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Dip and strike are a method of describing the orientation of a plane in three dimensional space. It is usually applied to the orientation of tilted layers of rock.
Dip is the angle of tilt, measured from the horizontal. Think of the direction of dip as the direction that a ball would roll if placed on the surface. The angle of dip is measured in degrees.
Strike is the direction of a level line on that tilted surface. It is more difficult to visualize, but easy to remember because it is always perpendicular to the direction of dip.
To visualize use a book. Prop up one end on another book. Then examine the surface of the book. If you have a marble place it on the book and watch it roll down the dip.
To see the strike kneel down and look at the book from the side so that you see either the binding or the pages. Now take a ruler and try to lay it on the book so that the marble will not roll along the edge of the ruler. When you have done that you will have found the strike, and it will be perpendicular to the dip.
The strike is easy to find if you have a carpenter's level (of course, everyone has one of those lying around).
Submitted by R. Brill, Professor of Natural Science, Honolulu Community College
What else can I help you with?
What is up dip direction?
"Up dip" direction refers to the direction in which rock layers incline or tilt relative to the horizontal plane. It indicates the direction where the rocks are sloping towards when looking perpendicular to the strike of the rock layers. This term is commonly used in geology to describe the orientation of rock strata.
In geology what are strikes and dips associated with?
Strikes and dips are associated with the orientation of rock layers. The strike is the compass direction of a horizontal line on the rock surface, while the dip is the angle of inclination of the rock layer from the horizontal plane. They are fundamental in understanding the structural geology of rock formations.
What is the main difference between a dip slip fault and a strike slip fault?
The main difference between a dip-slip fault and a strike-slip fault is the direction of movement. In a dip-slip fault, the movement is primarily vertical along the dip direction of the fault plane, either up or down. In a strike-slip fault, the movement is primarily horizontal along the strike direction of the fault plane, either to the left or right.
How can one determine the strike and dip on a geologic map?
To determine the strike and dip on a geologic map, look for the orientation of rock layers. The strike is the compass direction of a horizontal line on the rock layer, while the dip is the angle of the rock layer's slope from the horizontal. These can be found by examining the symbols and markings on the map that indicate the orientation of the rock layers.
What is right hand rule in geology?
There are two different right hand rules...American right hand rule: Looking to the strike direction, the bed dips to the right. In our example, that would fit with 000/45. So, looking to the north, the bed dips to the right, to 090 (east).British right hand rule: The thumb of the right hand indicates the dip direction, and the heal points to the strike direction. So in our example, we would record the orientation as 180/45. That is: Strike towards 180 (perfect south bearing), and dip of 45º towards 090.
Difference of physical geology from historica geology?
Physical geology focuses on the physical aspects of rocks, minerals, deposits, faults (strike, dip), etc..."This fault has a strike of 42 deg NW, and a dip of 12 degrees...) Historical geology uses the above information to establish a timeline of geological events in an area..."This fault occurred after the formation of these sedimentary strata...."
How do you find strike dip and dip direction on a contour map?
To find strike and dip on a contour map, locate a layer boundary that is perpendicular to the strike. The dip direction is the direction that the layers are dipping towards. The dip is the angle at which the layers are inclined from the horizontal.
Is there any detailed explanation on angle of dip in physics?
Yes,angle of dip,or angle of inclination is the angle that a compass arrow direction or an axis of magnetic needle makes with plane of the horizon. Strike and dip are the terms of Geophysics and Geology applied them to determine the coordinates of the location of any geological object.
What is up dip direction?
"Up dip" direction refers to the direction in which rock layers incline or tilt relative to the horizontal plane. It indicates the direction where the rocks are sloping towards when looking perpendicular to the strike of the rock layers. This term is commonly used in geology to describe the orientation of rock strata.
In geology what are strikes and dips associated with?
Strikes and dips are associated with the orientation of rock layers. The strike is the compass direction of a horizontal line on the rock surface, while the dip is the angle of inclination of the rock layer from the horizontal plane. They are fundamental in understanding the structural geology of rock formations.
How is a dip-slip fault different from a strike-slip fault?
Dip-Slip fault is a bedding fault and its pattern is En-Echelon, while Strike Slip fault is strike fault and its pattern is Parallel.
What does a strike and dip symbol mean?
don't askme
What is the main difference between a dip slip fault and a strike slip fault?
The main difference between a dip-slip fault and a strike-slip fault is the direction of movement. In a dip-slip fault, the movement is primarily vertical along the dip direction of the fault plane, either up or down. In a strike-slip fault, the movement is primarily horizontal along the strike direction of the fault plane, either to the left or right.
Explain in your own words the strike and dip of a rock unit?
The strike of a rock unit is the compass direction of a horizontal line on the rock surface, while the dip is the angle at which the rock unit is inclined from the horizontal plane. Together, strike and dip describe the orientation and slope of rock layers in relation to the Earth's surface.
How can one determine the strike and dip on a geologic map?
To determine the strike and dip on a geologic map, look for the orientation of rock layers. The strike is the compass direction of a horizontal line on the rock layer, while the dip is the angle of the rock layer's slope from the horizontal. These can be found by examining the symbols and markings on the map that indicate the orientation of the rock layers.
Is the San Andreas Fault a dip-slip fault?
No. It is a strike-slip fault.
How do you measure dip and strike using brundon compass?
The layers of rock (strata) we see on the Earth's surface are rarely found in their original flat orientation. Measuring dip and strike is pretty easy, all you need is a compass for the level direction, and a clinometer to measure the vertical angle. For basic dip measurements I use an angle finder from a hardware store costing a couple of pounds (about 3-4 dollars US). I expect your tutor will expect you to sing the praises of the expensive "Brunton" combined compass and clinometer. (I don't know why, I have never found the point of spending huge amounts of money on this - but they remain a venerated item min American geology) Why bother? Measuring dip and strike is a fundamental part of geological mapping as you can build up a picture of the tilting and folding of the rocks beneath the surface, and start to build up a three dimensional model of the geology from the two-dimensional information at the surface. This is useful in predicting such things as the location and depth of an underground coal seam, or of working out the geological history of an area. If you cannot measure dip and strike directly, by measuring it off the surface of an exposed outcrop, then you can calculate it by measuring the height and direction an outcrop of the same strata run on opposite sides of a hill or valley, and doing some trigonometry.
