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Created by OSCAR team October 2011
ID template 4.7.1 Created by OSCAR team October 2011
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Welcome 1 This is a document to explains the chosen concept to the animator. This will take you through a 5 section process to provide the necessary details to the animator before starting the animation. The legend on the left will indicate the current status of the document. The big Black coloured number will denote the current section, the Grey color would denote the completed sections, and the Turquoise color would denote the remaining sections. The slides having yellow background (like this one) are the 'Instruction slides' 2 3 4 5
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Deformation of the hanging wall above a listric fault
Related LOs: Prior Viewing: Graduation level of fundamental structural geology Future Viewing: Course Name: Level(UG/PG): PG Author(s): Arpita Roy Mentor(s): Prof. Soumyajit Mukherjee Title of the concept *The contents in this file are licensed under Creative Commons Attribution-NonCommercial-ShareAlike 2.5 India license
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Learning objectives 1 After interacting with this Learning Object, the learner will be able to: (a) Describe listric fault (b) Demonstrate the deformation of the hanging wall above a listric fault after applying simple shear in different directions. 2 3 4 5
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1 Master layout or diagram 2 3 4 5
Make a schematic diagram of the concept Explain the animator about the beginning and ending of the process. Draw image big enough for explaining. In the image, identify and label different components of the process/phenomenon. (These are like characters in a film) Illustrate the basic flow of action by using arrows. Use BOLD lines in the diagram (minimum 2pts.) In the slide after that, provide the definitions of ALL the labels used in the diagram You may have multiple master layouts. In this case, number the master layout. (e.g. Master layout 1, 2, 3…) 2 3 4 5
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Master Layout-1 1 L Length of hanging wall Foot wall Curved fault surface L Fig. 1 (a) Distance Length of the hanging wall 2 Displacement (slip) Shear Fig. 2(a) a a Initial position of hanging wall 3 Final position of hanging wall Inclined shear stress 4 Impression of the initial position of the hanging wall Fig. 3 (a) Gap Firstly consider two blocks of fault which become detached after faulting. The fault consists of a curved fault surface-termed listric fault. Next, apply inclined shear and the resultant is shown in Fig. 4 (a). 5 Fig. 4(a)
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Master Layout-2 1 Length of the hanging wall L Hanging wall Curved fault surface 2 Fig. 1(b) D Foot wall Foot wall L Displacement (slip) Initial position of Hanging wall Fig. 2(b) D 3 Initial position of hanging wall Shear Final position of hanging wall Displacement along the curved surface Vertical shear stress 4 Foot wall Fig. 3(b) Impression of the initial position of hanging wall The two blocks were attached previously (Fig. 1). In Fig. 2 the two blocks have been displaced. Then after apply vertical simple shear the result is shown in Fig. 4 (b). D Fig. 4(b) 5 Result of vertical simple shear
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Definitions and Keywords
1 1) Fault: Fault is a structural feature in the Earth surface where one side/ block moves relative to the other side/block 2) Hanging wall and Foot wall: Fault divides the rocks into two parts. The upper part is termed as hanging wall and the lower part is termed as foot wall 3) Listric Fault: Fault associated with curved fault surface 4) Simple shear: “It is type of constant volume plane strain deformation .There is no stretching or shortening of lines or the movement of the particles in the third direction "Fossen 2010 5) Antithetic simple shear: Shear plane dipping against the main fault 6) Inclined shear and vertical shear: Shear acts by making an angle (inclined angle) with respect to the existing surface is termed as Inclined shear and shear acts vertically with respect to the existing surface is called Vertical shear 2 3 4 5
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3 Stepwise description of process 1 2 4 5
The goal of the document is to provide instructions to an animator who is not a expert. You have to describe what steps the animator should take to make your concept come alive as a moving visualization. Use one slide per step. This will ensure clarity of the explanation. Add a image of the step in the box, and the details in the table below the box. You can use any images for reference, but mention about it's copyright status The animator will have to re-draw / re-create the drawings Add more slides as per the requirement of the animation 2 3 4 5
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Step 1(a): For master layout-1, initial position of the two blocks associated with listric fault
Length of the hanging wall 2 Hanging wall of the fault Curved fault surface Foot wall 3 Fig. 1 (a) Listric fault Description of the action Audio narration Text to be displayed 1) Show the two blocks of fault with curved fault surface. L is the length of the hanging wall 2) Time duration will be 0.5 sec. Fault with curved fault surface is called listric fault. 4 5
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Step 2(a): For master layout-1, displacement occur due to faulting
Step 2(a): For master layout-1, displacement occur due to faulting 1 Length of the hanging wall L 2 D Hanging wall Displacement (D) Shear stress direction 3 Fig. 2 (a) Description of the action Audio narration Text to be displayed Apply the shear stress parallel to the blocks. Rigid displacement ’D’ occurs between hanging wall and footwall Time duration will be 1 sec to 1.5 sec. The length L of the hanging wall is kept constant. 4 5
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Step 3(a): For master layout-1, application of inclined shear
These arrows has been formed by joining the intermediate position between initial and final position of the hanging wall. Initial position of hanging wall Final position of hanging wall 2 Shear direction (Inclined) Foot wall 3 The grey colored portion denotes the initial position of the hanging wall. After applying inclined shear, the final position has been shown here by twitter blue colour. Vertical shear direction Fig. 3 (a) Interactivity action Audio narration Text to be displayed 1) In this case apply inclined shear . Hanging wall would be lowered down (as it has shown here) 2) Time duration will be 1 sec. to 1.5 sec. Fig. 1(c) is the mechanism of how the hanging wall is going down. 4 5
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Step 4(a): For master layout-1, Resultant phenomenon of fig
Step 4(a): For master layout-1, Resultant phenomenon of fig. 3(a) after applying the inclined shear stress 1 Initial position of hanging wall Final position of hanging wall Final position of hanging wall Foot wall Gap 2 Fig. 3 (a) Foot wall Resultant of Fig. 3 (a) 3 Green arrows is showing the resultant phenomenon Gap develops back side Fig. 4 (a) Description of the action Audio narration Text to be displayed 1) After applying inclined shear the resultant Fig. is Fig. 4(a) 2) Time duration will be 1 sec- 1.5 sec. The frontal gap would be diminished and gap will develop in the back side (as shown in the Fig. 4). 4 5
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Step 1(b): For master layout-2, Initial position, two blocks in listric fault
Length of the hanging wall Curved fault surface 2 Hanging wall Foot wall 3 Fig. 1 (b) Foot wall Interactivity action Audio narration Text to be displayed 1) Show the two blocks associated with listric fault 2) Time duration will be 0 .5 sec. 4 5
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Step 2(b): For master layout-2, Displacement occurs due to faulting
1 Foot wall D Length of the hanging wall 2 Displacement Hanging wall Shear stress 3 Foot wall Fig. 2 (b) Interactivity action Audio narration Text to be displayed Apply the shear stress parallel to the blocks (as it shown here in circle). Rigid displacement ‘D’ occurs between hanging wall and footwall Time duration will be 1 sec-1.5 sec. The length L of the hanging wall is kept constant. 4 5
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Step 3(b): For master layout-2, Application of vertical shear stress
1 Initial position of hanging wall L Length of the hanging wall Curved fault surface Vertical shear 2 Final position of hanging wall Initial position has been marked by grey colour and after applying vertical shear it has been lowered down marking by twitter blue colour. 3 Fig. 3 (b) Interactivity action Audio narration Text to be displayed Apply vertical shear. The hanging wall would go downward as shown in Fig. 3(b) Time duration will be 1 sec-1.5 sec. Fig. 3(c) will show the mechanism how hanging wall move and go down after applying the vertical shear. 4 5
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Step 4(b): For master layout-2, Resultant Fig. of Fig
Step 4(b): For master layout-2, Resultant Fig. of Fig. 3 (b) after applying vertical shear stress 1 Vertical shear Foot wall Displacement along the curved fault surface Final position of Hanging wall 2 Fig. 3 (b) 3 Resultant of Fig. 3 (b)) D Green arrows is showing the resultant phenomenon Fig. 4(b) Interactivity action Audio narration Text to be displayed Show the resultant Figure in Fig. 4 (b). after applying vertical shear. 2) Time duration will be 1 sec- 1.5 sec. 4 5
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1 Animation design Please see the design template provided in the next slide. This is a sample template, and you are free to change as per your design requirements. Try and rename the tabs / buttons / sections / subsections as shown in the template. Use ‘callouts’ as shown above to explain the source of content. Ex: If the call out is placed at the Tab 01, and you want the content to be taken from slide 3 of this presentation, then place this callout on the Tab 01, and write ‘Slide 3’ inside the callout. 2 3 Slide 3 4 5
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Time duration for Fig. 1(a) 0.5 sec. and for Fig. 2(a) 1-1.5 sec
Slide 3 Introduction Tab 02 Tab 03 Tab 04 Tab 05 Tab 06 Tab 07 Deformation of hanging wall in listric fault Interactivity area Two blocks joined with a curved fault line Button 01 Button 02 Fig. 1(a) Button 03 D Two blocks have been separated by rigid displacement-’D’ Fig. 2(a) Time duration for Fig. 1(a) 0.5 sec. and for Fig. 2(a) sec Credits
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Time duration for both cases will be 1sec-1.5 sec
Slide 3 Introduction Tab 02 Tab 03 Tab 04 Tab 05 Tab 06 Tab 07 Deformation of hanging wall in listric fault Interactivity area Application of inclined shear stress Button 01 Button 02 Fig. 3 (a) Button 03 Resultant figure after applying inclined shear Fig. 4 (a) Time duration for both cases will be 1sec-1.5 sec Credits
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Time duration for both cases will be 1 sec-1.5 sec.
Slide 3 Introduction Tab 02 Tab 03 Tab 04 Tab 05 Tab 06 Tab 07 Deformation of hanging wall in listric fault Interactivity area Application of vertical shear stress Button 01 Button 02 Fig. 3(b) Button 03 Resultant figure after application of vertical shear stress Fig. 4(b) Time duration for both cases will be 1 sec-1.5 sec. Credits
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Self- Assessment Questionnaire for Learners
APPENDIX 1 Self- Assessment Questionnaire for Learners Please provide a set of questions that a user can answer based on the LO. They can be of the following types: These questions should be 5 in number and can be of objective type (like MCQ, Match the columns, Yes or No, Sequencing, Odd One Out). The questions can also be open-ended. The user would be asked to think about the question. The author is requested to provide hints if possible, but a full answer is not necessary. One can include questions, for which the user will need to interact with the LO (with certain parameters) in order to answer it. It is better to avoid questions based purely on recall.
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Questionnaire APPENDIX 1
1) What will be intermediate stage between the initial position and final position of the hanging wall due to applying inclined shear force over it? Fig. 1 Fig. 2 Movement of the hanging wall due to shear stress Fig. 3
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Questionnaire APPENDIX 1 Options are: a) Answer will be Fig. 1
b) Answer will be Fig. 2 c) Answer will be Fig. 3 2) Why the inclined shear has been named as ‘antithetic’ shear? a) Shear plane dipping against the main fault (here listric fault only) b) Shear plane dipping in the same direction adjacent to the main fault c) Shear direction would be synonymous to anticlockwise direction d) None of these. 3) In the case of deformation of hanging wall, the length of the foot wall a) Shortens b) Extends c) remains fixed, has no change d) goes slightly upward
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Questionnaire 4) Vertical shear involves a) Shortening b) Extension
c) None of these d) Neither extension nor shortening, but individual layers will be extended
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Links for further reading
APPENDIX 2 Links for further reading In the next slide, provide some reference reading material for the users. It could be books, reference publications, or website URLs.
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Links for further reading
APPENDIX 2 Links for further reading 1) Fossen H., Structural Geology. Cambridge University Press, Cambridge. pp 2) Twiss R.J., Moores M.E., Structural geology. W.H. Freeman and Company, New York. pp
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APPENDIX 3 Summary Please provide points to remember to understand the concept/ key terms of the animation, in the next slide. The summary will help the user in the quick review of the concept.
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APPENDIX 3 Summary Listric normal fault (with curved fault surface) has been considered in our discussion. In this case due to shear stress, a gap‘d’ generates in between hanging wall and foot wall. In this stage if we apply inclined shear stress and vertical shear stress the changes would occur for individual stage. In both cases (inclined shear stress and vertical shear stress) the hanging wall block conforms the shape of the listric fault keeping constant the length (L) of the surface layer and total layer of the block.
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