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Fig. 50. Fault anatomy

Compression is usually responsible for reverse faulting where the hanging wall is moved up relative to the footwall. A reverse fault that dips 30 or less becomes a thrust fault.

Strike-slip faults occur where crustal blocks slide laterally by each other along nearly vertical zones of movement.

Strike-slip faults are referred to in many ways, including wrench, tear, and transcurrent faults. They are identified by the sense of movement of the block on the far side of the fault from the viewer. If the viewer is observing the fault and the block on the far side of the fault has moved to the right, the fault is known as a right-lateral strike-slip fault. Right lateral faults are also known as right-slip, right-handed or dextral strike-slip faults. Faults with left-handed displacement are referred to with similar nomenclature. However, left-handed faults are sinistral, as opposed to dextral or right-handed faults.

(Абрамова Р.Н., Квеско Н.Г., Introduction to Continuum Mechanics- учебное пособие, Томск, ТПУ. 2005.)

Fig. 51. Three types of fault motion

3.1.3 Exercises

1. Match the English term with the Russian variant. (text: Fault terminology)

1. fault

a. сдвиг

2. normal fault

b. простирание

3. reverse fault

c. висячий блок

4. throw

d. косой, наклонный

5. heave

e. сброс

6. hanging wall

f. наклон, падение

7. footwall

g. взброс

8. dip

h. горизонтальная амплитуда смещения

9. strike

i. лежачий блок

10. strike-slip fault

j. вертикальная амплитуда смещения

11. oblique

k. разлом, разрыв

2. Re-read the text “Fault terminology”. Look at the diagram (anatomy of a fault). Label the letters and give an explanation. (R.P – 8.3.1.2)

3. Match the term with its definition and then find its translation.

1. fault

move downward relative to the other side

сброс

2. upthrow

vertical shift

горизонтальная амплитуда смещения

3. downthrow

lateral shift

висячий блок

4. hade

move upward relative to the other side

дизъюнктивное нарушение

5. heave

inclination to vertical plane

вертикальная амплитуда смещения

6. throw

rock mass below the fault plane

отклонение от вертикали

7. footwall

rock mass above the fault plane

лежачий блок

8. hanging wall

fracture along which the opposite sides are displaced

взброс

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