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• Rehman Abbasi

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Introduction To Strike, Dip & Dip Direction

Engr. Sultan Ahmed Khoso

Introduction • Strike, dip & dip direction, refer to the orientation or attitude of a geologic feature, mainly used

during the geological mapping of an area.

• Strike is the direction of a line produced by the intersection of an imaginary horizontal plane with an inclined bed. When two planes intersect a line is formed. If one plane is the inclined rock layer and

the other is a horizontal plane, representing the surface of the Earth the direction of, a line formed by their intersection is called the strike of that unit or that feature. • Dip is the angle between the imaginary horizontal plane and the inclined bed, measured in a plane

oriented at 90 degree to the strike line. The dip is the maximum angle of inclination of an inclined plane and is measured perpendicular to the strike.

Strike and Dip

Strike of Beds

Definition of Strike, dip & Dip Direction

Fundamentals of Strike and Dip • Symbols that come upon when studying maps are shown as under: -The longer line of the symbol represents the strike of the feature on the maps ,

-The shorter mark indicates the direction of dip on the maps. - BOTH ARE PERPENDICULAR TO EACH OTHER, - And the small number next to the arrow is the value of the angle of dip

Fundamentals of Strike and Dip • The angle of strike can be ANY value between 0° and 360°, and • The angle of dip can be any value between 0 and 90o

Case Study Example : If Rock layer is oriented at 330° from North to West (i.e. N330oW) and tilted by 10° from North towards East (N10oE), What will be the Orientation of Rock Bed in Geological Map.

Case Study Fig. A

Fig. B

Fig. C

Look at Figs. and Conclude Fig. A

Fig. B

Fig. C