Find rake stereonet pdf

This is a printable 2 degree equal angle wulff stereonet in pdf format. The main forms of data visualization in dips are the various plot options available in the view menu and view toolbar pole plots. A users manual for stereonet 9 is available within the lab materials folder at the geol305 sakai site. One of its most important uses was the representation of celestial charts. Return the overlay to its original orientation and count off the trend. How to use a stereonet to find the trend and plunge of a line plotted as a dot. Now you can find the great circle with the same dip 40 as the layer by counting 40 from the primitive circle along the 90 270 diameter. Innstereo is a stereographic projection program or stereonet program for structural geology. In trying to document the character of structural elements it is not uncommon to have hundreds of orientation readings. Structural geology laboratory manual third edition table of contents laboratory 1.

The stereonet forms the surface of this lower hemisphere. Stereographic projection the basics geological digressions. Stereographic projection is a method used in crystallography and structural geology to depict the angular relationships between crystal faces and geologic structures, respectively. On a transparent overlay, mark the positions of the ns and ew axes, and the stereonet centre. Slickenlines on a fault plane represent the direction of some relative displacement between the two blocks separated by the fault. This video is a tutorial on plotting and reading rake or pitch on a stereonet. Trend orientation of horizontal component measured from north plunge inclination downward from horizontal planes strike and dip quadrant notation 360 notation pole line normal to plane measured down lower hemisphere dip. Tony obrien says this is the one for you following on from chord electronics recent fullsize announcements of its ultima pre 2 and new ultima 5 and 6. The stereographic projection was known to hipparchus, ptolemy and probably earlier to the egyptians. So, to find the orientation of lines plotted on a stereonet projection. Draw a line representing the strike line of the plane. You can assume that the fault has a negligible rotational component of rigid body deformation. Gy360 structural geology net slip problem introduction with the attached figure and the data provided below, solve for the net slip vector for the fault which displaces dikes a and b on the map.

The threedimensional orientation of a line can be described with just a plunge and trend. Stereonet plotting reference sheet prepare to plot. Determing the strike and dip of a plane from a stereonet 1 rotate the tracing paper such that the two ends of the great circle that. It was originally known as the planisphere projection.

Rake is a program that is used to examine the stress regime in a region, using information from an earthquake database. Pdf optional folds and stereonet practical chris wild. This arc is projected back up on to the stereonet to form a great circle figure 1b. Planisphaerium by ptolemy is the oldest surviving document that describes it. The rake angle is measured from a specific end of the strike line so that end must be recorded with the rake angle ex. Attitude measurements, true and apparent dips, and threepoint problems. The orientation of a plane is represented by imagining the plane to pass through the centre of a sphere fig. Find the trend and plunge of a line plotted on a stereonet. Looking from above, where the plane touches the edge of the lower hemisphere is an arc. Rake angle is a parameter used in various cutting and machining processes, describing the angle of the cutting face relative to the work.

Introduction stereographic projection is a powerful method for solving geometric problems in structural geology. Checksums for the binaries are at the bottom of the page. In structural geology, rake or pitch is formally defined as the angle between a line or a feature and the strike line of the plane in which it is found, measured on the plane. Extract the downloaded archive to any folder on your compu. Watch jr define the term rake and plot a line that rakes in a plane. Project a slickenline lineation to that plane having a plunge of 43 e. This will be a straight line across the center of the stereonet intersecting the outer circle at the strike bearing. A tool has a positive rake when the face of the cutting tool slopes away from the cutting edge at inner side. This lab will give you practical experience using stereonets to plot your structural. Plotting a plane using the stereonet next, rotate the transparency so the strike is at 0. Here we discuss the method used in crystallography, but it. We collected a bunch of planar data from the limbs of a fold. Notice how the lineation plots on the great circle of the. A pole plot is the most basic representation of the orientation data.

Retrieving orientations from data on a stereonet if you are given a stereonet with data already plotted on it, you can retrieve the exact orientations of lines and planes by following the procedures outlined above, except in reverse. Workbook 2 stereonets school of earth and environment. Draw great circle projection of a fault plane with strike n. Stereographic projection is about representing planar and linear features in a twodimensional diagram. Rake is the direction a hanging wall block moves during rupture, as measured on the plane of the fault. Rake is simply the angle between the strike direction and the lineation trend. Rotate the plotted point to one of the vertical great circles it does not matter which one. An online stereonet program that allows you to create and view all of your geologic stereonet information in 3d. In the example, the line was originally measured and plotted as a rake. Imagine a plane cutting through the centre of a lower hemisphere figure 1a.

Dotproc geoscientific analysis software dotproc software is designed to help geoscientists in the analysis of twodimentional 2d spatial data sets in a highly visual manner. In fact, the stereonet is usually the tool of choice for solving these problems because of its speed. Visible geology runs in the browser so there is no need to download anything, just click to add lines and double click to add planes. Create any type of planar geologic fault, as well as faultbendfolds and blindthrust faults. Small circles angles are slightly distorted and make the circles appear as ellipses. To find the trend, rotate the tracing paper back to normal, being careful not to lose track of the tick mark you just made.

Given strike and one apparent dip find the true dip angle. To find the trend, rotate the tracing paper back to normal, being careful not to lose track of the tick mark you just make. Rakes the stereonet program supports rakes through the input of a plane and an orientation rake in that plane. The orientation is converted automatically to a line with a trend and plunge, but still remains veiwable as a rake. To illustrate, we will find the true dip and strike of a plane for which we have measured two apparent dips. Tractor parts and replacement reasonable prices of john deere hay rake and other similar listings. John deere hay rake for sale tractor parts and replacement. The rake is a useful description of a line because often in geology features lines follow along a planar surface. Installing the application there is no installer provided. However, it is extremely useful, as orientation problems are. Shogun method ebook free pdf download yes download now.

Solution using a stereonet proceed as follows see figures 3 and 4. The term planisphere is still used to refer to such charts. Software for stereographic projection there are several pieces of software that youd like to check out for that purposes. Trying to interpret such data plotted as raw orientations scatter plots on a stereonet, without further data treatment is difficult and susceptible to. Unlike structure contouring and other mapbased techniques, it preserves only the orientation of lines and planes with no ability to preserve position relationships. Pitch angles are in the range 090 o, with a pitch of 0 o being a line parallel to the strike, and a pitch of 90 o being a line parallel to the dip line. Featuring john deere hay rake available for buying today online. Structural geology laboratory university of south alabama.

The intercepts are projected onto a plan and labelled with the height of each intersection above a common datum. Given two apparent dips solve for strike and true dip. How to plot the rake of a line, given the strike and dip of a plane and the angle rake between the measured strike and the line. The line of intersection between the plane and the sphere will then represent a circle, and this circle is formally known as a. Count in along the great circle to find the plunge. Other common uses for stereonets calculating rake we use rake to describe the angle between a plane and lineations on that plane. On a pole plot, points are plotted on a stereonet that correspond to the orientation of either 1 linear features or 2 poles representing planes. Angle measured from the origination point of the great circle on the primitive circle. Releases innstereo is under development, but beta releases are already quite usable. Fault data include both the fault plane and slicken line orientations, the latter including the. Stereonet practice problems do them first, then check solution on p. The software is for free and it is an excel spreadsheet that can be used in both pc and macintosh platforms. Stereonet analysis of data from arbuckle mountains near.