Normal Fault Hanging Wall Moves

A n fault forms when the hanging wall moves down relative to the footwall a.

Normal fault hanging wall moves.

Reverse faults form when the hanging wall moves up. In a normal fault the hanging wall moves downward relative to the footwall. Normal fault a type of fault in which the hanging wall moves down relative to the footwall and the fault surface dips steeply commonly from 50 o to 90 o. A downthrown block between two normal faults dipping towards each other is a graben.

An upthrown block between two normal faults dipping away from each other is a horst. In a strike slip fault a the hanging wall moves down relative to the footwall b the hanging wall moves up relative to the footwall at the angle of 30 degrees or less c the hanging wall moves up relative to the footwall at an angle of 45 degrees or more d the fault blocks move horizontally in opposite directions. In fault normal dip slip faults are produced by vertical compression as earth s crust lengthens. The oldest sedimentary rock strata are exposed along the axial parts of deeply eroded anticlines.

The forces creating reverse faults are compressional pushing the sides together. The hanging wall moves down relative to the foot wall. Special type of reverse fault that is nearly horizontal angle has less than 45 degrees strike slip fault. Normal fault s are common.

They bound many of the mountain ranges of the world and many of the rift valleys found along spreading margins. Formed by compressional stress rocks are pushed towards each other thrust fault. Normal fractures in rock with no offset where there has been no motion are called. Low angle normal faults with regional tectonic significance may be designated detachment faults.

Together normal and reverse faults are called dip slip faults because the movement on them occurs along the dip direction either down or up respectively. Normal faults form in response to horizontal tensional stresses that stretch or elongate the rocks. In a reverse fault the hanging wall block moves up relative to the footwall block. The hanging wall slides down relative to the footwall.