike of the feature
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3. Net slip : relative displacement of a point on the fault plane coincides initially, due to the fault
4. Rake : the angle formed by the net slip with a strike-slip (horizontal shift in the direction of the moment) on fault plane
What we need to know dealing with fault
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5. Hade : angle between the fault plane to a vertical plane parallel to the direction of fault
6. Hanging Wall: rock body parts relatively over the fault plane
7. Foot Wall: rock body parts relative is under fault plane.
What we need to know dealing with fault
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Picture 1. Parts of Fault
α = dip β = rake of net slipθ = hade = – dipab = net slipac = strike slipcb= ad = dip slipae = vertical slip = throwde = horizontal slip = heave
Foot Wall
Hanging Wall
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Properties of fault’s motion 1. Translation : occurs when there is no
rotation between the parts to one another fault.
2. Rotation : occurs when lines or parallel bedding before the fault become not aligned again after the faulted.
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Classification of fault
1. Geometris classification- Dip-slip- Strike-slip - Diagonal slip
2. Relative motion - Normal fault- Reverse fault- Lateral fault
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Fault Classification Based on Geometries
Dip slip fault is fault movement parallel with slope of fault. Devided by 2 : Normal fault and Reverse fault
Strike slip fault is fault movement parallel with strike direction.
Diagonal slip fault is diagonal fault movement
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Fault Classification Based on Relative Motion
1.Normal Fault2.Reverse/Thrust Fault
3.Strike slip Fault
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Normal Fault
Normal fault is created by tensional stress, the hanging wall and footwall are pulled apart from each other
Hanging wall drops down relative to the footwall
Erode
d
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Listric faults are similar to normal faults but the fault plane curves,
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Reverse Fault
Reverse/thrust fault is created by compressional stress, the hanging wall and footwall are pushed each other,
The hanging wall moves upward along the fault relative to the footwall.
Erode
d
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Strike-slip Fault
Strike-slip fault is created by shearing stress
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HOW DO WE KNOW THE EXISTENCE OF FAULT?
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The Characteristics of the existence of fault
1. Changing of river flow2. Presence of Escarpment
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The Characteristics of the existence of fault3.Exist of Triangular facet
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The Characteristics of the existence of fault4.Morphological change in rock
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The Characteristics of the existence of fault5.The emergence of the lake
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What Causes of Fault and how does it formed?
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Fault dealing with earthquake
Approximately 95% of the world's earthquakes occur at the boundaries between the plates of the earth's crust and in the
area of fault.
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THE ADVANTAGES OF THE EXISTENCES OF FAULT
1. We may know the oil trap2. Knowing migration of oils and gases
3. Knowing endogen Forces
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References:
1. Moehandi, Mustoto.Geologi Dasar. Universitas Indonesia 2. www.minsocam.org/ammin/AM35/AM35_922.pdf - ROCK-
MAGMA AND ROCK-SPECIES S. J. Su.txo, Columbia (Jnioersity,New York, N. Y.
3. web.mit.edu/eaps/senior_thesis/sgelmanTHESIS_FINAL.pdf
4. animalpicturegallery.com5. geology.sdsu.edu6. volcanolive.com7. cw.mit.edu/courses/earth-atmospheric-and-planetary-
sciences/12-479-trace-element-geochemistry-spring-2009/seminars-discussions/seminar7.pdf - 2010-09-26 - 12.479 Trace-Element Geochemistry
8. http://www.uwsp.edu/geo/faculty/ritter/glossary/l_n/magma_chamber.html
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THANK YOU